Add screenshots, update metainfo, and fix AppImage build script

- Add 18 screenshots sorted by workflow order to data/screenshots/
- Update metainfo with actual screenshot entries and correct dimensions
- Fix build script to copy all hicolor icon sizes and use linuxdeploy --output
- Add exported icon PNGs to icons/

build-appimage.sh

@@ -0,0 +1,98 @@
+#!/bin/bash
+set -euo pipefail
+
+# Build Pixstrip AppImage
+# Requires: cargo, linuxdeploy (with gtk plugin), appimagetool
+# Usage: ./build-appimage.sh [--release]
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+BUILD_TYPE="release"
+CARGO_FLAGS="--release"
+
+if [[ "${1:-}" == "--debug" ]]; then
+    BUILD_TYPE="debug"
+    CARGO_FLAGS=""
+fi
+
+APP_ID="live.lashman.Pixstrip"
+APP_DIR="$SCRIPT_DIR/AppDir"
+TOOLS_DIR="$SCRIPT_DIR/build-tools"
+
+echo "=== Building Pixstrip AppImage ($BUILD_TYPE) ==="
+
+# Step 1: Build binaries
+echo "--- Building binaries ---"
+cargo build $CARGO_FLAGS --workspace
+
+# Step 2: Create AppDir structure
+echo "--- Creating AppDir ---"
+rm -rf "$APP_DIR"
+mkdir -p "$APP_DIR/usr/bin"
+mkdir -p "$APP_DIR/usr/share/applications"
+mkdir -p "$APP_DIR/usr/share/icons/hicolor/scalable/apps"
+mkdir -p "$APP_DIR/usr/share/metainfo"
+
+# Step 3: Copy binaries
+cp "target/$BUILD_TYPE/pixstrip-gtk" "$APP_DIR/usr/bin/pixstrip-gtk"
+cp "target/$BUILD_TYPE/pixstrip-cli" "$APP_DIR/usr/bin/pixstrip"
+
+# Step 4: Copy desktop file, icons, metainfo
+cp "data/$APP_ID.desktop" "$APP_DIR/usr/share/applications/"
+cp "data/$APP_ID.desktop" "$APP_DIR/"
+cp "data/$APP_ID.metainfo.xml" "$APP_DIR/usr/share/metainfo/"
+
+# Copy all hicolor icon sizes
+for size_dir in data/icons/hicolor/*/apps; do
+    size=$(basename "$(dirname "$size_dir")")
+    mkdir -p "$APP_DIR/usr/share/icons/hicolor/$size/apps"
+    cp "$size_dir"/$APP_ID.* "$APP_DIR/usr/share/icons/hicolor/$size/apps/" 2>/dev/null || true
+done
+
+# Top-level icon for AppImage spec
+cp "data/icons/hicolor/256x256/apps/$APP_ID.png" "$APP_DIR/$APP_ID.png"
+
+# Step 5: Create AppRun
+cat > "$APP_DIR/AppRun" << 'APPRUN'
+#!/bin/bash
+SELF="$(readlink -f "$0")"
+HERE="${SELF%/*}"
+export PATH="${HERE}/usr/bin:${PATH}"
+export LD_LIBRARY_PATH="${HERE}/usr/lib:${HERE}/usr/lib/x86_64-linux-gnu:${LD_LIBRARY_PATH:-}"
+export XDG_DATA_DIRS="${HERE}/usr/share:${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
+export GI_TYPELIB_PATH="${HERE}/usr/lib/x86_64-linux-gnu/girepository-1.0:${GI_TYPELIB_PATH:-}"
+exec "${HERE}/usr/bin/pixstrip-gtk" "$@"
+APPRUN
+chmod +x "$APP_DIR/AppRun"
+
+# Step 6: Bundle shared libraries
+echo "--- Bundling libraries ---"
+mkdir -p "$TOOLS_DIR"
+
+# Download linuxdeploy if not present
+if [[ ! -x "$TOOLS_DIR/linuxdeploy" ]]; then
+    echo "Downloading linuxdeploy..."
+    wget -q -O "$TOOLS_DIR/linuxdeploy" \
+        "https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage"
+    chmod +x "$TOOLS_DIR/linuxdeploy"
+fi
+
+# Download linuxdeploy GTK plugin if not present
+if [[ ! -x "$TOOLS_DIR/linuxdeploy-plugin-gtk.sh" ]]; then
+    echo "Downloading linuxdeploy GTK plugin..."
+    wget -q -O "$TOOLS_DIR/linuxdeploy-plugin-gtk.sh" \
+        "https://raw.githubusercontent.com/linuxdeploy/linuxdeploy-plugin-gtk/master/linuxdeploy-plugin-gtk.sh"
+    chmod +x "$TOOLS_DIR/linuxdeploy-plugin-gtk.sh"
+fi
+
+# Use linuxdeploy to bundle dependencies and create AppImage
+export DEPLOY_GTK_VERSION=4
+"$TOOLS_DIR/linuxdeploy" \
+    --appdir "$APP_DIR" \
+    --desktop-file "$APP_DIR/usr/share/applications/$APP_ID.desktop" \
+    --icon-file "$APP_DIR/usr/share/icons/hicolor/256x256/apps/$APP_ID.png" \
+    --plugin gtk \
+    --output appimage
+
+echo ""
+echo "=== AppImage built ==="
+ls -lh Pixstrip-*.AppImage 2>/dev/null || echo "Note: output filename may vary."

data/icons/hicolor/scalable/apps/live.lashman.Pixstrip.svg

@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" width="128" height="128">
+  <!-- Pixstrip app icon: scissors cutting a film strip / image strip -->
+
+  <!-- Film strip background -->
+  <rect x="16" y="32" width="96" height="64" rx="6" ry="6" fill="#3584e4" opacity="0.9"/>
+
+  <!-- Film strip sprocket holes - top -->
+  <rect x="24" y="36" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="40" y="36" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="56" y="36" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="72" y="36" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="88" y="36" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+
+  <!-- Film strip sprocket holes - bottom -->
+  <rect x="24" y="84" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="40" y="84" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="56" y="84" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="72" y="84" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+  <rect x="88" y="84" width="8" height="8" rx="2" fill="#fff" opacity="0.5"/>
+
+  <!-- Image frames in the strip -->
+  <rect x="24" y="48" width="20" height="32" rx="2" fill="#fff" opacity="0.85"/>
+  <rect x="48" y="48" width="20" height="32" rx="2" fill="#fff" opacity="0.85"/>
+  <rect x="72" y="48" width="20" height="32" rx="2" fill="#fff" opacity="0.85"/>
+
+  <!-- Mini landscape icons inside frames -->
+  <circle cx="30" cy="56" r="3" fill="#77767b" opacity="0.6"/>
+  <polygon points="26,74 34,66 38,70 42,64 44,74" fill="#77767b" opacity="0.4"/>
+
+  <circle cx="54" cy="56" r="3" fill="#77767b" opacity="0.6"/>
+  <polygon points="50,74 58,66 62,70 66,64 68,74" fill="#77767b" opacity="0.4"/>
+
+  <circle cx="78" cy="56" r="3" fill="#77767b" opacity="0.6"/>
+  <polygon points="74,74 82,66 86,70 90,64 92,74" fill="#77767b" opacity="0.4"/>
+
+  <!-- Scissors - cutting diagonally across the strip -->
+  <!-- Scissor blade 1 (top-right) -->
+  <path d="M98,20 L70,58 L74,62 L102,24 Z" fill="#e01b24" opacity="0.9"/>
+  <circle cx="100" cy="18" r="8" fill="none" stroke="#e01b24" stroke-width="3" opacity="0.9"/>
+  <circle cx="100" cy="18" r="3" fill="#e01b24" opacity="0.5"/>
+
+  <!-- Scissor blade 2 (bottom-right) -->
+  <path d="M98,108 L70,70 L74,66 L102,104 Z" fill="#e01b24" opacity="0.9"/>
+  <circle cx="100" cy="110" r="8" fill="none" stroke="#e01b24" stroke-width="3" opacity="0.9"/>
+  <circle cx="100" cy="110" r="3" fill="#e01b24" opacity="0.5"/>
+
+  <!-- Scissor pivot -->
+  <circle cx="74" cy="64" r="3" fill="#a51d2d"/>
+
+  <!-- Cut line (dashed) -->
+  <line x1="74" y1="64" x2="16" y2="64" stroke="#a51d2d" stroke-width="1.5" stroke-dasharray="4,3" opacity="0.7"/>
+</svg>

data/live.lashman.Pixstrip.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Name=Pixstrip
+Comment=Batch image processor - resize, convert, compress, and more
+Exec=pixstrip-gtk %F
+Icon=live.lashman.Pixstrip
+Terminal=false
+Type=Application
+Categories=Graphics;ImageProcessing;GTK;
+MimeType=image/jpeg;image/png;image/webp;image/avif;image/gif;image/tiff;image/bmp;
+Keywords=image;photo;resize;convert;compress;batch;metadata;strip;watermark;rename;
+StartupNotify=true
+SingleMainWindow=true

data/live.lashman.Pixstrip.metainfo.xml

@@ -0,0 +1,192 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>live.lashman.Pixstrip</id>
+  <metadata_license>CC0-1.0</metadata_license>
+  <project_license>CC0-1.0</project_license>
+
+  <name>Pixstrip</name>
+  <summary>Batch image processor - resize, convert, compress, and more</summary>
+
+  <description>
+    <p>
+      Pixstrip is a native GTK4/libadwaita batch image processor for Linux
+      that combines resize, convert, compress, metadata strip, watermark,
+      rename, and image adjustments into a single wizard-driven workflow.
+      It processes everything locally with no cloud dependency.
+    </p>
+    <p>Key features:</p>
+    <ul>
+      <li>Resize images by width, height, fit-in-box, or social media presets</li>
+      <li>Convert between JPEG, PNG, WebP, AVIF, GIF, and TIFF</li>
+      <li>Compress with optimized encoders (mozjpeg, oxipng, libwebp, ravif)</li>
+      <li>Strip or selectively manage EXIF metadata for privacy</li>
+      <li>Add text or image watermarks with positioning and rotation</li>
+      <li>Rename files with templates, counters, regex, and EXIF variables</li>
+      <li>Adjust brightness, contrast, saturation, and apply effects</li>
+      <li>Built-in presets for common workflows with one-click processing</li>
+      <li>Custom workflow builder with step-by-step wizard</li>
+      <li>Watch folders for automatic processing</li>
+      <li>Processing history with undo via system trash</li>
+      <li>Full CLI with feature parity for scripting and automation</li>
+      <li>File manager integration for Nautilus, Nemo, Thunar, and Dolphin</li>
+    </ul>
+  </description>
+
+  <icon type="stock">live.lashman.Pixstrip</icon>
+
+  <launchable type="desktop-id">live.lashman.Pixstrip.desktop</launchable>
+
+  <developer id="live.lashman">
+    <name>lashman</name>
+  </developer>
+
+  <url type="homepage">https://git.lashman.live/lashman/pixstrip</url>
+  <url type="bugtracker">https://git.lashman.live/lashman/pixstrip/issues</url>
+  <url type="vcs-browser">https://git.lashman.live/lashman/pixstrip</url>
+  <url type="donation">https://ko-fi.com/lashman</url>
+  <url type="contact">https://git.lashman.live/lashman/pixstrip/issues</url>
+  <url type="contribute">https://git.lashman.live/lashman/pixstrip</url>
+
+  <update_contact>lashman@robotbrush.com</update_contact>
+
+  <screenshots>
+    <screenshot type="default">
+      <caption>Workflow selection with built-in and user presets for common image tasks</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/01.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Image selection with thumbnail grid and batch file management</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/02.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Resize step with live preview, presets, and dimension controls</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/03.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Format conversion with cards for JPEG, PNG, WebP, AVIF, GIF, TIFF, and BMP</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/04.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Compression with quality slider and live before/after preview</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/05.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Image adjustments for brightness, contrast, saturation, and effects</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/06.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Metadata handling with preset modes and custom category toggles</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/07.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Text watermark placement with live preview on image</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/08.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Batch rename with prefix, suffix, case conversion, and live file preview</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/09.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Output summary with operation checklist, directory, and overwrite settings</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/10.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Processing complete with results showing images processed and space saved</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/11.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Save workflow as a reusable preset with custom name, icon, and color</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/12.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Settings with output defaults, interface options, and file manager integration</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/13.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Processing history with recent batches and space savings</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/14.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Keyboard shortcuts for wizard navigation, file management, and more</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/15.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Welcome screen with quick introduction to Pixstrip</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/16.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Setup wizard to choose between simple and detailed interface modes</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/17.png</image>
+    </screenshot>
+    <screenshot>
+      <caption>Contextual help with detailed guidance for each wizard step</caption>
+      <image type="source" width="1369" height="1081">https://git.lashman.live/lashman/pixstrip/raw/branch/main/data/screenshots/18.png</image>
+    </screenshot>
+  </screenshots>
+
+  <branding>
+    <color type="primary" scheme_preference="light">#57a773</color>
+    <color type="primary" scheme_preference="dark">#263226</color>
+  </branding>
+
+  <categories>
+    <category>Graphics</category>
+    <category>ImageProcessing</category>
+    <category>GTK</category>
+  </categories>
+
+  <keywords>
+    <keyword>Image</keyword>
+    <keyword>Photo</keyword>
+    <keyword>Resize</keyword>
+    <keyword>Convert</keyword>
+    <keyword>Compress</keyword>
+    <keyword>Batch</keyword>
+    <keyword>Metadata</keyword>
+    <keyword>Watermark</keyword>
+    <keyword>Rename</keyword>
+    <keyword>EXIF</keyword>
+    <keyword>WebP</keyword>
+    <keyword>AVIF</keyword>
+  </keywords>
+
+  <content_rating type="oars-1.1" />
+
+  <requires>
+    <display_length compare="ge">360</display_length>
+  </requires>
+
+  <recommends>
+    <control>keyboard</control>
+    <control>pointing</control>
+  </recommends>
+
+  <supports>
+    <control>pointing</control>
+    <control>keyboard</control>
+    <control>touch</control>
+  </supports>
+
+  <provides>
+    <binary>pixstrip-gtk</binary>
+    <binary>pixstrip</binary>
+  </provides>
+
+  <releases>
+    <release version="0.1.0" date="2026-03-06" type="stable">
+      <description>
+        <p>Initial release of Pixstrip with core features:</p>
+        <ul>
+          <li>Wizard-driven batch processing with 8 built-in presets</li>
+          <li>Resize, convert, compress, metadata strip, watermark, rename, and adjust</li>
+          <li>Optimized encoders: mozjpeg, oxipng, libwebp, and ravif</li>
+          <li>Live compression preview with before/after comparison</li>
+          <li>Watch folders for automatic processing</li>
+          <li>Processing history with undo via system trash</li>
+          <li>Full CLI with feature parity</li>
+          <li>File manager integration for Nautilus, Nemo, Thunar, and Dolphin</li>
+        </ul>
+      </description>
+    </release>
+  </releases>
+</component>

data/nautilus-pixstrip.py

@@ -0,0 +1,112 @@
+"""Nautilus extension for Pixstrip - adds 'Process with Pixstrip' submenu to image context menu."""
+
+import os
+import subprocess
+import json
+
+from gi.repository import Nautilus, GObject
+
+SUPPORTED_MIMETYPES = [
+    "image/jpeg",
+    "image/png",
+    "image/webp",
+    "image/avif",
+    "image/gif",
+    "image/tiff",
+    "image/bmp",
+]
+
+
+def get_presets():
+    """Load built-in and user presets."""
+    presets = [
+        "Blog Photos",
+        "Social Media",
+        "Web Optimization",
+        "Email Friendly",
+        "Privacy Clean",
+        "Photographer Export",
+        "Archive Compress",
+        "Fediverse Ready",
+    ]
+
+    # Load user presets
+    config_dir = os.path.expanduser("~/.config/pixstrip/presets")
+    if os.path.isdir(config_dir):
+        for filename in sorted(os.listdir(config_dir)):
+            if filename.endswith(".json"):
+                filepath = os.path.join(config_dir, filename)
+                try:
+                    with open(filepath) as f:
+                        data = json.load(f)
+                        name = data.get("name", "")
+                        if name and name not in presets:
+                            presets.append(name)
+                except (json.JSONDecodeError, IOError):
+                    pass
+
+    return presets
+
+
+class PixstripMenuProvider(GObject.GObject, Nautilus.MenuProvider):
+    def get_file_items(self, files):
+        # Only show for image files
+        if not files:
+            return []
+
+        for f in files:
+            if f.get_mime_type() not in SUPPORTED_MIMETYPES:
+                return []
+
+        items = []
+
+        # Main menu item
+        top_item = Nautilus.MenuItem(
+            name="PixstripMenuProvider::process",
+            label="Process with Pixstrip",
+            tip="Open images in Pixstrip for batch processing",
+        )
+
+        submenu = Nautilus.Menu()
+        top_item.set_submenu(submenu)
+
+        # Open in Pixstrip
+        open_item = Nautilus.MenuItem(
+            name="PixstripMenuProvider::open",
+            label="Open in Pixstrip...",
+            tip="Open the Pixstrip wizard with these images",
+        )
+        open_item.connect("activate", self._on_open, files)
+        submenu.append_item(open_item)
+
+        # Separator via disabled item
+        sep = Nautilus.MenuItem(
+            name="PixstripMenuProvider::sep1",
+            label="---",
+            sensitive=False,
+        )
+        submenu.append_item(sep)
+
+        # Preset items
+        for preset in get_presets():
+            safe_name = preset.replace(" ", "_").lower()
+            item = Nautilus.MenuItem(
+                name=f"PixstripMenuProvider::preset_{safe_name}",
+                label=preset,
+                tip=f"Process with {preset} preset",
+            )
+            item.connect("activate", self._on_preset, files, preset)
+            submenu.append_item(item)
+
+        items.append(top_item)
+        return items
+
+    def _on_open(self, menu, files):
+        paths = [f.get_location().get_path() for f in files]
+        subprocess.Popen(["pixstrip-gtk"] + paths)
+
+    def _on_preset(self, menu, files, preset):
+        paths = [f.get_location().get_path() for f in files]
+        subprocess.Popen(
+            ["pixstrip-cli", "process"] + paths + ["--preset", preset]
+        )

pixstrip-cli/Cargo.toml

@@ -7,3 +7,6 @@ license.workspace = true
 [dependencies]
 pixstrip-core = { workspace = true }
 clap = { version = "4", features = ["derive"] }
+trash = "5"
+dirs = "6"
+serde_json = "1"

pixstrip-core/Cargo.toml

@@ -8,3 +8,20 @@ license.workspace = true
 serde = { workspace = true }
 serde_json = { workspace = true }
 thiserror = { workspace = true }
+magick_rust = "1"
+fast_image_resize = "5"
+image = "0.25"
+rayon = "1"
+walkdir = "2"
+mozjpeg = "0.10"
+oxipng = "10"
+webp = "0.3"
+little_exif = "0.4"
+imageproc = "0.25"
+ab_glyph = "0.2"
+dirs = "6"
+notify = "7"
+regex = "1"
+
+[dev-dependencies]
+tempfile = "3"

pixstrip-core/src/config.rs

@@ -1 +1,83 @@
-// Application configuration
+use serde::{Deserialize, Serialize};
+
+use crate::watcher::WatchFolder;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct AppConfig {
+    pub first_run_complete: bool,
+    pub tutorial_complete: bool,
+    pub output_subfolder: String,
+    pub output_fixed_path: Option<String>,
+    pub overwrite_behavior: OverwriteBehavior,
+    pub remember_settings: bool,
+    pub skill_level: SkillLevel,
+    pub thread_count: ThreadCount,
+    pub error_behavior: ErrorBehavior,
+    pub notify_on_completion: bool,
+    pub play_completion_sound: bool,
+    pub auto_open_output: bool,
+    pub high_contrast: bool,
+    pub large_text: bool,
+    pub reduced_motion: bool,
+    pub history_max_entries: usize,
+    pub history_max_days: u32,
+    pub watch_folders: Vec<WatchFolder>,
+}
+
+impl Default for AppConfig {
+    fn default() -> Self {
+        Self {
+            first_run_complete: false,
+            tutorial_complete: false,
+            output_subfolder: "processed".into(),
+            output_fixed_path: None,
+            overwrite_behavior: OverwriteBehavior::Ask,
+            remember_settings: true,
+            skill_level: SkillLevel::Simple,
+            thread_count: ThreadCount::Auto,
+            error_behavior: ErrorBehavior::SkipAndContinue,
+            notify_on_completion: true,
+            play_completion_sound: false,
+            auto_open_output: false,
+            high_contrast: false,
+            large_text: false,
+            reduced_motion: false,
+            history_max_entries: 50,
+            history_max_days: 30,
+            watch_folders: Vec::new(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum OverwriteBehavior {
+    Ask,
+    AutoRename,
+    Overwrite,
+    Skip,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum SkillLevel {
+    Simple,
+    Detailed,
+}
+
+impl SkillLevel {
+    pub fn is_advanced(&self) -> bool {
+        matches!(self, Self::Detailed)
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum ThreadCount {
+    Auto,
+    Manual(usize),
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum ErrorBehavior {
+    SkipAndContinue,
+    PauseOnError,
+}

pixstrip-core/src/discovery.rs

@@ -0,0 +1,56 @@
+use std::path::{Path, PathBuf};
+
+use walkdir::WalkDir;
+
+pub const IMAGE_EXTENSIONS: &[&str] = &[
+    "jpg", "jpeg", "png", "webp", "avif", "gif", "tiff", "tif", "bmp",
+];
+
+pub fn is_image_extension(ext: &str) -> bool {
+    IMAGE_EXTENSIONS.contains(&ext.to_lowercase().as_str())
+}
+
+pub fn discover_images(path: &Path, recursive: bool) -> Vec<PathBuf> {
+    if path.is_file() {
+        if let Some(ext) = path.extension().and_then(|e| e.to_str())
+            && is_image_extension(ext)
+        {
+            return vec![path.to_path_buf()];
+        }
+        return Vec::new();
+    }
+
+    if !path.is_dir() {
+        return Vec::new();
+    }
+
+    let max_depth = if recursive { usize::MAX } else { 1 };
+
+    WalkDir::new(path)
+        .max_depth(max_depth)
+        .into_iter()
+        .filter_map(|entry| entry.ok())
+        .filter(|entry| entry.file_type().is_file())
+        .filter(|entry| {
+            entry
+                .path()
+                .extension()
+                .and_then(|ext| ext.to_str())
+                .is_some_and(is_image_extension)
+        })
+        .map(|entry| entry.into_path())
+        .collect()
+}
+
+pub fn has_subdirectories(path: &Path) -> bool {
+    if !path.is_dir() {
+        return false;
+    }
+    std::fs::read_dir(path)
+        .map(|entries| {
+            entries
+                .filter_map(|e| e.ok())
+                .any(|e| e.file_type().is_ok_and(|ft| ft.is_dir()))
+        })
+        .unwrap_or(false)
+}

pixstrip-core/src/encoder.rs

@@ -0,0 +1,303 @@
+use std::io::Cursor;
+use std::path::Path;
+
+use crate::error::{PixstripError, Result};
+use crate::types::{ImageFormat, QualityPreset};
+
+#[derive(Debug, Clone, Default)]
+pub struct EncoderOptions {
+    pub progressive_jpeg: bool,
+    pub avif_speed: u8,
+    /// Output DPI (0 means don't set / use default)
+    pub output_dpi: u32,
+}
+
+pub struct OutputEncoder {
+    pub options: EncoderOptions,
+}
+
+impl OutputEncoder {
+    pub fn new() -> Self {
+        Self {
+            options: EncoderOptions {
+                progressive_jpeg: false,
+                avif_speed: 6,
+                output_dpi: 0,
+            },
+        }
+    }
+
+    pub fn with_options(options: EncoderOptions) -> Self {
+        Self { options }
+    }
+
+    pub fn encode(
+        &self,
+        img: &image::DynamicImage,
+        format: ImageFormat,
+        quality: Option<u8>,
+    ) -> Result<Vec<u8>> {
+        match format {
+            ImageFormat::Jpeg => self.encode_jpeg(img, quality.unwrap_or(85)),
+            ImageFormat::Png => self.encode_png(img, quality.unwrap_or(3)),
+            ImageFormat::WebP => self.encode_webp(img, quality.unwrap_or(85)),
+            ImageFormat::Avif => self.encode_avif(img, quality.unwrap_or(63)),
+            ImageFormat::Gif => self.encode_fallback(img, image::ImageFormat::Gif),
+            ImageFormat::Tiff => self.encode_fallback(img, image::ImageFormat::Tiff),
+            ImageFormat::Bmp => self.encode_fallback(img, image::ImageFormat::Bmp),
+        }
+    }
+
+    pub fn encode_to_file(
+        &self,
+        img: &image::DynamicImage,
+        path: &Path,
+        format: ImageFormat,
+        quality: Option<u8>,
+    ) -> Result<()> {
+        let bytes = self.encode(img, format, quality)?;
+        if let Some(parent) = path.parent() {
+            std::fs::create_dir_all(parent).map_err(PixstripError::Io)?;
+        }
+        std::fs::write(path, &bytes).map_err(PixstripError::Io)?;
+        Ok(())
+    }
+
+    pub fn quality_for_format(&self, format: ImageFormat, preset: &QualityPreset) -> u8 {
+        match format {
+            ImageFormat::Jpeg => preset.jpeg_quality(),
+            ImageFormat::WebP => preset.webp_quality() as u8,
+            ImageFormat::Avif => preset.avif_quality() as u8,
+            ImageFormat::Png => preset.png_level(),
+            ImageFormat::Gif | ImageFormat::Tiff | ImageFormat::Bmp => preset.jpeg_quality(),
+        }
+    }
+
+    fn encode_jpeg(&self, img: &image::DynamicImage, quality: u8) -> Result<Vec<u8>> {
+        let rgb = img.to_rgb8();
+        let (width, height) = (rgb.width() as usize, rgb.height() as usize);
+        let pixels = rgb.as_raw();
+
+        let mut comp = mozjpeg::Compress::new(mozjpeg::ColorSpace::JCS_RGB);
+        comp.set_size(width, height);
+        comp.set_quality(quality as f32);
+        if self.options.progressive_jpeg {
+            comp.set_progressive_mode();
+        }
+        if self.options.output_dpi > 0 {
+            comp.set_pixel_density(mozjpeg::PixelDensity {
+                unit: mozjpeg::PixelDensityUnit::Inches,
+                x: self.options.output_dpi.min(65535) as u16,
+                y: self.options.output_dpi.min(65535) as u16,
+            });
+        }
+
+        let mut output = Vec::new();
+        let mut started = comp.start_compress(&mut output).map_err(|e| PixstripError::Processing {
+            operation: "jpeg_encode".into(),
+            reason: e.to_string(),
+        })?;
+
+        let row_stride = width * 3;
+        for y in 0..height {
+            let start = y * row_stride;
+            let end = start + row_stride;
+            started.write_scanlines(&pixels[start..end]).map_err(|e| PixstripError::Processing {
+                operation: "jpeg_scanline".into(),
+                reason: e.to_string(),
+            })?;
+        }
+
+        started.finish().map_err(|e| PixstripError::Processing {
+            operation: "jpeg_encode".into(),
+            reason: e.to_string(),
+        })?;
+
+        Ok(output)
+    }
+
+    fn encode_png(&self, img: &image::DynamicImage, level: u8) -> Result<Vec<u8>> {
+        let mut buf = Vec::new();
+        let cursor = Cursor::new(&mut buf);
+        let rgba = img.to_rgba8();
+        let encoder = image::codecs::png::PngEncoder::new(cursor);
+        image::ImageEncoder::write_image(
+            encoder,
+            rgba.as_raw(),
+            rgba.width(),
+            rgba.height(),
+            image::ExtendedColorType::Rgba8,
+        )
+        .map_err(|e| PixstripError::Processing {
+            operation: "png_encode".into(),
+            reason: e.to_string(),
+        })?;
+
+        // Insert pHYs chunk for DPI if requested (before oxipng, which preserves it)
+        if self.options.output_dpi > 0 {
+            buf = insert_png_phys_chunk(&buf, self.options.output_dpi);
+        }
+
+        let mut opts = oxipng::Options::default();
+        opts.optimize_alpha = true;
+        opts.deflater = oxipng::Deflater::Libdeflater { compression: level.clamp(1, 12) };
+
+        let optimized = oxipng::optimize_from_memory(&buf, &opts)
+            .map_err(|e| PixstripError::Processing {
+                operation: "png_optimize".into(),
+                reason: e.to_string(),
+            })?;
+
+        Ok(optimized)
+    }
+
+    fn encode_webp(&self, img: &image::DynamicImage, quality: u8) -> Result<Vec<u8>> {
+        let encoder = webp::Encoder::from_image(img).map_err(|e| PixstripError::Processing {
+            operation: "webp_encode".into(),
+            reason: e.to_string(),
+        })?;
+        let mem = encoder.encode(quality as f32);
+        Ok(mem.to_vec())
+    }
+
+    fn encode_avif(&self, img: &image::DynamicImage, quality: u8) -> Result<Vec<u8>> {
+        let mut buf = Vec::new();
+        let cursor = Cursor::new(&mut buf);
+        let rgba = img.to_rgba8();
+        let speed = self.options.avif_speed.clamp(0, 10);
+        let encoder = image::codecs::avif::AvifEncoder::new_with_speed_quality(
+            cursor,
+            speed,
+            quality,
+        );
+        image::ImageEncoder::write_image(
+            encoder,
+            rgba.as_raw(),
+            rgba.width(),
+            rgba.height(),
+            image::ExtendedColorType::Rgba8,
+        )
+        .map_err(|e| PixstripError::Processing {
+            operation: "avif_encode".into(),
+            reason: e.to_string(),
+        })?;
+        Ok(buf)
+    }
+
+    fn encode_fallback(
+        &self,
+        img: &image::DynamicImage,
+        format: image::ImageFormat,
+    ) -> Result<Vec<u8>> {
+        let mut buf = Vec::new();
+        let cursor = Cursor::new(&mut buf);
+        img.write_to(cursor, format).map_err(|e| PixstripError::Processing {
+            operation: "encode".into(),
+            reason: e.to_string(),
+        })?;
+        Ok(buf)
+    }
+}
+
+/// Insert a pHYs chunk into PNG data to set DPI.
+/// The pHYs chunk must appear before the first IDAT chunk.
+/// DPI is converted to pixels per meter (1 inch = 0.0254 meters).
+fn insert_png_phys_chunk(png_data: &[u8], dpi: u32) -> Vec<u8> {
+    // Not a valid PNG (too short for signature) - return as-is
+    if png_data.len() < 8 {
+        return png_data.to_vec();
+    }
+
+    // PNG pixels per meter = DPI / 0.0254
+    let ppm = (dpi as f64 / 0.0254).round() as u32;
+
+    // Build the pHYs chunk:
+    // 4 bytes: data length (9)
+    // 4 bytes: chunk type "pHYs"
+    // 4 bytes: pixels per unit X
+    // 4 bytes: pixels per unit Y
+    // 1 byte: unit (1 = meter)
+    // 4 bytes: CRC32 of type + data
+    let mut chunk_data = Vec::with_capacity(9);
+    chunk_data.extend_from_slice(&ppm.to_be_bytes()); // X pixels per unit
+    chunk_data.extend_from_slice(&ppm.to_be_bytes()); // Y pixels per unit
+    chunk_data.push(1); // unit = meter
+
+    let mut crc_input = Vec::with_capacity(13);
+    crc_input.extend_from_slice(b"pHYs");
+    crc_input.extend_from_slice(&chunk_data);
+
+    let crc = crc32_png(&crc_input);
+
+    let mut phys_chunk = Vec::with_capacity(21);
+    phys_chunk.extend_from_slice(&9u32.to_be_bytes()); // length
+    phys_chunk.extend_from_slice(b"pHYs");             // type
+    phys_chunk.extend_from_slice(&chunk_data);          // data
+    phys_chunk.extend_from_slice(&crc.to_be_bytes());   // CRC
+
+    // Find the first IDAT chunk and insert pHYs before it.
+    // PNG structure: 8-byte signature, then chunks (each: 4 len + 4 type + data + 4 crc)
+    let mut result = Vec::with_capacity(png_data.len() + phys_chunk.len());
+    let mut pos = 8; // skip PNG signature
+    let mut phys_inserted = false;
+    result.extend_from_slice(&png_data[..8]);
+
+    while pos + 8 <= png_data.len() {
+        let chunk_len = u32::from_be_bytes([
+            png_data[pos], png_data[pos + 1], png_data[pos + 2], png_data[pos + 3],
+        ]) as usize;
+        let chunk_type = &png_data[pos + 4..pos + 8];
+        // Use checked arithmetic to prevent overflow on malformed PNGs
+        let Some(total_chunk_size) = chunk_len.checked_add(12) else {
+            break; // chunk_len so large it overflows - malformed PNG
+        };
+
+        if pos.checked_add(total_chunk_size).map_or(true, |end| end > png_data.len()) {
+            break;
+        }
+
+        // Skip any existing pHYs (we're replacing it)
+        if chunk_type == b"pHYs" {
+            pos += total_chunk_size;
+            continue;
+        }
+
+        // Insert our pHYs before the first IDAT
+        if chunk_type == b"IDAT" && !phys_inserted {
+            result.extend_from_slice(&phys_chunk);
+            phys_inserted = true;
+        }
+
+        result.extend_from_slice(&png_data[pos..pos + total_chunk_size]);
+        pos += total_chunk_size;
+    }
+
+    // Copy any remaining bytes (e.g. trailing data after a truncated chunk)
+    if pos < png_data.len() {
+        result.extend_from_slice(&png_data[pos..]);
+    }
+
+    result
+}
+
+/// Simple CRC32 for PNG chunks (uses the standard PNG CRC polynomial)
+fn crc32_png(data: &[u8]) -> u32 {
+    let mut crc: u32 = 0xFFFF_FFFF;
+    for &byte in data {
+        crc ^= byte as u32;
+        for _ in 0..8 {
+            if crc & 1 != 0 {
+                crc = (crc >> 1) ^ 0xEDB8_8320;
+            } else {
+                crc >>= 1;
+            }
+        }
+    }
+    crc ^ 0xFFFF_FFFF
+}
+
+impl Default for OutputEncoder {
+    fn default() -> Self {
+        Self::new()
+    }
+}

pixstrip-core/src/executor.rs

@@ -0,0 +1,828 @@
+use std::sync::atomic::{AtomicBool, AtomicU64, AtomicUsize, Ordering};
+use std::sync::{Arc, Mutex};
+use std::time::Instant;
+
+use rayon::prelude::*;
+
+use crate::encoder::{EncoderOptions, OutputEncoder};
+use crate::error::{PixstripError, Result};
+use crate::loader::ImageLoader;
+use crate::operations::adjustments::apply_adjustments;
+use crate::operations::resize::resize_image_with_algorithm;
+use crate::operations::watermark::apply_watermark;
+use crate::operations::{Flip, Rotation};
+use crate::pipeline::ProcessingJob;
+use crate::types::ImageFormat;
+
+#[derive(Debug, Clone)]
+pub struct ProgressUpdate {
+    pub current: usize,
+    pub total: usize,
+    pub current_file: String,
+    pub succeeded_so_far: usize,
+    pub failed_so_far: usize,
+}
+
+#[derive(Debug, Clone)]
+pub struct BatchResult {
+    pub total: usize,
+    pub succeeded: usize,
+    pub failed: usize,
+    pub cancelled: bool,
+    pub total_input_bytes: u64,
+    pub total_output_bytes: u64,
+    pub errors: Vec<(String, String)>,
+    pub elapsed_ms: u64,
+    /// Actual output file paths written by the executor (only successfully written files).
+    pub output_files: Vec<String>,
+}
+
+pub struct PipelineExecutor {
+    cancel_flag: Arc<AtomicBool>,
+    pause_flag: Arc<AtomicBool>,
+    thread_count: usize,
+    pause_on_error: bool,
+}
+
+impl PipelineExecutor {
+    pub fn new() -> Self {
+        Self {
+            cancel_flag: Arc::new(AtomicBool::new(false)),
+            pause_flag: Arc::new(AtomicBool::new(false)),
+            thread_count: num_cpus(),
+            pause_on_error: false,
+        }
+    }
+
+    pub fn with_cancel(cancel_flag: Arc<AtomicBool>) -> Self {
+        Self {
+            cancel_flag,
+            pause_flag: Arc::new(AtomicBool::new(false)),
+            thread_count: num_cpus(),
+            pause_on_error: false,
+        }
+    }
+
+    pub fn with_cancel_and_pause(
+        cancel_flag: Arc<AtomicBool>,
+        pause_flag: Arc<AtomicBool>,
+    ) -> Self {
+        Self {
+            cancel_flag,
+            pause_flag,
+            thread_count: num_cpus(),
+            pause_on_error: false,
+        }
+    }
+
+    pub fn set_thread_count(&mut self, count: usize) {
+        self.thread_count = if count == 0 { num_cpus() } else { count };
+    }
+
+    pub fn set_pause_on_error(&mut self, pause: bool) {
+        self.pause_on_error = pause;
+    }
+
+    pub fn execute<F>(&self, job: &ProcessingJob, mut on_progress: F) -> Result<BatchResult>
+    where
+        F: FnMut(ProgressUpdate) + Send,
+    {
+        let start = Instant::now();
+        let total = job.sources.len();
+
+        if total == 0 {
+            return Ok(BatchResult {
+                total: 0,
+                succeeded: 0,
+                failed: 0,
+                cancelled: false,
+                total_input_bytes: 0,
+                total_output_bytes: 0,
+                errors: Vec::new(),
+                elapsed_ms: 0,
+                output_files: Vec::new(),
+            });
+        }
+
+        // Use single-threaded path when thread_count is 1
+        if self.thread_count <= 1 {
+            return self.execute_sequential(job, on_progress);
+        }
+
+        // Build a scoped rayon thread pool with the configured count
+        let pool = rayon::ThreadPoolBuilder::new()
+            .num_threads(self.thread_count)
+            .build()
+            .map_err(|e| PixstripError::Processing {
+                operation: "thread_pool".into(),
+                reason: e.to_string(),
+            })?;
+
+        let completed = AtomicUsize::new(0);
+        let succeeded_count = AtomicUsize::new(0);
+        let failed_count = AtomicUsize::new(0);
+        let input_bytes = AtomicU64::new(0);
+        let output_bytes = AtomicU64::new(0);
+        let cancelled = AtomicBool::new(false);
+        let errors: Mutex<Vec<(String, String)>> = Mutex::new(Vec::new());
+        let written_files: Mutex<Vec<String>> = Mutex::new(Vec::new());
+
+        // Channel for progress updates from worker threads to the callback
+        let (tx, rx) = std::sync::mpsc::channel::<ProgressUpdate>();
+
+        let cancel_flag = &self.cancel_flag;
+        let pause_flag = &self.pause_flag;
+        let pause_on_error = self.pause_on_error;
+
+        // Run the parallel work in a scoped thread so we can drain progress concurrently
+        std::thread::scope(|scope| {
+            // Spawn the rayon pool work
+            let tx_clone = tx.clone();
+            let completed_ref = &completed;
+            let succeeded_ref = &succeeded_count;
+            let failed_ref = &failed_count;
+            let input_bytes_ref = &input_bytes;
+            let output_bytes_ref = &output_bytes;
+            let cancelled_ref = &cancelled;
+            let errors_ref = &errors;
+            let written_ref = &written_files;
+
+            let worker = scope.spawn(move || {
+                pool.install(|| {
+                    job.sources.par_iter().enumerate().for_each(|(idx, source)| {
+                        // Check cancel
+                        if cancel_flag.load(Ordering::Relaxed) {
+                            cancelled_ref.store(true, Ordering::Relaxed);
+                            return;
+                        }
+
+                        // Wait while paused
+                        while pause_flag.load(Ordering::Relaxed) {
+                            std::thread::sleep(std::time::Duration::from_millis(100));
+                            if cancel_flag.load(Ordering::Relaxed) {
+                                cancelled_ref.store(true, Ordering::Relaxed);
+                                return;
+                            }
+                        }
+
+                        if cancelled_ref.load(Ordering::Relaxed) {
+                            return;
+                        }
+
+                        let file_name = source
+                            .path
+                            .file_name()
+                            .and_then(|n| n.to_str())
+                            .unwrap_or("unknown")
+                            .to_string();
+
+                        let loader = ImageLoader::new();
+                        let encoder = OutputEncoder::with_options(EncoderOptions {
+                            progressive_jpeg: job.progressive_jpeg,
+                            avif_speed: job.avif_speed,
+                            output_dpi: job.output_dpi,
+                        });
+
+                        match Self::process_single_static(job, source, &loader, &encoder, idx) {
+                            Ok((in_size, out_size, out_path)) => {
+                                succeeded_ref.fetch_add(1, Ordering::Relaxed);
+                                input_bytes_ref.fetch_add(in_size, Ordering::Relaxed);
+                                output_bytes_ref.fetch_add(out_size, Ordering::Relaxed);
+                                if !out_path.as_os_str().is_empty() {
+                                    if let Ok(mut wf) = written_ref.lock() {
+                                        wf.push(out_path.display().to_string());
+                                    }
+                                }
+                            }
+                            Err(e) => {
+                                failed_ref.fetch_add(1, Ordering::Relaxed);
+                                if let Ok(mut errs) = errors_ref.lock() {
+                                    errs.push((file_name.clone(), e.to_string()));
+                                }
+                                if pause_on_error {
+                                    pause_flag.store(true, Ordering::Relaxed);
+                                }
+                            }
+                        }
+
+                        // Send progress after processing so counts are consistent
+                        let current = completed_ref.fetch_add(1, Ordering::Relaxed) + 1;
+                        let _ = tx_clone.send(ProgressUpdate {
+                            current,
+                            total,
+                            current_file: file_name,
+                            succeeded_so_far: succeeded_ref.load(Ordering::Relaxed),
+                            failed_so_far: failed_ref.load(Ordering::Relaxed),
+                        });
+                    });
+                });
+                // Drop sender so the receiver loop ends
+                drop(tx_clone);
+            });
+
+            // Drop the original sender so only the worker's clone keeps the channel open
+            drop(tx);
+
+            // Drain progress updates on this thread (the calling thread)
+            for update in rx {
+                on_progress(update);
+            }
+
+            // Wait for worker to finish (it already has by the time rx is drained)
+            let _ = worker.join();
+        });
+
+        Ok(BatchResult {
+            total,
+            succeeded: succeeded_count.load(Ordering::Relaxed),
+            failed: failed_count.load(Ordering::Relaxed),
+            cancelled: cancelled.load(Ordering::Relaxed),
+            total_input_bytes: input_bytes.load(Ordering::Relaxed),
+            total_output_bytes: output_bytes.load(Ordering::Relaxed),
+            errors: errors.into_inner().unwrap_or_default(),
+            elapsed_ms: start.elapsed().as_millis() as u64,
+            output_files: written_files.into_inner().unwrap_or_default(),
+        })
+    }
+
+    fn execute_sequential<F>(&self, job: &ProcessingJob, mut on_progress: F) -> Result<BatchResult>
+    where
+        F: FnMut(ProgressUpdate) + Send,
+    {
+        let start = Instant::now();
+        let total = job.sources.len();
+        let loader = ImageLoader::new();
+        let encoder = OutputEncoder::with_options(EncoderOptions {
+            progressive_jpeg: job.progressive_jpeg,
+            avif_speed: job.avif_speed,
+            output_dpi: job.output_dpi,
+        });
+
+        let mut result = BatchResult {
+            total,
+            succeeded: 0,
+            failed: 0,
+            cancelled: false,
+            total_input_bytes: 0,
+            total_output_bytes: 0,
+            errors: Vec::new(),
+            elapsed_ms: 0,
+            output_files: Vec::new(),
+        };
+
+        for (i, source) in job.sources.iter().enumerate() {
+            if self.cancel_flag.load(Ordering::Relaxed) {
+                result.cancelled = true;
+                break;
+            }
+
+            while self.pause_flag.load(Ordering::Relaxed) {
+                std::thread::sleep(std::time::Duration::from_millis(100));
+                if self.cancel_flag.load(Ordering::Relaxed) {
+                    result.cancelled = true;
+                    break;
+                }
+            }
+            if result.cancelled {
+                break;
+            }
+
+            let file_name = source
+                .path
+                .file_name()
+                .and_then(|n| n.to_str())
+                .unwrap_or("unknown")
+                .to_string();
+
+            on_progress(ProgressUpdate {
+                current: i + 1,
+                total,
+                current_file: file_name.clone(),
+                succeeded_so_far: result.succeeded,
+                failed_so_far: result.failed,
+            });
+
+            match Self::process_single_static(job, source, &loader, &encoder, i) {
+                Ok((input_size, output_size, out_path)) => {
+                    result.succeeded += 1;
+                    result.total_input_bytes += input_size;
+                    result.total_output_bytes += output_size;
+                    if !out_path.as_os_str().is_empty() {
+                        result.output_files.push(out_path.display().to_string());
+                    }
+                }
+                Err(e) => {
+                    result.failed += 1;
+                    result.errors.push((file_name, e.to_string()));
+                    if self.pause_on_error {
+                        self.pause_flag.store(true, Ordering::Relaxed);
+                    }
+                }
+            }
+        }
+
+        result.elapsed_ms = start.elapsed().as_millis() as u64;
+        Ok(result)
+    }
+
+    /// Compute the renamed output path for a source file.
+    /// `ext` is the output extension, `dims` is (width, height) or None.
+    fn compute_renamed_path(
+        job: &ProcessingJob,
+        rename: &crate::operations::RenameConfig,
+        source: &crate::types::ImageSource,
+        ext: &str,
+        index: usize,
+        dims: Option<(u32, u32)>,
+    ) -> std::path::PathBuf {
+        let stem = source.path.file_stem().and_then(|s| s.to_str()).unwrap_or("output");
+        if let Some(ref template) = rename.template {
+            let original_ext = source.path.extension().and_then(|e| e.to_str());
+            let working_stem = crate::operations::rename::apply_regex_replace(
+                stem, &rename.regex_find, &rename.regex_replace,
+            );
+            let working_stem = crate::operations::rename::apply_space_replacement(&working_stem, rename.replace_spaces);
+            let working_stem = crate::operations::rename::apply_special_chars(&working_stem, rename.special_chars);
+            let new_name = crate::operations::rename::apply_template_full(
+                template, &working_stem, ext,
+                rename.counter_start.saturating_add(index as u32),
+                dims, original_ext, Some(&source.path), None,
+            );
+            let new_name = if rename.case_mode > 0 {
+                if let Some(dot_pos) = new_name.rfind('.') {
+                    let (name_part, ext_part) = new_name.split_at(dot_pos);
+                    format!("{}{}", crate::operations::rename::apply_case_conversion(name_part, rename.case_mode), ext_part)
+                } else {
+                    crate::operations::rename::apply_case_conversion(&new_name, rename.case_mode)
+                }
+            } else {
+                new_name
+            };
+            job.output_dir.join(sanitize_filename(&new_name))
+        } else {
+            let new_name = rename.apply_simple(stem, ext, (index as u32).saturating_add(1));
+            job.output_dir.join(sanitize_filename(&new_name))
+        }
+    }
+
+    fn process_single_static(
+        job: &ProcessingJob,
+        source: &crate::types::ImageSource,
+        loader: &ImageLoader,
+        encoder: &OutputEncoder,
+        index: usize,
+    ) -> std::result::Result<(u64, u64, std::path::PathBuf), PixstripError> {
+        let input_size = std::fs::metadata(&source.path)
+            .map(|m| m.len())
+            .unwrap_or(0);
+
+        // Metadata stripping via little_exif only works for JPEG/TIFF.
+        // For other formats, force the pixel path so re-encoding strips metadata.
+        let metadata_needs_reencode = job.metadata.as_ref().is_some_and(|m| {
+            !matches!(m, crate::operations::MetadataConfig::KeepAll)
+                && !matches!(
+                    source.original_format,
+                    Some(ImageFormat::Jpeg) | Some(ImageFormat::Tiff)
+                )
+        });
+
+        // Fast path: if no pixel processing needed (rename-only or rename+metadata),
+        // just copy the file instead of decoding/re-encoding.
+        if !job.needs_pixel_processing() && !metadata_needs_reencode {
+            let output_path = if let Some(ref rename) = job.rename {
+                let ext = source.path.extension().and_then(|e| e.to_str()).unwrap_or("jpg");
+                // Read dimensions without full decode for {width}/{height} templates
+                let dims = if rename.template.is_some() {
+                    image::ImageReader::open(&source.path)
+                        .ok()
+                        .and_then(|r| r.with_guessed_format().ok())
+                        .and_then(|r| r.into_dimensions().ok())
+                } else {
+                    None
+                };
+                Self::compute_renamed_path(job, rename, source, ext, index, dims)
+            } else {
+                job.output_path_for(source, None)
+            };
+
+            // Prevent overwriting the source file
+            if paths_are_same(&source.path, &output_path) {
+                return Err(PixstripError::Processing {
+                    operation: "output".into(),
+                    reason: format!("output path is the same as source: {}", source.path.display()),
+                });
+            }
+
+            let output_path = match job.overwrite_behavior {
+                crate::operations::OverwriteAction::Skip if output_path.exists() => {
+                    return Ok((0, 0, std::path::PathBuf::new()));
+                }
+                crate::operations::OverwriteAction::AutoRename if output_path.exists() => {
+                    find_unique_path(&output_path)
+                }
+                _ => output_path,
+            };
+
+            if let Some(parent) = output_path.parent() {
+                std::fs::create_dir_all(parent).map_err(|e| {
+                    cleanup_placeholder(&output_path);
+                    PixstripError::Io(e)
+                })?;
+            }
+
+            std::fs::copy(&source.path, &output_path).map_err(|e| {
+                cleanup_placeholder(&output_path);
+                PixstripError::Io(e)
+            })?;
+
+            // Metadata handling on the copy
+            if let Some(ref meta_config) = job.metadata {
+                match meta_config {
+                    crate::operations::MetadataConfig::KeepAll => {
+                        // Already a copy - metadata preserved
+                    }
+                    crate::operations::MetadataConfig::StripAll => {
+                        if !strip_all_metadata(&output_path) {
+                            eprintln!("Warning: failed to strip metadata from {}", output_path.display());
+                        }
+                    }
+                    _ => {
+                        strip_selective_metadata(&output_path, meta_config);
+                    }
+                }
+            }
+
+            let output_size = std::fs::metadata(&output_path).map(|m| m.len()).unwrap_or(0);
+            return Ok((input_size, output_size, output_path));
+        }
+
+        // Load image
+        let mut img = loader.load_pixels(&source.path)?;
+
+        // Rotation
+        if let Some(ref rotation) = job.rotation {
+            img = match rotation {
+                Rotation::None => img,
+                Rotation::Cw90 => img.rotate90(),
+                Rotation::Cw180 => img.rotate180(),
+                Rotation::Cw270 => img.rotate270(),
+                Rotation::AutoOrient => auto_orient_from_exif(img, &source.path),
+            };
+        }
+
+        // Flip
+        if let Some(ref flip) = job.flip {
+            img = match flip {
+                Flip::None => img,
+                Flip::Horizontal => img.fliph(),
+                Flip::Vertical => img.flipv(),
+            };
+        }
+
+        // Resize
+        if let Some(ref config) = job.resize {
+            img = resize_image_with_algorithm(&img, config, job.resize_algorithm)?;
+        }
+
+        // Adjustments (brightness, contrast, saturation, effects, crop, padding)
+        if let Some(ref adj) = job.adjustments {
+            if !adj.is_noop() {
+                img = apply_adjustments(img, adj)?;
+            }
+        }
+
+        // Determine output format
+        let output_format = if let Some(ref convert) = job.convert {
+            let input_fmt = source.original_format.unwrap_or(ImageFormat::Jpeg);
+            convert.output_format(input_fmt)
+        } else {
+            source.original_format.unwrap_or(ImageFormat::Jpeg)
+        };
+
+        // Determine quality
+        let quality = job.compress.as_ref().map(|c| match c {
+            crate::operations::CompressConfig::Preset(preset) => {
+                encoder.quality_for_format(output_format, preset)
+            }
+            crate::operations::CompressConfig::Custom {
+                jpeg_quality,
+                png_level,
+                webp_quality,
+                avif_quality,
+            } => match output_format {
+                ImageFormat::Jpeg => jpeg_quality.unwrap_or(85),
+                ImageFormat::Png => png_level.unwrap_or(6),
+                ImageFormat::WebP => webp_quality.map(|q| q.clamp(0.0, 100.0) as u8).unwrap_or(80),
+                ImageFormat::Avif => avif_quality.map(|q| q.clamp(0.0, 100.0) as u8).unwrap_or(50),
+                _ => 85,
+            },
+        });
+
+        // Determine output path (with rename if configured)
+        let output_path = if let Some(ref rename) = job.rename {
+            let ext = output_format.extension();
+            let dims = Some((img.width(), img.height()));
+            Self::compute_renamed_path(job, rename, source, ext, index, dims)
+        } else {
+            job.output_path_for(source, Some(output_format))
+        };
+
+        // Prevent overwriting the source file
+        if paths_are_same(&source.path, &output_path) {
+            return Err(PixstripError::Processing {
+                operation: "output".into(),
+                reason: format!("output path is the same as source: {}", source.path.display()),
+            });
+        }
+
+        // Handle overwrite behavior
+        let output_path = match job.overwrite_behavior {
+            crate::operations::OverwriteAction::Skip => {
+                if output_path.exists() {
+                    // Return 0 bytes written - file was skipped
+                    return Ok((0, 0, std::path::PathBuf::new()));
+                }
+                output_path
+            }
+            crate::operations::OverwriteAction::AutoRename => {
+                if output_path.exists() {
+                    find_unique_path(&output_path)
+                } else {
+                    output_path
+                }
+            }
+            crate::operations::OverwriteAction::Overwrite => output_path,
+        };
+
+        // Ensure output directory exists
+        if let Some(parent) = output_path.parent() {
+            std::fs::create_dir_all(parent).map_err(|e| {
+                cleanup_placeholder(&output_path);
+                PixstripError::Io(e)
+            })?;
+        }
+
+        // Watermark (after compress settings determined, before encode)
+        if let Some(ref config) = job.watermark {
+            img = apply_watermark(img, config).map_err(|e| {
+                cleanup_placeholder(&output_path);
+                e
+            })?;
+        }
+
+        // Encode and save
+        encoder.encode_to_file(&img, &output_path, output_format, quality).map_err(|e| {
+            cleanup_placeholder(&output_path);
+            e
+        })?;
+
+        // Metadata handling: re-encoding strips all EXIF by default.
+        // KeepAll: copy everything back from source.
+        // Privacy/Custom: copy metadata back, then selectively strip certain tags.
+        // StripAll: do nothing (already stripped by re-encoding).
+        // Note: little_exif only supports JPEG and TIFF metadata manipulation.
+        if let Some(ref meta_config) = job.metadata {
+            let format_supports_exif = matches!(
+                output_format,
+                ImageFormat::Jpeg | ImageFormat::Tiff
+            );
+            match meta_config {
+                crate::operations::MetadataConfig::KeepAll => {
+                    if format_supports_exif {
+                        if !copy_metadata_from_source(&source.path, &output_path) {
+                            eprintln!("Warning: failed to copy metadata to {}", output_path.display());
+                        }
+                    } else {
+                        eprintln!("Warning: metadata cannot be preserved for {} format ({})", output_format.extension(), output_path.display());
+                    }
+                }
+                crate::operations::MetadataConfig::StripAll => {
+                    // Already stripped by re-encoding - nothing to do
+                }
+                _ => {
+                    // Privacy or Custom: copy all metadata back, then strip unwanted tags
+                    if format_supports_exif {
+                        if !copy_metadata_from_source(&source.path, &output_path) {
+                            eprintln!("Warning: failed to copy metadata to {}", output_path.display());
+                        }
+                        strip_selective_metadata(&output_path, meta_config);
+                    }
+                }
+            }
+        }
+
+        let output_size = std::fs::metadata(&output_path)
+            .map(|m| m.len())
+            .unwrap_or(0);
+
+        Ok((input_size, output_size, output_path))
+    }
+}
+
+impl Default for PipelineExecutor {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+fn num_cpus() -> usize {
+    std::thread::available_parallelism()
+        .map(|n| n.get())
+        .unwrap_or(1)
+}
+
+/// Read EXIF orientation tag and apply the appropriate rotation/flip.
+/// EXIF orientation values:
+/// 1 = Normal, 2 = Flipped horizontal, 3 = Rotated 180,
+/// 4 = Flipped vertical, 5 = Transposed (flip H + rotate 270),
+/// 6 = Rotated 90 CW, 7 = Transverse (flip H + rotate 90),
+/// 8 = Rotated 270 CW
+fn auto_orient_from_exif(
+    img: image::DynamicImage,
+    path: &std::path::Path,
+) -> image::DynamicImage {
+    let Ok(metadata) = little_exif::metadata::Metadata::new_from_path(path) else {
+        return img;
+    };
+
+    let endian = metadata.get_endian();
+    let Some(tag) = metadata.get_tag(&little_exif::exif_tag::ExifTag::Orientation(Vec::new())) else {
+        return img;
+    };
+
+    let bytes = tag.value_as_u8_vec(endian);
+    if bytes.len() < 2 {
+        return img;
+    }
+
+    // Orientation is a 16-bit unsigned integer
+    let orientation = match endian {
+        little_exif::endian::Endian::Little => u16::from_le_bytes([bytes[0], bytes[1]]),
+        little_exif::endian::Endian::Big => u16::from_be_bytes([bytes[0], bytes[1]]),
+    };
+
+    match orientation {
+        1 => img,                                          // Normal
+        2 => img.fliph(),                                  // Flipped horizontal
+        3 => img.rotate180(),                              // Rotated 180
+        4 => img.flipv(),                                  // Flipped vertical
+        5 => img.fliph().rotate270(),                      // Transposed
+        6 => img.rotate90(),                               // Rotated 90 CW
+        7 => img.fliph().rotate90(),                       // Transverse
+        8 => img.rotate270(),                              // Rotated 270 CW
+        _ => img,
+    }
+}
+
+/// Strip path separators and parent-directory components from a user-provided filename.
+/// Prevents path traversal attacks via rename templates (e.g., "../../etc/passwd").
+fn sanitize_filename(name: &str) -> String {
+    let path = std::path::Path::new(name);
+    path.file_name()
+        .and_then(|f| f.to_str())
+        .unwrap_or("output")
+        .to_string()
+}
+
+/// Check if two paths refer to the same file (resolves symlinks and relative paths).
+fn paths_are_same(a: &std::path::Path, b: &std::path::Path) -> bool {
+    match (a.canonicalize(), b.canonicalize()) {
+        (Ok(ca), Ok(cb)) => ca == cb,
+        _ => {
+            // If canonicalize fails (output file doesn't exist yet),
+            // canonicalize parent directories and compare with filename appended
+            let resolve = |p: &std::path::Path| -> Option<std::path::PathBuf> {
+                let parent = p.parent()?;
+                let name = p.file_name()?;
+                Some(parent.canonicalize().ok()?.join(name))
+            };
+            match (resolve(a), resolve(b)) {
+                (Some(ra), Some(rb)) => ra == rb,
+                _ => a.as_os_str() == b.as_os_str(),
+            }
+        }
+    }
+}
+
+/// Remove a placeholder file created by find_unique_path on error.
+/// Placeholders are either 0-byte (no marker) or 1-byte (marker `~`).
+fn cleanup_placeholder(path: &std::path::Path) {
+    if let Ok(meta) = std::fs::metadata(path) {
+        if meta.len() <= 1 {
+            let _ = std::fs::remove_file(path);
+        }
+    }
+}
+
+fn find_unique_path(path: &std::path::Path) -> std::path::PathBuf {
+    let stem = path
+        .file_stem()
+        .and_then(|s| s.to_str())
+        .unwrap_or("output");
+    let ext = path
+        .extension()
+        .and_then(|e| e.to_str())
+        .unwrap_or("bin");
+    let parent = path.parent().unwrap_or_else(|| std::path::Path::new("."));
+
+    // Use O_CREAT | O_EXCL via create_new() to atomically reserve the path,
+    // preventing TOCTOU races when multiple threads auto-rename concurrently.
+    for i in 1u32..10000 {
+        let candidate = parent.join(format!("{}_{}.{}", stem, i, ext));
+        match std::fs::OpenOptions::new()
+            .write(true)
+            .create_new(true)
+            .open(&candidate)
+        {
+            Ok(mut f) => {
+                // Write a marker byte so cleanup_placeholder (which only removes
+                // 0-byte files) won't delete our reservation before the real write
+                let _ = std::io::Write::write_all(&mut f, b"~");
+                return candidate;
+            }
+            Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => continue,
+            Err(_) => continue,
+        }
+    }
+    // Extremely unlikely fallback - use timestamp for uniqueness
+    parent.join(format!("{}_{}.{}", stem, std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_millis())
+        .unwrap_or(0), ext))
+}
+
+fn copy_metadata_from_source(source: &std::path::Path, output: &std::path::Path) -> bool {
+    let Ok(metadata) = little_exif::metadata::Metadata::new_from_path(source) else {
+        return false;
+    };
+    metadata.write_to_file(output).is_ok()
+}
+
+fn strip_all_metadata(path: &std::path::Path) -> bool {
+    let empty = little_exif::metadata::Metadata::new();
+    empty.write_to_file(path).is_ok()
+}
+
+fn strip_selective_metadata(
+    path: &std::path::Path,
+    config: &crate::operations::MetadataConfig,
+) -> bool {
+    use little_exif::exif_tag::ExifTag;
+    use little_exif::metadata::Metadata;
+
+    // Read the metadata we just wrote back
+    let Ok(source_meta) = Metadata::new_from_path(path) else {
+        return false;
+    };
+
+    // Build a set of tag IDs to strip
+    let mut strip_ids: Vec<u16> = Vec::new();
+
+    if config.should_strip_gps() {
+        // GPSInfo pointer (0x8825) - removing it strips the GPS sub-IFD reference
+        strip_ids.push(ExifTag::GPSInfo(Vec::new()).as_u16());
+    }
+
+    if config.should_strip_camera() {
+        strip_ids.push(ExifTag::Make(String::new()).as_u16());
+        strip_ids.push(ExifTag::Model(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensModel(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensMake(String::new()).as_u16());
+        strip_ids.push(ExifTag::SerialNumber(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensSerialNumber(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensInfo(Vec::new()).as_u16());
+    }
+
+    if config.should_strip_software() {
+        strip_ids.push(ExifTag::Software(String::new()).as_u16());
+        strip_ids.push(ExifTag::MakerNote(Vec::new()).as_u16());
+    }
+
+    if config.should_strip_timestamps() {
+        strip_ids.push(ExifTag::ModifyDate(String::new()).as_u16());
+        strip_ids.push(ExifTag::DateTimeOriginal(String::new()).as_u16());
+        strip_ids.push(ExifTag::CreateDate(String::new()).as_u16());
+        strip_ids.push(ExifTag::SubSecTime(String::new()).as_u16());
+        strip_ids.push(ExifTag::SubSecTimeOriginal(String::new()).as_u16());
+        strip_ids.push(ExifTag::SubSecTimeDigitized(String::new()).as_u16());
+        strip_ids.push(ExifTag::OffsetTime(String::new()).as_u16());
+        strip_ids.push(ExifTag::OffsetTimeOriginal(String::new()).as_u16());
+        strip_ids.push(ExifTag::OffsetTimeDigitized(String::new()).as_u16());
+    }
+
+    if config.should_strip_copyright() {
+        strip_ids.push(ExifTag::Copyright(String::new()).as_u16());
+        strip_ids.push(ExifTag::Artist(String::new()).as_u16());
+        strip_ids.push(ExifTag::OwnerName(String::new()).as_u16());
+    }
+
+    // Build new metadata with only the tags we want to keep
+    let mut new_meta = Metadata::new();
+    for tag in source_meta.data() {
+        if !strip_ids.contains(&tag.as_u16()) {
+            new_meta.set_tag(tag.clone());
+        }
+    }
+
+    new_meta.write_to_file(path).is_ok()
+}

pixstrip-core/src/fm_integration.rs

@@ -0,0 +1,442 @@
+use std::path::{Path, PathBuf};
+
+use crate::error::Result;
+use crate::preset::Preset;
+use crate::storage::{atomic_write, PresetStore};
+
+/// Supported file managers for right-click integration.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum FileManager {
+    Nautilus,
+    Nemo,
+    Thunar,
+    Dolphin,
+}
+
+impl FileManager {
+    /// Human-readable name.
+    pub fn name(&self) -> &'static str {
+        match self {
+            Self::Nautilus => "Nautilus",
+            Self::Nemo => "Nemo",
+            Self::Thunar => "Thunar",
+            Self::Dolphin => "Dolphin",
+        }
+    }
+
+    /// Desktop file ID used to detect if the FM is installed.
+    pub fn desktop_id(&self) -> &'static str {
+        match self {
+            Self::Nautilus => "org.gnome.Nautilus",
+            Self::Nemo => "org.nemo.Nemo",
+            Self::Thunar => "thunar",
+            Self::Dolphin => "org.kde.dolphin",
+        }
+    }
+
+    /// Install the integration extension for this file manager.
+    pub fn install(&self) -> Result<()> {
+        match self {
+            Self::Nautilus => install_nautilus(),
+            Self::Nemo => install_nemo(),
+            Self::Thunar => install_thunar(),
+            Self::Dolphin => install_dolphin(),
+        }
+    }
+
+    /// Remove the integration extension for this file manager.
+    pub fn uninstall(&self) -> Result<()> {
+        match self {
+            Self::Nautilus => uninstall_nautilus(),
+            Self::Nemo => uninstall_nemo(),
+            Self::Thunar => uninstall_thunar(),
+            Self::Dolphin => uninstall_dolphin(),
+        }
+    }
+
+    /// Check if the integration is currently installed.
+    pub fn is_installed(&self) -> bool {
+        match self {
+            Self::Nautilus => nautilus_extension_path().exists(),
+            Self::Nemo => nemo_action_path().exists(),
+            Self::Thunar => thunar_action_path().exists(),
+            Self::Dolphin => dolphin_service_path().exists(),
+        }
+    }
+}
+
+/// Regenerate the extension files for all installed file managers.
+/// Call this after presets change so the submenu stays up to date.
+pub fn regenerate_all() -> Result<()> {
+    for fm in &[FileManager::Nautilus, FileManager::Nemo, FileManager::Thunar, FileManager::Dolphin] {
+        if fm.is_installed() {
+            fm.install()?;
+        }
+    }
+    Ok(())
+}
+
+/// Sanitize a string for safe use in shell Exec= lines and XML command elements.
+/// Removes or replaces characters that could cause shell injection.
+fn shell_safe(s: &str) -> String {
+    s.chars()
+        .filter(|c| c.is_alphanumeric() || matches!(c, ' ' | '-' | '_' | '.' | '(' | ')' | ','))
+        .collect()
+}
+
+fn pixstrip_bin() -> String {
+    // Try to find the pixstrip binary path
+    if let Ok(exe) = std::env::current_exe() {
+        // If running from the GTK app, find the CLI sibling
+        let dir = exe.parent().unwrap_or(Path::new("/usr/bin"));
+        let cli_path = dir.join("pixstrip");
+        if cli_path.exists() {
+            return cli_path.display().to_string();
+        }
+        let gtk_path = dir.join("pixstrip-gtk");
+        if gtk_path.exists() {
+            return gtk_path.display().to_string();
+        }
+        return exe.display().to_string();
+    }
+    "pixstrip-gtk".into()
+}
+
+fn get_preset_names() -> Vec<String> {
+    let mut names: Vec<String> = Preset::all_builtins()
+        .into_iter()
+        .map(|p| p.name)
+        .collect();
+
+    let store = PresetStore::new();
+    if let Ok(user_presets) = store.list() {
+        for p in user_presets {
+            if p.is_custom && !names.contains(&p.name) {
+                names.push(p.name);
+            }
+        }
+    }
+    names
+}
+
+// --- Nautilus (Python extension) ---
+
+fn nautilus_extension_dir() -> PathBuf {
+    let data = std::env::var("XDG_DATA_HOME")
+        .unwrap_or_else(|_| {
+            let home = std::env::var("HOME").unwrap_or_else(|_| dirs::home_dir().map(|h| h.to_string_lossy().into_owned()).unwrap_or_else(|| "/tmp".into()));
+            format!("{}/.local/share", home)
+        });
+    PathBuf::from(data).join("nautilus-python").join("extensions")
+}
+
+fn nautilus_extension_path() -> PathBuf {
+    nautilus_extension_dir().join("pixstrip-integration.py")
+}
+
+fn install_nautilus() -> Result<()> {
+    let dir = nautilus_extension_dir();
+    std::fs::create_dir_all(&dir)?;
+
+    let bin = pixstrip_bin();
+    let presets = get_preset_names();
+
+    let mut preset_items = String::new();
+    for name in &presets {
+        preset_items.push_str(&format!(
+            "        item = Nautilus.MenuItem(\n\
+             \x20           name='Pixstrip::Preset::{}',\n\
+             \x20           label='{}',\n\
+             \x20       )\n\
+             \x20       item.connect('activate', self._on_preset, '{}', files)\n\
+             \x20       submenu.append_item(item)\n\n",
+            name.replace(' ', "_"),
+            name.replace('\\', "\\\\").replace('\'', "\\'"),
+            name.replace('\\', "\\\\").replace('\'', "\\'"),
+        ));
+    }
+
+    let escaped_bin = bin.replace('\\', "\\\\").replace('\'', "\\'");
+    let script = format!(
+        r#"import subprocess
+from gi.repository import Nautilus, GObject
+
+class PixstripExtension(GObject.GObject, Nautilus.MenuProvider):
+    def get_file_items(self, files):
+        if not files:
+            return []
+
+        # Only show for image files
+        image_mimes = ['image/jpeg', 'image/png', 'image/webp', 'image/gif',
+                       'image/tiff', 'image/avif', 'image/bmp']
+        valid = [f for f in files if f.get_mime_type() in image_mimes or f.is_directory()]
+        if not valid:
+            return []
+
+        top = Nautilus.MenuItem(
+            name='Pixstrip::Menu',
+            label='Process with Pixstrip',
+            icon='applications-graphics-symbolic',
+        )
+
+        submenu = Nautilus.Menu()
+        top.set_submenu(submenu)
+
+        # Open in Pixstrip (wizard)
+        open_item = Nautilus.MenuItem(
+            name='Pixstrip::Open',
+            label='Open in Pixstrip...',
+        )
+        open_item.connect('activate', self._on_open, files)
+        submenu.append_item(open_item)
+
+        # Separator via disabled item
+        sep = Nautilus.MenuItem(
+            name='Pixstrip::Sep',
+            label='---',
+            sensitive=False,
+        )
+        submenu.append_item(sep)
+
+        # Preset items
+{preset_items}
+        return [top]
+
+    def _on_open(self, menu, files):
+        paths = [f.get_location().get_path() for f in files if f.get_location()]
+        subprocess.Popen(['{bin}', '--files'] + paths)
+
+    def _on_preset(self, menu, preset_name, files):
+        paths = [f.get_location().get_path() for f in files if f.get_location()]
+        subprocess.Popen(['{bin}', '--preset', preset_name, '--files'] + paths)
+"#,
+        preset_items = preset_items,
+        bin = escaped_bin,
+    );
+
+    atomic_write(&nautilus_extension_path(), &script)?;
+    Ok(())
+}
+
+fn uninstall_nautilus() -> Result<()> {
+    let path = nautilus_extension_path();
+    if path.exists() {
+        std::fs::remove_file(path)?;
+    }
+    Ok(())
+}
+
+// --- Nemo (.nemo_action files) ---
+
+fn nemo_action_dir() -> PathBuf {
+    let data = std::env::var("XDG_DATA_HOME")
+        .unwrap_or_else(|_| {
+            let home = std::env::var("HOME").unwrap_or_else(|_| dirs::home_dir().map(|h| h.to_string_lossy().into_owned()).unwrap_or_else(|| "/tmp".into()));
+            format!("{}/.local/share", home)
+        });
+    PathBuf::from(data).join("nemo").join("actions")
+}
+
+fn nemo_action_path() -> PathBuf {
+    nemo_action_dir().join("pixstrip-open.nemo_action")
+}
+
+fn install_nemo() -> Result<()> {
+    let dir = nemo_action_dir();
+    std::fs::create_dir_all(&dir)?;
+
+    let bin = pixstrip_bin();
+
+    // Main "Open in Pixstrip" action
+    let open_action = format!(
+        "[Nemo Action]\n\
+         Name=Open in Pixstrip...\n\
+         Comment=Process images with Pixstrip\n\
+         Exec={bin} --files %F\n\
+         Icon-Name=applications-graphics-symbolic\n\
+         Selection=Any\n\
+         Extensions=jpg;jpeg;png;webp;gif;tiff;tif;avif;bmp;\n\
+         Mimetypes=image/*;\n",
+        bin = bin,
+    );
+    atomic_write(&nemo_action_path(), &open_action)?;
+
+    // Per-preset actions
+    let presets = get_preset_names();
+    for name in &presets {
+        let safe_name = name.replace(' ', "-").to_lowercase();
+        let action_path = dir.join(format!("pixstrip-preset-{}.nemo_action", safe_name));
+        let action = format!(
+            "[Nemo Action]\n\
+             Name=Pixstrip: {name}\n\
+             Comment=Process with {name} preset\n\
+             Exec={bin} --preset \"{safe_label}\" --files %F\n\
+             Icon-Name=applications-graphics-symbolic\n\
+             Selection=Any\n\
+             Extensions=jpg;jpeg;png;webp;gif;tiff;tif;avif;bmp;\n\
+             Mimetypes=image/*;\n",
+            name = name,
+            safe_label = shell_safe(name),
+            bin = bin,
+        );
+        atomic_write(&action_path, &action)?;
+    }
+
+    Ok(())
+}
+
+fn uninstall_nemo() -> Result<()> {
+    let dir = nemo_action_dir();
+    // Remove main action
+    let main_path = nemo_action_path();
+    if main_path.exists() {
+        std::fs::remove_file(main_path)?;
+    }
+    // Remove preset actions
+    if dir.exists() {
+        for entry in std::fs::read_dir(&dir)?.flatten() {
+            let name = entry.file_name();
+            let name_str = name.to_string_lossy();
+            if name_str.starts_with("pixstrip-preset-") && name_str.ends_with(".nemo_action") {
+                let _ = std::fs::remove_file(entry.path());
+            }
+        }
+    }
+    Ok(())
+}
+
+// --- Thunar (Custom Actions via uca.xml) ---
+
+fn thunar_action_dir() -> PathBuf {
+    let config = std::env::var("XDG_CONFIG_HOME")
+        .unwrap_or_else(|_| {
+            let home = std::env::var("HOME").unwrap_or_else(|_| dirs::home_dir().map(|h| h.to_string_lossy().into_owned()).unwrap_or_else(|| "/tmp".into()));
+            format!("{}/.config", home)
+        });
+    PathBuf::from(config).join("Thunar")
+}
+
+fn thunar_action_path() -> PathBuf {
+    thunar_action_dir().join("pixstrip-actions.xml")
+}
+
+fn install_thunar() -> Result<()> {
+    let dir = thunar_action_dir();
+    std::fs::create_dir_all(&dir)?;
+
+    let bin = pixstrip_bin();
+    let presets = get_preset_names();
+
+    let mut actions = String::from("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<actions>\n");
+
+    // Open in Pixstrip
+    actions.push_str(&format!(
+        "  <action>\n\
+         \x20   <icon>applications-graphics-symbolic</icon>\n\
+         \x20   <name>Open in Pixstrip...</name>\n\
+         \x20   <command>{bin} --files %F</command>\n\
+         \x20   <description>Process images with Pixstrip</description>\n\
+         \x20   <patterns>*.jpg;*.jpeg;*.png;*.webp;*.gif;*.tiff;*.tif;*.avif;*.bmp</patterns>\n\
+         \x20   <image-files/>\n\
+         \x20   <directories/>\n\
+         </action>\n",
+        bin = bin,
+    ));
+
+    for name in &presets {
+        actions.push_str(&format!(
+            "  <action>\n\
+             \x20   <icon>applications-graphics-symbolic</icon>\n\
+             \x20   <name>Pixstrip: {xml_name}</name>\n\
+             \x20   <command>{bin} --preset \"{safe_label}\" --files %F</command>\n\
+             \x20   <description>Process with {xml_name} preset</description>\n\
+             \x20   <patterns>*.jpg;*.jpeg;*.png;*.webp;*.gif;*.tiff;*.tif;*.avif;*.bmp</patterns>\n\
+             \x20   <image-files/>\n\
+             \x20   <directories/>\n\
+             </action>\n",
+            xml_name = name.replace('&', "&amp;").replace('<', "&lt;").replace('>', "&gt;").replace('"', "&quot;"),
+            safe_label = shell_safe(name),
+            bin = bin,
+        ));
+    }
+
+    actions.push_str("</actions>\n");
+    atomic_write(&thunar_action_path(), &actions)?;
+    Ok(())
+}
+
+fn uninstall_thunar() -> Result<()> {
+    let path = thunar_action_path();
+    if path.exists() {
+        std::fs::remove_file(path)?;
+    }
+    Ok(())
+}
+
+// --- Dolphin (KDE Service Menu) ---
+
+fn dolphin_service_dir() -> PathBuf {
+    let data = std::env::var("XDG_DATA_HOME")
+        .unwrap_or_else(|_| {
+            let home = std::env::var("HOME").unwrap_or_else(|_| dirs::home_dir().map(|h| h.to_string_lossy().into_owned()).unwrap_or_else(|| "/tmp".into()));
+            format!("{}/.local/share", home)
+        });
+    PathBuf::from(data).join("kio").join("servicemenus")
+}
+
+fn dolphin_service_path() -> PathBuf {
+    dolphin_service_dir().join("pixstrip.desktop")
+}
+
+fn install_dolphin() -> Result<()> {
+    let dir = dolphin_service_dir();
+    std::fs::create_dir_all(&dir)?;
+
+    let bin = pixstrip_bin();
+    let presets = get_preset_names();
+
+    let mut desktop = format!(
+        "[Desktop Entry]\n\
+         Type=Service\n\
+         X-KDE-ServiceTypes=KonqPopupMenu/Plugin\n\
+         MimeType=image/jpeg;image/png;image/webp;image/gif;image/tiff;image/avif;image/bmp;inode/directory;\n\
+         Actions=Open;{preset_actions}\n\
+         X-KDE-Submenu=Process with Pixstrip\n\
+         Icon=applications-graphics-symbolic\n\n\
+         [Desktop Action Open]\n\
+         Name=Open in Pixstrip...\n\
+         Icon=applications-graphics-symbolic\n\
+         Exec={bin} --files %F\n\n",
+        bin = bin,
+        preset_actions = presets
+            .iter()
+            .enumerate()
+            .map(|(i, _)| format!("Preset{}", i))
+            .collect::<Vec<_>>()
+            .join(";"),
+    );
+
+    for (i, name) in presets.iter().enumerate() {
+        desktop.push_str(&format!(
+            "[Desktop Action Preset{i}]\n\
+             Name={name}\n\
+             Icon=applications-graphics-symbolic\n\
+             Exec={bin} --preset \"{safe_label}\" --files %F\n\n",
+            i = i,
+            name = name,
+            safe_label = shell_safe(name),
+            bin = bin,
+        ));
+    }
+
+    atomic_write(&dolphin_service_path(), &desktop)?;
+    Ok(())
+}
+
+fn uninstall_dolphin() -> Result<()> {
+    let path = dolphin_service_path();
+    if path.exists() {
+        std::fs::remove_file(path)?;
+    }
+    Ok(())
+}

pixstrip-core/src/lib.rs

@@ -1,9 +1,16 @@
 pub mod config;
+pub mod discovery;
+pub mod encoder;
 pub mod error;
+pub mod executor;
+pub mod fm_integration;
+pub mod loader;
 pub mod operations;
 pub mod pipeline;
 pub mod preset;
+pub mod storage;
 pub mod types;
+pub mod watcher;
 
 pub fn version() -> &'static str {
     env!("CARGO_PKG_VERSION")

pixstrip-core/src/loader.rs

@@ -0,0 +1,67 @@
+use std::path::Path;
+
+use crate::error::{PixstripError, Result};
+use crate::types::{Dimensions, ImageFormat};
+
+#[derive(Debug, Clone)]
+pub struct ImageInfo {
+    pub dimensions: Dimensions,
+    pub format: Option<ImageFormat>,
+    pub file_size: u64,
+}
+
+pub struct ImageLoader;
+
+impl ImageLoader {
+    pub fn new() -> Self {
+        Self
+    }
+
+    pub fn load_info(&self, path: &Path) -> Result<ImageInfo> {
+        let metadata = std::fs::metadata(path).map_err(|e| PixstripError::ImageLoad {
+            path: path.to_path_buf(),
+            reason: e.to_string(),
+        })?;
+
+        let reader =
+            image::ImageReader::open(path).map_err(|e| PixstripError::ImageLoad {
+                path: path.to_path_buf(),
+                reason: e.to_string(),
+            })?;
+
+        let reader = reader.with_guessed_format().map_err(|e| PixstripError::ImageLoad {
+            path: path.to_path_buf(),
+            reason: e.to_string(),
+        })?;
+
+        // Read only the image header for dimensions (avoids full decode into RAM)
+        let (width, height) = reader.into_dimensions().map_err(|e| PixstripError::ImageLoad {
+            path: path.to_path_buf(),
+            reason: e.to_string(),
+        })?;
+
+        let format = path
+            .extension()
+            .and_then(|ext| ext.to_str())
+            .and_then(ImageFormat::from_extension);
+
+        Ok(ImageInfo {
+            dimensions: Dimensions { width, height },
+            format,
+            file_size: metadata.len(),
+        })
+    }
+
+    pub fn load_pixels(&self, path: &Path) -> Result<image::DynamicImage> {
+        image::open(path).map_err(|e| PixstripError::ImageLoad {
+            path: path.to_path_buf(),
+            reason: e.to_string(),
+        })
+    }
+}
+
+impl Default for ImageLoader {
+    fn default() -> Self {
+        Self::new()
+    }
+}

pixstrip-core/src/operations/adjustments.rs

@@ -0,0 +1,207 @@
+use image::{DynamicImage, Rgba, RgbaImage};
+
+use crate::error::Result;
+use super::AdjustmentsConfig;
+
+pub fn apply_adjustments(
+    mut img: DynamicImage,
+    config: &AdjustmentsConfig,
+) -> Result<DynamicImage> {
+    // Crop to aspect ratio (before other adjustments)
+    if let Some((w_ratio, h_ratio)) = config.crop_aspect_ratio {
+        img = crop_to_aspect_ratio(img, w_ratio, h_ratio);
+    }
+
+    // Trim whitespace
+    if config.trim_whitespace {
+        img = trim_whitespace(img);
+    }
+
+    // Brightness
+    if config.brightness != 0 {
+        img = img.brighten(config.brightness);
+    }
+
+    // Contrast
+    if config.contrast != 0 {
+        img = img.adjust_contrast(config.contrast as f32);
+    }
+
+    // Saturation
+    if config.saturation != 0 {
+        img = adjust_saturation(img, config.saturation);
+    }
+
+    // Grayscale
+    if config.grayscale {
+        img = img.grayscale();
+    }
+
+    // Sepia
+    if config.sepia {
+        img = apply_sepia(img);
+    }
+
+    // Sharpen
+    if config.sharpen {
+        img = img.unsharpen(1.0, 5);
+    }
+
+    // Canvas padding
+    if config.canvas_padding > 0 {
+        img = add_canvas_padding(img, config.canvas_padding);
+    }
+
+    Ok(img)
+}
+
+fn crop_to_aspect_ratio(img: DynamicImage, w_ratio: f64, h_ratio: f64) -> DynamicImage {
+    let (iw, ih) = (img.width(), img.height());
+    if !w_ratio.is_finite() || !h_ratio.is_finite()
+        || w_ratio <= 0.0 || h_ratio <= 0.0
+        || iw == 0 || ih == 0
+    {
+        return img;
+    }
+    let target_ratio = w_ratio / h_ratio;
+    let current_ratio = iw as f64 / ih as f64;
+
+    let (crop_w, crop_h) = if current_ratio > target_ratio {
+        // Image is wider than target, crop width
+        let new_w = (ih as f64 * target_ratio).round().max(1.0) as u32;
+        (new_w.min(iw).max(1), ih)
+    } else {
+        // Image is taller than target, crop height
+        let new_h = (iw as f64 / target_ratio).round().max(1.0) as u32;
+        (iw, new_h.min(ih).max(1))
+    };
+
+    let x = iw.saturating_sub(crop_w) / 2;
+    let y = ih.saturating_sub(crop_h) / 2;
+
+    img.crop_imm(x, y, crop_w, crop_h)
+}
+
+fn trim_whitespace(img: DynamicImage) -> DynamicImage {
+    let rgba = img.to_rgba8();
+    let (w, h) = (rgba.width(), rgba.height());
+
+    if w == 0 || h == 0 {
+        return img;
+    }
+
+    // Get corner pixel as reference background color
+    let bg = *rgba.get_pixel(0, 0);
+    let threshold = 30u32;
+
+    let is_bg = |p: &Rgba<u8>| -> bool {
+        let dr = (p[0] as i32 - bg[0] as i32).unsigned_abs();
+        let dg = (p[1] as i32 - bg[1] as i32).unsigned_abs();
+        let db = (p[2] as i32 - bg[2] as i32).unsigned_abs();
+        dr + dg + db < threshold
+    };
+
+    let mut top = 0u32;
+    let mut bottom = h - 1;
+    let mut left = 0u32;
+    let mut right = w - 1;
+
+    // Find top
+    'top: for y in 0..h {
+        for x in 0..w {
+            if !is_bg(rgba.get_pixel(x, y)) {
+                top = y;
+                break 'top;
+            }
+        }
+    }
+
+    // Find bottom
+    'bottom: for y in (0..h).rev() {
+        for x in 0..w {
+            if !is_bg(rgba.get_pixel(x, y)) {
+                bottom = y;
+                break 'bottom;
+            }
+        }
+    }
+
+    // Find left
+    'left: for x in 0..w {
+        for y in top..=bottom {
+            if !is_bg(rgba.get_pixel(x, y)) {
+                left = x;
+                break 'left;
+            }
+        }
+    }
+
+    // Find right
+    'right: for x in (0..w).rev() {
+        for y in top..=bottom {
+            if !is_bg(rgba.get_pixel(x, y)) {
+                right = x;
+                break 'right;
+            }
+        }
+    }
+
+    let crop_w = right.saturating_sub(left).saturating_add(1);
+    let crop_h = bottom.saturating_sub(top).saturating_add(1);
+
+    if crop_w == 0 || crop_h == 0 || (crop_w == w && crop_h == h) {
+        return img;
+    }
+
+    img.crop_imm(left, top, crop_w, crop_h)
+}
+
+fn adjust_saturation(img: DynamicImage, amount: i32) -> DynamicImage {
+    let amount = amount.clamp(-100, 100);
+    let mut rgba = img.into_rgba8();
+    let factor = 1.0 + (amount as f64 / 100.0);
+
+    for pixel in rgba.pixels_mut() {
+        let r = pixel[0] as f64;
+        let g = pixel[1] as f64;
+        let b = pixel[2] as f64;
+
+        let gray = 0.2126 * r + 0.7152 * g + 0.0722 * b;
+
+        pixel[0] = (gray + (r - gray) * factor).clamp(0.0, 255.0) as u8;
+        pixel[1] = (gray + (g - gray) * factor).clamp(0.0, 255.0) as u8;
+        pixel[2] = (gray + (b - gray) * factor).clamp(0.0, 255.0) as u8;
+    }
+
+    DynamicImage::ImageRgba8(rgba)
+}
+
+fn apply_sepia(img: DynamicImage) -> DynamicImage {
+    let mut rgba = img.into_rgba8();
+
+    for pixel in rgba.pixels_mut() {
+        let r = pixel[0] as f64;
+        let g = pixel[1] as f64;
+        let b = pixel[2] as f64;
+
+        pixel[0] = (0.393 * r + 0.769 * g + 0.189 * b).clamp(0.0, 255.0) as u8;
+        pixel[1] = (0.349 * r + 0.686 * g + 0.168 * b).clamp(0.0, 255.0) as u8;
+        pixel[2] = (0.272 * r + 0.534 * g + 0.131 * b).clamp(0.0, 255.0) as u8;
+    }
+
+    DynamicImage::ImageRgba8(rgba)
+}
+
+fn add_canvas_padding(img: DynamicImage, padding: u32) -> DynamicImage {
+    // Cap padding to prevent unreasonable memory allocation
+    let padding = padding.min(10_000);
+    let (w, h) = (img.width(), img.height());
+    let new_w = w.saturating_add(padding.saturating_mul(2)).min(65_535);
+    let new_h = h.saturating_add(padding.saturating_mul(2)).min(65_535);
+
+    let mut canvas = RgbaImage::from_pixel(new_w, new_h, Rgba([255, 255, 255, 255]));
+
+    image::imageops::overlay(&mut canvas, &img.to_rgba8(), padding as i64, padding as i64);
+
+    DynamicImage::ImageRgba8(canvas)
+}

pixstrip-core/src/operations/metadata.rs

@@ -0,0 +1,185 @@
+use std::path::Path;
+
+use crate::error::{PixstripError, Result};
+
+use super::MetadataConfig;
+
+pub fn strip_metadata(
+    input: &Path,
+    output: &Path,
+    config: &MetadataConfig,
+) -> Result<()> {
+    match config {
+        MetadataConfig::KeepAll => {
+            std::fs::copy(input, output).map_err(PixstripError::Io)?;
+        }
+        MetadataConfig::StripAll => {
+            strip_all_exif(input, output)?;
+        }
+        MetadataConfig::Privacy | MetadataConfig::Custom { .. } => {
+            // Copy file first, then selectively strip using little_exif
+            std::fs::copy(input, output).map_err(PixstripError::Io)?;
+            strip_selective_exif(output, config);
+        }
+    }
+    Ok(())
+}
+
+fn strip_selective_exif(path: &Path, config: &MetadataConfig) {
+    use little_exif::exif_tag::ExifTag;
+    use little_exif::metadata::Metadata;
+
+    let Ok(source_meta) = Metadata::new_from_path(path) else {
+        return;
+    };
+
+    let mut strip_ids: Vec<u16> = Vec::new();
+
+    if config.should_strip_gps() {
+        strip_ids.push(ExifTag::GPSInfo(Vec::new()).as_u16());
+    }
+    if config.should_strip_camera() {
+        strip_ids.push(ExifTag::Make(String::new()).as_u16());
+        strip_ids.push(ExifTag::Model(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensModel(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensMake(String::new()).as_u16());
+        strip_ids.push(ExifTag::SerialNumber(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensSerialNumber(String::new()).as_u16());
+        strip_ids.push(ExifTag::LensInfo(Vec::new()).as_u16());
+    }
+    if config.should_strip_software() {
+        strip_ids.push(ExifTag::Software(String::new()).as_u16());
+        strip_ids.push(ExifTag::MakerNote(Vec::new()).as_u16());
+    }
+    if config.should_strip_timestamps() {
+        strip_ids.push(ExifTag::ModifyDate(String::new()).as_u16());
+        strip_ids.push(ExifTag::DateTimeOriginal(String::new()).as_u16());
+        strip_ids.push(ExifTag::CreateDate(String::new()).as_u16());
+        strip_ids.push(ExifTag::SubSecTime(String::new()).as_u16());
+        strip_ids.push(ExifTag::SubSecTimeOriginal(String::new()).as_u16());
+        strip_ids.push(ExifTag::SubSecTimeDigitized(String::new()).as_u16());
+        strip_ids.push(ExifTag::OffsetTime(String::new()).as_u16());
+        strip_ids.push(ExifTag::OffsetTimeOriginal(String::new()).as_u16());
+        strip_ids.push(ExifTag::OffsetTimeDigitized(String::new()).as_u16());
+    }
+    if config.should_strip_copyright() {
+        strip_ids.push(ExifTag::Copyright(String::new()).as_u16());
+        strip_ids.push(ExifTag::Artist(String::new()).as_u16());
+        strip_ids.push(ExifTag::OwnerName(String::new()).as_u16());
+    }
+
+    let mut new_meta = Metadata::new();
+    for tag in source_meta.data() {
+        if !strip_ids.contains(&tag.as_u16()) {
+            new_meta.set_tag(tag.clone());
+        }
+    }
+
+    let _ = new_meta.write_to_file(path);
+}
+
+fn strip_all_exif(input: &Path, output: &Path) -> Result<()> {
+    let data = std::fs::read(input).map_err(PixstripError::Io)?;
+    let cleaned = if data.len() >= 8 && &data[..8] == b"\x89PNG\r\n\x1a\n" {
+        remove_metadata_from_png(&data)
+    } else {
+        remove_exif_from_jpeg(&data)
+    };
+    std::fs::write(output, cleaned).map_err(PixstripError::Io)?;
+    Ok(())
+}
+
+fn remove_exif_from_jpeg(data: &[u8]) -> Vec<u8> {
+    // Only process JPEG files (starts with FF D8)
+    if data.len() < 2 || data[0] != 0xFF || data[1] != 0xD8 {
+        return data.to_vec();
+    }
+
+    let mut result = Vec::with_capacity(data.len());
+    result.push(0xFF);
+    result.push(0xD8);
+
+    let mut i = 2;
+    while i + 1 < data.len() {
+        if data[i] != 0xFF {
+            result.extend_from_slice(&data[i..]);
+            break;
+        }
+
+        let marker = data[i + 1];
+
+        // APP1 (0xE1) contains EXIF - skip it
+        if marker == 0xE1 && i + 3 < data.len() {
+            let len = ((data[i + 2] as usize) << 8) | (data[i + 3] as usize);
+            let skip = 2 + len;
+            if i + skip <= data.len() {
+                i += skip;
+            } else {
+                break;
+            }
+            continue;
+        }
+
+        // SOS (0xDA) - start of scan, copy everything from here
+        if marker == 0xDA {
+            result.extend_from_slice(&data[i..]);
+            break;
+        }
+
+        // Other markers - keep them
+        if i + 3 < data.len() {
+            let len = ((data[i + 2] as usize) << 8) | (data[i + 3] as usize);
+            let end = i + 2 + len;
+            if end <= data.len() {
+                result.extend_from_slice(&data[i..end]);
+                i = end;
+            } else {
+                result.extend_from_slice(&data[i..]);
+                break;
+            }
+        } else {
+            result.extend_from_slice(&data[i..]);
+            break;
+        }
+    }
+
+    result
+}
+
+fn remove_metadata_from_png(data: &[u8]) -> Vec<u8> {
+    // PNG: 8-byte signature + chunks (4 len + 4 type + data + 4 CRC)
+    // Keep only rendering-essential chunks, strip textual/EXIF metadata.
+    const KEEP_CHUNKS: &[&[u8; 4]] = &[
+        b"IHDR", b"PLTE", b"IDAT", b"IEND",
+        b"tRNS", b"gAMA", b"cHRM", b"sRGB", b"iCCP", b"sBIT",
+        b"pHYs", b"bKGD", b"hIST", b"sPLT",
+        b"acTL", b"fcTL", b"fdAT",
+    ];
+
+    if data.len() < 8 {
+        return data.to_vec();
+    }
+
+    let mut result = Vec::with_capacity(data.len());
+    result.extend_from_slice(&data[..8]); // PNG signature
+
+    let mut pos = 8;
+    while pos + 12 <= data.len() {
+        let chunk_len = u32::from_be_bytes([data[pos], data[pos + 1], data[pos + 2], data[pos + 3]]) as usize;
+        let chunk_type = &data[pos + 4..pos + 8];
+        let total = 12 + chunk_len; // 4 len + 4 type + data + 4 CRC
+
+        if pos + total > data.len() {
+            break;
+        }
+
+        let keep = KEEP_CHUNKS.iter().any(|k| *k == chunk_type);
+        if keep {
+            result.extend_from_slice(&data[pos..pos + total]);
+        }
+
+        pos += total;
+    }
+
+    result
+}

pixstrip-core/src/operations/mod.rs

@@ -1 +1,467 @@
-// Image processing operations
+pub mod adjustments;
+pub mod metadata;
+pub mod rename;
+pub mod resize;
+pub mod watermark;
+
+use serde::{Deserialize, Serialize};
+
+use crate::types::{Dimensions, ImageFormat, QualityPreset};
+
+// --- Resize ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum ResizeConfig {
+    ByWidth(u32),
+    ByHeight(u32),
+    FitInBox {
+        max: Dimensions,
+        allow_upscale: bool,
+    },
+    Exact(Dimensions),
+}
+
+impl ResizeConfig {
+    pub fn target_for(&self, original: Dimensions) -> Dimensions {
+        if original.width == 0 || original.height == 0 {
+            return original;
+        }
+        let result = match self {
+            Self::ByWidth(w) => {
+                if *w == 0 {
+                    return original;
+                }
+                let scale = *w as f64 / original.width as f64;
+                Dimensions {
+                    width: *w,
+                    height: (original.height as f64 * scale).round().max(1.0) as u32,
+                }
+            }
+            Self::ByHeight(h) => {
+                if *h == 0 {
+                    return original;
+                }
+                let scale = *h as f64 / original.height as f64;
+                Dimensions {
+                    width: (original.width as f64 * scale).round().max(1.0) as u32,
+                    height: *h,
+                }
+            }
+            Self::FitInBox { max, allow_upscale } => {
+                original.fit_within(*max, *allow_upscale)
+            }
+            Self::Exact(dims) => {
+                if dims.width == 0 || dims.height == 0 {
+                    return original;
+                }
+                *dims
+            }
+        };
+        Dimensions {
+            width: result.width.max(1),
+            height: result.height.max(1),
+        }
+    }
+}
+
+// --- Resize Algorithm ---
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum ResizeAlgorithm {
+    Lanczos3,
+    CatmullRom,
+    Bilinear,
+    Nearest,
+}
+
+impl Default for ResizeAlgorithm {
+    fn default() -> Self {
+        Self::Lanczos3
+    }
+}
+
+// --- Rotation / Flip ---
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum Rotation {
+    None,
+    Cw90,
+    Cw180,
+    Cw270,
+    AutoOrient,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum Flip {
+    None,
+    Horizontal,
+    Vertical,
+}
+
+// --- Convert ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum ConvertConfig {
+    KeepOriginal,
+    SingleFormat(ImageFormat),
+    FormatMapping(Vec<(ImageFormat, ImageFormat)>),
+}
+
+impl ConvertConfig {
+    pub fn output_format(&self, input: ImageFormat) -> ImageFormat {
+        match self {
+            Self::KeepOriginal => input,
+            Self::SingleFormat(fmt) => *fmt,
+            Self::FormatMapping(map) => {
+                map.iter()
+                    .find(|(from, _)| *from == input)
+                    .map(|(_, to)| *to)
+                    .unwrap_or(input)
+            }
+        }
+    }
+
+    /// Returns true if this conversion will change at least some file extensions.
+    pub fn changes_extension(&self) -> bool {
+        !matches!(self, Self::KeepOriginal)
+    }
+}
+
+// --- Compress ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum CompressConfig {
+    Preset(QualityPreset),
+    Custom {
+        jpeg_quality: Option<u8>,
+        png_level: Option<u8>,
+        webp_quality: Option<f32>,
+        avif_quality: Option<f32>,
+    },
+}
+
+// --- Metadata ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum MetadataConfig {
+    StripAll,
+    KeepAll,
+    Privacy,
+    Custom {
+        strip_gps: bool,
+        strip_camera: bool,
+        strip_software: bool,
+        strip_timestamps: bool,
+        strip_copyright: bool,
+    },
+}
+
+impl MetadataConfig {
+    pub fn should_strip_gps(&self) -> bool {
+        match self {
+            Self::StripAll => true,
+            Self::KeepAll => false,
+            Self::Privacy => true,
+            Self::Custom { strip_gps, .. } => *strip_gps,
+        }
+    }
+
+    pub fn should_strip_camera(&self) -> bool {
+        match self {
+            Self::StripAll => true,
+            Self::KeepAll => false,
+            Self::Privacy => true,
+            Self::Custom { strip_camera, .. } => *strip_camera,
+        }
+    }
+
+    pub fn should_strip_copyright(&self) -> bool {
+        match self {
+            Self::StripAll => true,
+            Self::KeepAll => false,
+            Self::Privacy => false,
+            Self::Custom { strip_copyright, .. } => *strip_copyright,
+        }
+    }
+
+    pub fn should_strip_software(&self) -> bool {
+        match self {
+            Self::StripAll => true,
+            Self::KeepAll => false,
+            Self::Privacy => true,
+            Self::Custom { strip_software, .. } => *strip_software,
+        }
+    }
+
+    pub fn should_strip_timestamps(&self) -> bool {
+        match self {
+            Self::StripAll => true,
+            Self::KeepAll => false,
+            Self::Privacy => false,
+            Self::Custom { strip_timestamps, .. } => *strip_timestamps,
+        }
+    }
+}
+
+// --- Watermark ---
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub enum WatermarkPosition {
+    TopLeft,
+    TopCenter,
+    TopRight,
+    MiddleLeft,
+    Center,
+    MiddleRight,
+    BottomLeft,
+    BottomCenter,
+    BottomRight,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum WatermarkConfig {
+    Text {
+        text: String,
+        position: WatermarkPosition,
+        font_size: f32,
+        opacity: f32,
+        color: [u8; 4],
+        font_family: Option<String>,
+        rotation: Option<WatermarkRotation>,
+        tiled: bool,
+        margin: u32,
+    },
+    Image {
+        path: std::path::PathBuf,
+        position: WatermarkPosition,
+        opacity: f32,
+        scale: f32,
+        rotation: Option<WatermarkRotation>,
+        tiled: bool,
+        margin: u32,
+    },
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum WatermarkRotation {
+    Degrees45,
+    DegreesNeg45,
+    Degrees90,
+    Custom(f32),
+}
+
+// --- Adjustments ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AdjustmentsConfig {
+    pub brightness: i32,
+    pub contrast: i32,
+    pub saturation: i32,
+    pub sharpen: bool,
+    pub grayscale: bool,
+    pub sepia: bool,
+    pub crop_aspect_ratio: Option<(f64, f64)>,
+    pub trim_whitespace: bool,
+    pub canvas_padding: u32,
+}
+
+impl AdjustmentsConfig {
+    pub fn is_noop(&self) -> bool {
+        self.brightness == 0
+            && self.contrast == 0
+            && self.saturation == 0
+            && !self.sharpen
+            && !self.grayscale
+            && !self.sepia
+            && self.crop_aspect_ratio.is_none()
+            && !self.trim_whitespace
+            && self.canvas_padding == 0
+    }
+}
+
+// --- Overwrite Action (concrete action, no "Ask" variant) ---
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub enum OverwriteAction {
+    AutoRename,
+    Overwrite,
+    Skip,
+}
+
+impl Default for OverwriteAction {
+    fn default() -> Self {
+        Self::AutoRename
+    }
+}
+
+// --- Rename ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct RenameConfig {
+    pub prefix: String,
+    pub suffix: String,
+    pub counter_start: u32,
+    pub counter_padding: u32,
+    #[serde(default)]
+    pub counter_enabled: bool,
+    /// 0=before prefix, 1=before name, 2=after name, 3=after suffix, 4=replace name
+    #[serde(default = "default_counter_position")]
+    pub counter_position: u32,
+    pub template: Option<String>,
+    /// 0=none, 1=lowercase, 2=uppercase, 3=title case
+    pub case_mode: u32,
+    /// 0=none, 1=underscore, 2=hyphen, 3=dot, 4=camelcase, 5=remove
+    #[serde(default)]
+    pub replace_spaces: u32,
+    /// 0=keep all, 1=filesystem-safe, 2=web-safe, 3=hyphens+underscores, 4=hyphens only, 5=alphanumeric only
+    #[serde(default)]
+    pub special_chars: u32,
+    pub regex_find: String,
+    pub regex_replace: String,
+}
+
+fn default_counter_position() -> u32 { 3 }
+
+impl RenameConfig {
+    /// Returns true if this rename config would actually change any filename.
+    pub fn changes_filename(&self) -> bool {
+        !self.prefix.is_empty()
+            || !self.suffix.is_empty()
+            || self.counter_enabled
+            || !self.regex_find.is_empty()
+            || self.case_mode > 0
+            || self.replace_spaces > 0
+            || self.special_chars > 0
+            || self.template.is_some()
+    }
+
+    /// Pre-compile the regex for batch use. Call once before a loop of apply_simple_compiled.
+    pub fn compile_regex(&self) -> Option<regex::Regex> {
+        rename::compile_rename_regex(&self.regex_find)
+    }
+
+    pub fn apply_simple(&self, original_name: &str, extension: &str, index: u32) -> String {
+        // 1. Apply regex find-and-replace on the original name
+        let working_name = rename::apply_regex_replace(original_name, &self.regex_find, &self.regex_replace);
+
+        // 2. Apply space replacement
+        let working_name = rename::apply_space_replacement(&working_name, self.replace_spaces);
+
+        // 3. Apply special character filtering
+        let working_name = rename::apply_special_chars(&working_name, self.special_chars);
+
+        // 4. Build counter string
+        let counter_str = if self.counter_enabled {
+            let counter = self.counter_start.saturating_add(index.saturating_sub(1));
+            let padding = (self.counter_padding as usize).min(10);
+            format!("{:0>width$}", counter, width = padding)
+        } else {
+            String::new()
+        };
+
+        let has_counter = self.counter_enabled && !counter_str.is_empty();
+
+        // 5. Assemble parts based on counter position
+        // Positions: 0=before prefix, 1=before name, 2=after name, 3=after suffix, 4=replace name
+        let mut result = String::new();
+
+        if has_counter && self.counter_position == 0 {
+            result.push_str(&counter_str);
+            result.push('_');
+        }
+
+        result.push_str(&self.prefix);
+
+        if has_counter && self.counter_position == 1 {
+            result.push_str(&counter_str);
+            result.push('_');
+        }
+
+        if has_counter && self.counter_position == 4 {
+            result.push_str(&counter_str);
+        } else {
+            result.push_str(&working_name);
+        }
+
+        if has_counter && self.counter_position == 2 {
+            result.push('_');
+            result.push_str(&counter_str);
+        }
+
+        result.push_str(&self.suffix);
+
+        if has_counter && self.counter_position == 3 {
+            result.push('_');
+            result.push_str(&counter_str);
+        }
+
+        // 6. Apply case conversion
+        let result = rename::apply_case_conversion(&result, self.case_mode);
+
+        format!("{}.{}", result, extension)
+    }
+
+    /// Like apply_simple but uses a pre-compiled regex (avoids recompiling per file).
+    pub fn apply_simple_compiled(&self, original_name: &str, extension: &str, index: u32, compiled_re: Option<&regex::Regex>) -> String {
+        // 1. Apply regex find-and-replace on the original name
+        let working_name = match compiled_re {
+            Some(re) => rename::apply_regex_replace_compiled(original_name, re, &self.regex_replace),
+            None => original_name.to_string(),
+        };
+
+        // 2. Apply space replacement
+        let working_name = rename::apply_space_replacement(&working_name, self.replace_spaces);
+
+        // 3. Apply special character filtering
+        let working_name = rename::apply_special_chars(&working_name, self.special_chars);
+
+        // 4. Build counter string
+        let counter_str = if self.counter_enabled {
+            let counter = self.counter_start.saturating_add(index.saturating_sub(1));
+            let padding = (self.counter_padding as usize).min(10);
+            format!("{:0>width$}", counter, width = padding)
+        } else {
+            String::new()
+        };
+
+        let has_counter = self.counter_enabled && !counter_str.is_empty();
+
+        // 5. Assemble parts based on counter position
+        let mut result = String::new();
+
+        if has_counter && self.counter_position == 0 {
+            result.push_str(&counter_str);
+            result.push('_');
+        }
+
+        result.push_str(&self.prefix);
+
+        if has_counter && self.counter_position == 1 {
+            result.push_str(&counter_str);
+            result.push('_');
+        }
+
+        if has_counter && self.counter_position == 4 {
+            result.push_str(&counter_str);
+        } else {
+            result.push_str(&working_name);
+        }
+
+        if has_counter && self.counter_position == 2 {
+            result.push('_');
+            result.push_str(&counter_str);
+        }
+
+        result.push_str(&self.suffix);
+
+        if has_counter && self.counter_position == 3 {
+            result.push('_');
+            result.push_str(&counter_str);
+        }
+
+        // 6. Apply case conversion
+        let result = rename::apply_case_conversion(&result, self.case_mode);
+
+        format!("{}.{}", result, extension)
+    }
+}

pixstrip-core/src/operations/rename.rs

@@ -0,0 +1,306 @@
+use std::path::{Path, PathBuf};
+
+pub fn apply_template(
+    template: &str,
+    name: &str,
+    ext: &str,
+    counter: u32,
+    dimensions: Option<(u32, u32)>,
+) -> String {
+    apply_template_full(template, name, ext, counter, dimensions, None, None, None)
+}
+
+pub fn apply_template_full(
+    template: &str,
+    name: &str,
+    ext: &str,
+    counter: u32,
+    dimensions: Option<(u32, u32)>,
+    original_ext: Option<&str>,
+    source_path: Option<&Path>,
+    exif_info: Option<&ExifRenameInfo>,
+) -> String {
+    let mut result = template.to_string();
+
+    result = result.replace("{name}", name);
+    result = result.replace("{ext}", ext);
+    result = result.replace("{original_ext}", original_ext.unwrap_or(ext));
+
+    // Handle {counter:N} with padding
+    if let Some(start) = result.find("{counter:") {
+        if let Some(end) = result[start..].find('}') {
+            let spec = &result[start + 9..start + end];
+            if let Ok(padding) = spec.parse::<usize>() {
+                let padding = padding.min(10);
+                let counter_str = format!("{:0>width$}", counter, width = padding);
+                result = format!("{}{}{}", &result[..start], counter_str, &result[start + end + 1..]);
+            }
+        }
+    } else {
+        result = result.replace("{counter}", &counter.to_string());
+    }
+
+    match dimensions {
+        Some((w, h)) => {
+            result = result.replace("{width}", &w.to_string());
+            result = result.replace("{height}", &h.to_string());
+        }
+        None => {
+            result = result.replace("{width}", "0");
+            result = result.replace("{height}", "0");
+        }
+    }
+
+    // {date} - today's date
+    if result.contains("{date}") {
+        let now = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .unwrap_or_default()
+            .as_secs();
+        let days = now / 86400;
+        // Simple date calculation (good enough for filenames)
+        let (y, m, d) = days_to_ymd(days);
+        result = result.replace("{date}", &format!("{:04}-{:02}-{:02}", y, m, d));
+    }
+
+    // EXIF-based variables
+    if let Some(info) = exif_info {
+        result = result.replace("{exif_date}", &info.date_taken);
+        result = result.replace("{camera}", &info.camera_model);
+    } else if result.contains("{exif_date}") || result.contains("{camera}") {
+        // Try to read EXIF from source file
+        let info = source_path.map(read_exif_rename_info).unwrap_or_default();
+        result = result.replace("{exif_date}", &info.date_taken);
+        result = result.replace("{camera}", &info.camera_model);
+    }
+
+    result
+}
+
+#[derive(Default)]
+pub struct ExifRenameInfo {
+    pub date_taken: String,
+    pub camera_model: String,
+}
+
+fn read_exif_rename_info(path: &Path) -> ExifRenameInfo {
+    let Ok(metadata) = little_exif::metadata::Metadata::new_from_path(path) else {
+        return ExifRenameInfo::default();
+    };
+
+    let mut info = ExifRenameInfo::default();
+    let endian = metadata.get_endian();
+
+    // Read DateTimeOriginal
+    if let Some(tag) = metadata.get_tag(&little_exif::exif_tag::ExifTag::DateTimeOriginal(String::new())) {
+        let bytes = tag.value_as_u8_vec(endian);
+        if let Ok(s) = std::str::from_utf8(&bytes) {
+            // Convert "2026:03:06 14:30:00" to "2026-03-06"
+            let clean = s.trim_end_matches('\0');
+            if let Some(date_part) = clean.split(' ').next() {
+                info.date_taken = date_part.replace(':', "-");
+            }
+        }
+    }
+
+    // Read camera Model
+    if let Some(tag) = metadata.get_tag(&little_exif::exif_tag::ExifTag::Model(String::new())) {
+        let bytes = tag.value_as_u8_vec(endian);
+        if let Ok(s) = std::str::from_utf8(&bytes) {
+            info.camera_model = s.trim_end_matches('\0')
+                .replace(' ', "_")
+                .replace('/', "-")
+                .to_string();
+        }
+    }
+
+    if info.date_taken.is_empty() {
+        info.date_taken = "unknown-date".to_string();
+    }
+    if info.camera_model.is_empty() {
+        info.camera_model = "unknown-camera".to_string();
+    }
+
+    info
+}
+
+fn days_to_ymd(total_days: u64) -> (u64, u64, u64) {
+    // Simplified Gregorian calendar calculation
+    let mut days = total_days;
+    let mut year = 1970u64;
+    loop {
+        if year > 9999 {
+            break;
+        }
+        let days_in_year = if is_leap(year) { 366 } else { 365 };
+        if days < days_in_year {
+            break;
+        }
+        days -= days_in_year;
+        year += 1;
+    }
+    let months_days: [u64; 12] = if is_leap(year) {
+        [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+    } else {
+        [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
+    };
+    let mut month = 1u64;
+    for md in &months_days {
+        if days < *md {
+            break;
+        }
+        days -= md;
+        month += 1;
+    }
+    (year, month, days + 1)
+}
+
+fn is_leap(year: u64) -> bool {
+    (year % 4 == 0 && year % 100 != 0) || year % 400 == 0
+}
+
+/// Apply space replacement on a filename
+/// mode: 0=none, 1=underscore, 2=hyphen, 3=dot, 4=camelcase, 5=remove
+pub fn apply_space_replacement(name: &str, mode: u32) -> String {
+    match mode {
+        1 => name.replace(' ', "_"),
+        2 => name.replace(' ', "-"),
+        3 => name.replace(' ', "."),
+        4 => {
+            let mut result = String::with_capacity(name.len());
+            let mut capitalize_next = false;
+            for ch in name.chars() {
+                if ch == ' ' {
+                    capitalize_next = true;
+                } else if capitalize_next {
+                    result.extend(ch.to_uppercase());
+                    capitalize_next = false;
+                } else {
+                    result.push(ch);
+                }
+            }
+            result
+        }
+        5 => name.replace(' ', ""),
+        _ => name.to_string(),
+    }
+}
+
+/// Apply special character filtering on a filename
+/// mode: 0=keep all, 1=filesystem-safe, 2=web-safe, 3=hyphens+underscores, 4=hyphens only, 5=alphanumeric only
+pub fn apply_special_chars(name: &str, mode: u32) -> String {
+    match mode {
+        1 => name.chars().filter(|c| !matches!(c, '/' | '\\' | ':' | '*' | '?' | '"' | '<' | '>' | '|')).collect(),
+        2 => name.chars().filter(|c| c.is_ascii_alphanumeric() || matches!(c, '-' | '_' | '.')).collect(),
+        3 => name.chars().filter(|c| c.is_ascii_alphanumeric() || matches!(c, '-' | '_')).collect(),
+        4 => name.chars().filter(|c| c.is_ascii_alphanumeric() || *c == '-').collect(),
+        5 => name.chars().filter(|c| c.is_ascii_alphanumeric()).collect(),
+        _ => name.to_string(),
+    }
+}
+
+/// Apply case conversion to a filename (without extension)
+/// case_mode: 0=none, 1=lowercase, 2=uppercase, 3=title case
+pub fn apply_case_conversion(name: &str, case_mode: u32) -> String {
+    match case_mode {
+        1 => name.to_lowercase(),
+        2 => name.to_uppercase(),
+        3 => {
+            // Title case: capitalize first letter of each word, preserve original separators
+            let mut result = String::with_capacity(name.len());
+            let mut capitalize_next = true;
+            for c in name.chars() {
+                if c == '_' || c == '-' || c == ' ' {
+                    result.push(c);
+                    capitalize_next = true;
+                } else if capitalize_next {
+                    for uc in c.to_uppercase() {
+                        result.push(uc);
+                    }
+                    capitalize_next = false;
+                } else {
+                    for lc in c.to_lowercase() {
+                        result.push(lc);
+                    }
+                }
+            }
+            result
+        }
+        _ => name.to_string(),
+    }
+}
+
+/// Pre-compile a regex for batch use. Returns None (with message) if invalid.
+pub fn compile_rename_regex(find: &str) -> Option<regex::Regex> {
+    if find.is_empty() {
+        return None;
+    }
+    regex::RegexBuilder::new(find)
+        .size_limit(1 << 16)
+        .dfa_size_limit(1 << 16)
+        .build()
+        .ok()
+}
+
+/// Apply regex find-and-replace on a filename
+pub fn apply_regex_replace(name: &str, find: &str, replace: &str) -> String {
+    if find.is_empty() {
+        return name.to_string();
+    }
+    match regex::RegexBuilder::new(find)
+        .size_limit(1 << 16)
+        .dfa_size_limit(1 << 16)
+        .build()
+    {
+        Ok(re) => re.replace_all(name, replace).into_owned(),
+        Err(_) => name.to_string(),
+    }
+}
+
+/// Apply a pre-compiled regex find-and-replace on a filename
+pub fn apply_regex_replace_compiled(name: &str, re: &regex::Regex, replace: &str) -> String {
+    re.replace_all(name, replace).into_owned()
+}
+
+pub fn resolve_collision(path: &Path) -> PathBuf {
+    // Use create_new (O_CREAT|O_EXCL) for atomic reservation, preventing TOCTOU races
+    match std::fs::OpenOptions::new().write(true).create_new(true).open(path) {
+        Ok(_) => return path.to_path_buf(),
+        Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => {}
+        Err(_) => return path.to_path_buf(), // other errors (e.g. permission) - let caller handle
+    }
+
+    let parent = path.parent().unwrap_or(Path::new("."));
+    let stem = path
+        .file_stem()
+        .and_then(|s| s.to_str())
+        .unwrap_or("file");
+    let ext = path
+        .extension()
+        .and_then(|e| e.to_str())
+        .unwrap_or("");
+
+    for i in 1..1000 {
+        let candidate = if ext.is_empty() {
+            parent.join(format!("{}_{}", stem, i))
+        } else {
+            parent.join(format!("{}_{}.{}", stem, i, ext))
+        };
+        match std::fs::OpenOptions::new().write(true).create_new(true).open(&candidate) {
+            Ok(_) => return candidate,
+            Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => continue,
+            Err(_) => continue,
+        }
+    }
+
+    // Fallback with timestamp for uniqueness
+    let ts = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_millis())
+        .unwrap_or(0);
+    if ext.is_empty() {
+        parent.join(format!("{}_{}", stem, ts))
+    } else {
+        parent.join(format!("{}_{}.{}", stem, ts, ext))
+    }
+}

pixstrip-core/src/operations/resize.rs

@@ -0,0 +1,74 @@
+use fast_image_resize::{images::Image, Resizer, ResizeOptions, ResizeAlg, FilterType};
+
+use crate::error::{PixstripError, Result};
+use crate::types::Dimensions;
+
+use super::{ResizeConfig, ResizeAlgorithm};
+
+pub fn resize_image(
+    src: &image::DynamicImage,
+    config: &ResizeConfig,
+) -> Result<image::DynamicImage> {
+    resize_image_with_algorithm(src, config, ResizeAlgorithm::default())
+}
+
+pub fn resize_image_with_algorithm(
+    src: &image::DynamicImage,
+    config: &ResizeConfig,
+    algorithm: ResizeAlgorithm,
+) -> Result<image::DynamicImage> {
+    let original = Dimensions {
+        width: src.width(),
+        height: src.height(),
+    };
+    let target = config.target_for(original);
+
+    if target.width == original.width && target.height == original.height {
+        return Ok(src.clone());
+    }
+
+    let src_rgba = src.to_rgba8();
+    let (src_w, src_h) = (src_rgba.width(), src_rgba.height());
+
+    let src_image = Image::from_vec_u8(
+        src_w,
+        src_h,
+        src_rgba.into_raw(),
+        fast_image_resize::PixelType::U8x4,
+    )
+    .map_err(|e| PixstripError::Processing {
+        operation: "resize".into(),
+        reason: format!("Failed to create source image: {}", e),
+    })?;
+
+    let mut dst_image = Image::new(
+        target.width,
+        target.height,
+        fast_image_resize::PixelType::U8x4,
+    );
+
+    let mut resizer = Resizer::new();
+    let alg = match algorithm {
+        ResizeAlgorithm::Lanczos3 => ResizeAlg::Convolution(FilterType::Lanczos3),
+        ResizeAlgorithm::CatmullRom => ResizeAlg::Convolution(FilterType::CatmullRom),
+        ResizeAlgorithm::Bilinear => ResizeAlg::Convolution(FilterType::Bilinear),
+        ResizeAlgorithm::Nearest => ResizeAlg::Nearest,
+    };
+    let options = ResizeOptions::new().resize_alg(alg);
+
+    resizer
+        .resize(&src_image, &mut dst_image, &options)
+        .map_err(|e| PixstripError::Processing {
+            operation: "resize".into(),
+            reason: format!("Resize failed: {}", e),
+        })?;
+
+    let result_buf: image::RgbaImage =
+        image::ImageBuffer::from_raw(target.width, target.height, dst_image.into_vec())
+            .ok_or_else(|| PixstripError::Processing {
+                operation: "resize".into(),
+                reason: "Failed to create output image buffer".into(),
+            })?;
+
+    Ok(image::DynamicImage::ImageRgba8(result_buf))
+}

pixstrip-core/src/operations/watermark.rs

@@ -0,0 +1,537 @@
+use image::{DynamicImage, Rgba};
+use imageproc::drawing::draw_text_mut;
+
+use crate::error::{PixstripError, Result};
+use crate::types::Dimensions;
+
+use super::{WatermarkConfig, WatermarkPosition};
+
+pub fn calculate_position(
+    position: WatermarkPosition,
+    image_size: Dimensions,
+    watermark_size: Dimensions,
+    margin: u32,
+) -> (u32, u32) {
+    let iw = image_size.width;
+    let ih = image_size.height;
+    let ww = watermark_size.width;
+    let wh = watermark_size.height;
+
+    let center_x = iw.saturating_sub(ww) / 2;
+    let center_y = ih.saturating_sub(wh) / 2;
+    let right_x = iw.saturating_sub(ww).saturating_sub(margin);
+    let bottom_y = ih.saturating_sub(wh).saturating_sub(margin);
+
+    match position {
+        WatermarkPosition::TopLeft => (margin, margin),
+        WatermarkPosition::TopCenter => (center_x, margin),
+        WatermarkPosition::TopRight => (right_x, margin),
+        WatermarkPosition::MiddleLeft => (margin, center_y),
+        WatermarkPosition::Center => (center_x, center_y),
+        WatermarkPosition::MiddleRight => (right_x, center_y),
+        WatermarkPosition::BottomLeft => (margin, bottom_y),
+        WatermarkPosition::BottomCenter => (center_x, bottom_y),
+        WatermarkPosition::BottomRight => (right_x, bottom_y),
+    }
+}
+
+pub fn apply_watermark(
+    img: DynamicImage,
+    config: &WatermarkConfig,
+) -> Result<DynamicImage> {
+    match config {
+        WatermarkConfig::Text {
+            text,
+            position,
+            font_size,
+            opacity,
+            color,
+            font_family,
+            rotation,
+            tiled,
+            margin,
+        } => {
+            if *tiled {
+                apply_tiled_text_watermark(img, text, *font_size, *opacity, *color, font_family.as_deref(), *rotation, *margin)
+            } else {
+                apply_text_watermark(img, text, *position, *font_size, *opacity, *color, font_family.as_deref(), *rotation, *margin)
+            }
+        }
+        WatermarkConfig::Image {
+            path,
+            position,
+            opacity,
+            scale,
+            rotation,
+            tiled,
+            margin,
+        } => {
+            if *tiled {
+                apply_tiled_image_watermark(img, path, *opacity, *scale, *rotation, *margin)
+            } else {
+                apply_image_watermark(img, path, *position, *opacity, *scale, *rotation, *margin)
+            }
+        }
+    }
+}
+
+/// Cache for font data to avoid repeated filesystem walks during preview updates
+static FONT_CACHE: std::sync::Mutex<Option<FontCache>> = std::sync::Mutex::new(None);
+static DEFAULT_FONT_CACHE: std::sync::OnceLock<Option<Vec<u8>>> = std::sync::OnceLock::new();
+
+struct FontCache {
+    entries: std::collections::HashMap<String, Vec<u8>>,
+}
+
+fn find_system_font(family: Option<&str>) -> Result<Vec<u8>> {
+    // If a specific font family was requested, check the cache first
+    if let Some(name) = family {
+        if !name.is_empty() {
+            let name_lower = name.to_lowercase();
+
+            // Check cache
+            if let Ok(cache) = FONT_CACHE.lock() {
+                if let Some(ref c) = *cache {
+                    if let Some(data) = c.entries.get(&name_lower) {
+                        return Ok(data.clone());
+                    }
+                }
+            }
+
+            // Cache miss - search filesystem
+            let search_dirs = [
+                "/usr/share/fonts",
+                "/usr/local/share/fonts",
+            ];
+            for dir in &search_dirs {
+                if let Ok(entries) = walkdir(std::path::Path::new(dir)) {
+                    for path in entries {
+                        let file_name = path.file_name()
+                            .and_then(|n| n.to_str())
+                            .unwrap_or("")
+                            .to_lowercase();
+                        if file_name.contains(&name_lower)
+                            && (file_name.ends_with(".ttf") || file_name.ends_with(".otf"))
+                            && (file_name.contains("regular") || (!file_name.contains("bold") && !file_name.contains("italic")))
+                        {
+                            if let Ok(data) = std::fs::read(&path) {
+                                // Store in cache
+                                if let Ok(mut cache) = FONT_CACHE.lock() {
+                                    let c = cache.get_or_insert_with(|| FontCache {
+                                        entries: std::collections::HashMap::new(),
+                                    });
+                                    c.entries.insert(name_lower, data.clone());
+                                }
+                                return Ok(data);
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    // Fall back to default system fonts (cached via OnceLock)
+    let default = DEFAULT_FONT_CACHE.get_or_init(|| {
+        let candidates = [
+            "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",
+            "/usr/share/fonts/TTF/DejaVuSans.ttf",
+            "/usr/share/fonts/dejavu-sans-fonts/DejaVuSans.ttf",
+            "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf",
+            "/usr/share/fonts/truetype/noto/NotoSans-Regular.ttf",
+            "/usr/share/fonts/noto/NotoSans-Regular.ttf",
+        ];
+        for path in &candidates {
+            if let Ok(data) = std::fs::read(path) {
+                return Some(data);
+            }
+        }
+        None
+    });
+
+    match default {
+        Some(data) => Ok(data.clone()),
+        None => Err(PixstripError::Processing {
+            operation: "watermark".into(),
+            reason: "No system font found for text watermark".into(),
+        }),
+    }
+}
+
+/// Recursively walk a directory and collect file paths (max depth 5)
+fn walkdir(dir: &std::path::Path) -> std::io::Result<Vec<std::path::PathBuf>> {
+    walkdir_depth(dir, 5)
+}
+
+fn walkdir_depth(dir: &std::path::Path, max_depth: u32) -> std::io::Result<Vec<std::path::PathBuf>> {
+    const MAX_RESULTS: usize = 10_000;
+    let mut results = Vec::new();
+    walkdir_depth_inner(dir, max_depth, &mut results, MAX_RESULTS);
+    Ok(results)
+}
+
+fn walkdir_depth_inner(dir: &std::path::Path, max_depth: u32, results: &mut Vec<std::path::PathBuf>, max: usize) {
+    if max_depth == 0 || !dir.is_dir() || results.len() >= max {
+        return;
+    }
+    let Ok(entries) = std::fs::read_dir(dir) else { return };
+    for entry in entries {
+        if results.len() >= max {
+            break;
+        }
+        let Ok(entry) = entry else { continue };
+        let path = entry.path();
+        if path.is_dir() {
+            walkdir_depth_inner(&path, max_depth - 1, results, max);
+        } else {
+            results.push(path);
+        }
+    }
+}
+
+/// Estimate text dimensions for a given string and font size.
+/// Returns (width, height) in pixels.
+fn estimate_text_dimensions(text: &str, font_size: f32) -> (u32, u32) {
+    let w = ((text.chars().count().min(10_000) as f32 * font_size.min(1000.0) * 0.6) as u32)
+        .saturating_add(4)
+        .min(16384);
+    let h = ((font_size.min(1000.0) * 1.4) as u32)
+        .saturating_add(4)
+        .min(4096);
+    (w, h)
+}
+
+/// Render text onto a transparent RGBA buffer and return it as a DynamicImage
+fn render_text_to_image(
+    text: &str,
+    font: &ab_glyph::FontArc,
+    font_size: f32,
+    color: [u8; 4],
+    opacity: f32,
+) -> image::RgbaImage {
+    let scale = ab_glyph::PxScale::from(font_size);
+    let (text_width, text_height) = estimate_text_dimensions(text, font_size);
+
+    let alpha = (opacity * 255.0).clamp(0.0, 255.0) as u8;
+    let draw_color = Rgba([color[0], color[1], color[2], alpha]);
+
+    let mut buf = image::RgbaImage::new(text_width.max(1), text_height.max(1));
+    draw_text_mut(&mut buf, draw_color, 2, 2, scale, font, text);
+    buf
+}
+
+/// Expand canvas so rotated content fits without clipping, then rotate
+fn rotate_on_expanded_canvas(img: &image::RgbaImage, radians: f32) -> DynamicImage {
+    let w = img.width() as f32;
+    let h = img.height() as f32;
+    let cos = radians.abs().cos();
+    let sin = radians.abs().sin();
+    // Bounding box of rotated rectangle
+    let new_w = (w * cos + h * sin).ceil() as u32 + 2;
+    let new_h = (w * sin + h * cos).ceil() as u32 + 2;
+
+    // Place original in center of expanded transparent canvas
+    let mut expanded = image::RgbaImage::new(new_w, new_h);
+    let ox = (new_w.saturating_sub(img.width())) / 2;
+    let oy = (new_h.saturating_sub(img.height())) / 2;
+    image::imageops::overlay(&mut expanded, img, ox as i64, oy as i64);
+
+    imageproc::geometric_transformations::rotate_about_center(
+        &expanded,
+        radians,
+        imageproc::geometric_transformations::Interpolation::Bilinear,
+        Rgba([0, 0, 0, 0]),
+    ).into()
+}
+
+/// Rotate an RGBA image by the given WatermarkRotation
+fn rotate_watermark_image(
+    img: DynamicImage,
+    rotation: super::WatermarkRotation,
+) -> DynamicImage {
+    match rotation {
+        super::WatermarkRotation::Degrees90 => img.rotate90(),
+        super::WatermarkRotation::Degrees45 => {
+            rotate_on_expanded_canvas(&img.to_rgba8(), std::f32::consts::FRAC_PI_4)
+        }
+        super::WatermarkRotation::DegreesNeg45 => {
+            rotate_on_expanded_canvas(&img.to_rgba8(), -std::f32::consts::FRAC_PI_4)
+        }
+        super::WatermarkRotation::Custom(degrees) => {
+            rotate_on_expanded_canvas(&img.to_rgba8(), degrees.to_radians())
+        }
+    }
+}
+
+fn apply_text_watermark(
+    img: DynamicImage,
+    text: &str,
+    position: WatermarkPosition,
+    font_size: f32,
+    opacity: f32,
+    color: [u8; 4],
+    font_family: Option<&str>,
+    rotation: Option<super::WatermarkRotation>,
+    margin_px: u32,
+) -> Result<DynamicImage> {
+    if text.is_empty() {
+        return Ok(img);
+    }
+    let font_data = find_system_font(font_family)?;
+    let font = ab_glyph::FontArc::try_from_vec(font_data).map_err(|_| {
+        PixstripError::Processing {
+            operation: "watermark".into(),
+            reason: "Failed to load font".into(),
+        }
+    })?;
+
+    if let Some(rot) = rotation {
+        // Render text to buffer, rotate, then overlay
+        let text_buf = render_text_to_image(text, &font, font_size, color, opacity);
+        let rotated = rotate_watermark_image(DynamicImage::ImageRgba8(text_buf), rot);
+
+        let wm_dims = Dimensions {
+            width: rotated.width(),
+            height: rotated.height(),
+        };
+        let image_dims = Dimensions {
+            width: img.width(),
+            height: img.height(),
+        };
+        let margin = if margin_px > 0 { margin_px } else { (font_size * 0.5) as u32 };
+        let (x, y) = calculate_position(position, image_dims, wm_dims, margin);
+
+        let mut rgba = img.into_rgba8();
+        image::imageops::overlay(&mut rgba, &rotated.to_rgba8(), x as i64, y as i64);
+        Ok(DynamicImage::ImageRgba8(rgba))
+    } else {
+        // No rotation - draw text directly (faster)
+        let scale = ab_glyph::PxScale::from(font_size);
+        let (tw, th) = estimate_text_dimensions(text, font_size);
+        let text_dims = Dimensions {
+            width: tw,
+            height: th,
+        };
+        let image_dims = Dimensions {
+            width: img.width(),
+            height: img.height(),
+        };
+        let margin = if margin_px > 0 { margin_px } else { (font_size * 0.5) as u32 };
+        let (x, y) = calculate_position(position, image_dims, text_dims, margin);
+
+        let alpha = (opacity * 255.0).clamp(0.0, 255.0) as u8;
+        let draw_color = Rgba([color[0], color[1], color[2], alpha]);
+
+        let mut rgba = img.into_rgba8();
+        draw_text_mut(&mut rgba, draw_color, x as i32, y as i32, scale, &font, text);
+        Ok(DynamicImage::ImageRgba8(rgba))
+    }
+}
+
+fn apply_tiled_text_watermark(
+    img: DynamicImage,
+    text: &str,
+    font_size: f32,
+    opacity: f32,
+    color: [u8; 4],
+    font_family: Option<&str>,
+    rotation: Option<super::WatermarkRotation>,
+    margin: u32,
+) -> Result<DynamicImage> {
+    if text.is_empty() {
+        return Ok(img);
+    }
+    let font_data = find_system_font(font_family)?;
+    let font = ab_glyph::FontArc::try_from_vec(font_data).map_err(|_| {
+        PixstripError::Processing {
+            operation: "watermark".into(),
+            reason: "Failed to load font".into(),
+        }
+    })?;
+
+    let spacing = margin.max(20);
+    let mut rgba = img.into_rgba8();
+    let (iw, ih) = (rgba.width(), rgba.height());
+
+    if let Some(rot) = rotation {
+        // Render a single tile, rotate it, then tile across the image
+        let tile_buf = render_text_to_image(text, &font, font_size, color, opacity);
+        let rotated = rotate_watermark_image(DynamicImage::ImageRgba8(tile_buf), rot);
+        let tile = rotated.to_rgba8();
+        let tw = tile.width();
+        let th = tile.height();
+
+        let mut y: i64 = 0;
+        while y < ih as i64 {
+            let mut x: i64 = 0;
+            while x < iw as i64 {
+                image::imageops::overlay(&mut rgba, &tile, x, y);
+                x += tw as i64 + spacing as i64;
+            }
+            y += th as i64 + spacing as i64;
+        }
+    } else {
+        // No rotation - draw text directly (faster)
+        let scale = ab_glyph::PxScale::from(font_size);
+        let alpha = (opacity * 255.0).clamp(0.0, 255.0) as u8;
+        let draw_color = Rgba([color[0], color[1], color[2], alpha]);
+
+        let (text_width, text_height) = estimate_text_dimensions(text, font_size);
+
+        let mut y: i64 = 0;
+        while y < ih as i64 {
+            let mut x: i64 = 0;
+            while x < iw as i64 {
+                draw_text_mut(&mut rgba, draw_color, x as i32, y as i32, scale, &font, text);
+                x += text_width as i64 + spacing as i64;
+            }
+            y += text_height as i64 + spacing as i64;
+        }
+    }
+
+    Ok(DynamicImage::ImageRgba8(rgba))
+}
+
+fn apply_tiled_image_watermark(
+    img: DynamicImage,
+    watermark_path: &std::path::Path,
+    opacity: f32,
+    scale: f32,
+    rotation: Option<super::WatermarkRotation>,
+    margin: u32,
+) -> Result<DynamicImage> {
+    let watermark = image::open(watermark_path).map_err(|e| PixstripError::Processing {
+        operation: "watermark".into(),
+        reason: format!("Failed to load watermark image: {}", e),
+    })?;
+
+    let safe_scale = if scale.is_finite() && scale > 0.0 { scale } else { 1.0 };
+    let wm_width = ((watermark.width() as f32 * safe_scale) as u32).clamp(1, 16384);
+    let wm_height = ((watermark.height() as f32 * safe_scale) as u32).clamp(1, 16384);
+
+    let mut watermark = watermark.resize_exact(wm_width, wm_height, image::imageops::FilterType::Lanczos3);
+    if let Some(rot) = rotation {
+        watermark = rotate_watermark_image(watermark, rot);
+    }
+    let overlay = watermark.to_rgba8();
+    let ow = overlay.width();
+    let oh = overlay.height();
+    let alpha_factor = opacity.clamp(0.0, 1.0);
+    let spacing = margin.max(10);
+
+    let mut base = img.into_rgba8();
+    let (iw, ih) = (base.width(), base.height());
+
+    let mut ty = 0u32;
+    while ty < ih {
+        let mut tx = 0u32;
+        while tx < iw {
+            for oy in 0..oh {
+                for ox in 0..ow {
+                    let px = tx + ox;
+                    let py = ty + oy;
+                    if px < iw && py < ih {
+                        let wm_pixel = overlay.get_pixel(ox, oy);
+                        let base_pixel = base.get_pixel(px, py);
+                        let wm_alpha = (wm_pixel[3] as f32 / 255.0) * alpha_factor;
+                        let base_alpha = base_pixel[3] as f32 / 255.0;
+                        let out_alpha = wm_alpha + base_alpha * (1.0 - wm_alpha);
+                        if out_alpha > 0.0 {
+                            let r = ((wm_pixel[0] as f32 * wm_alpha + base_pixel[0] as f32 * base_alpha * (1.0 - wm_alpha)) / out_alpha) as u8;
+                            let g = ((wm_pixel[1] as f32 * wm_alpha + base_pixel[1] as f32 * base_alpha * (1.0 - wm_alpha)) / out_alpha) as u8;
+                            let b = ((wm_pixel[2] as f32 * wm_alpha + base_pixel[2] as f32 * base_alpha * (1.0 - wm_alpha)) / out_alpha) as u8;
+                            let a = (out_alpha * 255.0) as u8;
+                            base.put_pixel(px, py, Rgba([r, g, b, a]));
+                        }
+                    }
+                }
+            }
+            tx += ow + spacing;
+        }
+        ty += oh + spacing;
+    }
+
+    Ok(DynamicImage::ImageRgba8(base))
+}
+
+fn apply_image_watermark(
+    img: DynamicImage,
+    watermark_path: &std::path::Path,
+    position: WatermarkPosition,
+    opacity: f32,
+    scale: f32,
+    rotation: Option<super::WatermarkRotation>,
+    margin: u32,
+) -> Result<DynamicImage> {
+    let watermark = image::open(watermark_path).map_err(|e| PixstripError::Processing {
+        operation: "watermark".into(),
+        reason: format!("Failed to load watermark image: {}", e),
+    })?;
+
+    // Scale the watermark (capped to prevent OOM on extreme scale values)
+    let safe_scale = if scale.is_finite() && scale > 0.0 { scale } else { 1.0 };
+    let wm_width = ((watermark.width() as f32 * safe_scale) as u32).clamp(1, 16384);
+    let wm_height = ((watermark.height() as f32 * safe_scale) as u32).clamp(1, 16384);
+
+    let mut watermark = watermark.resize_exact(
+        wm_width,
+        wm_height,
+        image::imageops::FilterType::Lanczos3,
+    );
+
+    if let Some(rot) = rotation {
+        watermark = rotate_watermark_image(watermark, rot);
+    }
+
+    let image_dims = Dimensions {
+        width: img.width(),
+        height: img.height(),
+    };
+    let wm_dims = Dimensions {
+        width: watermark.width(),
+        height: watermark.height(),
+    };
+
+    let (x, y) = calculate_position(position, image_dims, wm_dims, margin);
+
+    let mut base = img.into_rgba8();
+    let overlay = watermark.to_rgba8();
+    let ow = overlay.width();
+    let oh = overlay.height();
+
+    let alpha_factor = opacity.clamp(0.0, 1.0);
+
+    for oy in 0..oh {
+        for ox in 0..ow {
+            let px = x + ox;
+            let py = y + oy;
+
+            if px < base.width() && py < base.height() {
+                let wm_pixel = overlay.get_pixel(ox, oy);
+                let base_pixel = base.get_pixel(px, py);
+
+                let wm_alpha = (wm_pixel[3] as f32 / 255.0) * alpha_factor;
+                let base_alpha = base_pixel[3] as f32 / 255.0;
+
+                let out_alpha = wm_alpha + base_alpha * (1.0 - wm_alpha);
+
+                if out_alpha > 0.0 {
+                    let r = ((wm_pixel[0] as f32 * wm_alpha
+                        + base_pixel[0] as f32 * base_alpha * (1.0 - wm_alpha))
+                        / out_alpha) as u8;
+                    let g = ((wm_pixel[1] as f32 * wm_alpha
+                        + base_pixel[1] as f32 * base_alpha * (1.0 - wm_alpha))
+                        / out_alpha) as u8;
+                    let b = ((wm_pixel[2] as f32 * wm_alpha
+                        + base_pixel[2] as f32 * base_alpha * (1.0 - wm_alpha))
+                        / out_alpha) as u8;
+                    let a = (out_alpha * 255.0) as u8;
+
+                    base.put_pixel(px, py, Rgba([r, g, b, a]));
+                }
+            }
+        }
+    }
+
+    Ok(DynamicImage::ImageRgba8(base))
+}

pixstrip-core/src/pipeline.rs

@@ -1 +1,122 @@
-// Processing pipeline
+use std::path::{Path, PathBuf};
+
+use serde::{Deserialize, Serialize};
+
+use crate::operations::*;
+use crate::types::{ImageFormat, ImageSource};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ProcessingJob {
+    pub input_dir: PathBuf,
+    pub output_dir: PathBuf,
+    #[serde(skip)]
+    pub sources: Vec<ImageSource>,
+    pub resize: Option<ResizeConfig>,
+    pub resize_algorithm: ResizeAlgorithm,
+    pub rotation: Option<Rotation>,
+    pub flip: Option<Flip>,
+    pub adjustments: Option<AdjustmentsConfig>,
+    pub convert: Option<ConvertConfig>,
+    pub compress: Option<CompressConfig>,
+    pub metadata: Option<MetadataConfig>,
+    pub watermark: Option<WatermarkConfig>,
+    pub rename: Option<RenameConfig>,
+    pub overwrite_behavior: OverwriteAction,
+    pub preserve_directory_structure: bool,
+    pub progressive_jpeg: bool,
+    pub avif_speed: u8,
+    pub output_dpi: u32,
+}
+
+impl ProcessingJob {
+    pub fn new(input_dir: impl AsRef<Path>, output_dir: impl AsRef<Path>) -> Self {
+        Self {
+            input_dir: input_dir.as_ref().to_path_buf(),
+            output_dir: output_dir.as_ref().to_path_buf(),
+            sources: Vec::new(),
+            resize: None,
+            resize_algorithm: ResizeAlgorithm::default(),
+            rotation: None,
+            flip: None,
+            adjustments: None,
+            convert: None,
+            compress: None,
+            metadata: None,
+            watermark: None,
+            rename: None,
+            overwrite_behavior: OverwriteAction::default(),
+            preserve_directory_structure: false,
+            progressive_jpeg: false,
+            avif_speed: 6,
+            output_dpi: 0,
+        }
+    }
+
+    pub fn add_source(&mut self, path: impl AsRef<Path>) {
+        self.sources.push(ImageSource::from_path(path));
+    }
+
+    pub fn operation_count(&self) -> usize {
+        let mut count = 0;
+        if self.resize.is_some() { count += 1; }
+        if self.rotation.is_some() { count += 1; }
+        if self.flip.is_some() { count += 1; }
+        if self.adjustments.as_ref().is_some_and(|a| !a.is_noop()) { count += 1; }
+        if self.convert.is_some() { count += 1; }
+        if self.compress.is_some() { count += 1; }
+        if self.metadata.is_some() { count += 1; }
+        if self.watermark.is_some() { count += 1; }
+        if self.rename.is_some() { count += 1; }
+        count
+    }
+
+    /// Returns true if the job requires decoding/encoding pixel data.
+    /// When false, we can use a fast copy-and-rename path.
+    pub fn needs_pixel_processing(&self) -> bool {
+        self.resize.is_some()
+            || matches!(self.rotation, Some(r) if !matches!(r, Rotation::None))
+            || matches!(self.flip, Some(f) if !matches!(f, Flip::None))
+            || self.adjustments.as_ref().is_some_and(|a| !a.is_noop())
+            || self.convert.is_some()
+            || self.compress.is_some()
+            || self.watermark.is_some()
+            || self.output_dpi > 0
+    }
+
+    pub fn output_path_for(
+        &self,
+        source: &ImageSource,
+        output_format: Option<ImageFormat>,
+    ) -> PathBuf {
+        let stem = source
+            .path
+            .file_stem()
+            .and_then(|s| s.to_str())
+            .unwrap_or("output");
+
+        let ext = output_format
+            .map(|f| f.extension())
+            .or_else(|| {
+                source
+                    .path
+                    .extension()
+                    .and_then(|e| e.to_str())
+            })
+            .unwrap_or("bin");
+
+        let filename = format!("{}.{}", stem, ext);
+
+        if self.preserve_directory_structure {
+            // Maintain relative path from input_dir
+            if let Ok(rel) = source.path.strip_prefix(&self.input_dir) {
+                if let Some(parent) = rel.parent() {
+                    if parent.components().count() > 0 {
+                        return self.output_dir.join(parent).join(filename);
+                    }
+                }
+            }
+        }
+
+        self.output_dir.join(filename)
+    }
+}

pixstrip-core/src/preset.rs

@@ -1 +1,289 @@
-// Preset management
+use serde::{Deserialize, Serialize};
+
+use crate::operations::*;
+use crate::pipeline::ProcessingJob;
+use crate::types::*;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(default)]
+pub struct Preset {
+    pub name: String,
+    pub description: String,
+    pub icon: String,
+    pub icon_color: String,
+    pub is_custom: bool,
+    pub resize: Option<ResizeConfig>,
+    pub rotation: Option<Rotation>,
+    pub flip: Option<Flip>,
+    pub convert: Option<ConvertConfig>,
+    pub compress: Option<CompressConfig>,
+    pub metadata: Option<MetadataConfig>,
+    pub watermark: Option<WatermarkConfig>,
+    pub rename: Option<RenameConfig>,
+}
+
+impl Default for Preset {
+    fn default() -> Self {
+        Self {
+            name: String::new(),
+            description: String::new(),
+            icon: "image-x-generic-symbolic".into(),
+            icon_color: String::new(),
+            is_custom: true,
+            resize: None,
+            rotation: None,
+            flip: None,
+            convert: None,
+            compress: None,
+            metadata: None,
+            watermark: None,
+            rename: None,
+        }
+    }
+}
+
+impl Preset {
+    pub fn to_job(
+        &self,
+        input_dir: impl Into<std::path::PathBuf>,
+        output_dir: impl Into<std::path::PathBuf>,
+    ) -> ProcessingJob {
+        ProcessingJob {
+            input_dir: input_dir.into(),
+            output_dir: output_dir.into(),
+            sources: Vec::new(),
+            resize: self.resize.clone(),
+            resize_algorithm: crate::operations::ResizeAlgorithm::default(),
+            rotation: self.rotation,
+            flip: self.flip,
+            adjustments: None,
+            convert: self.convert.clone(),
+            compress: self.compress.clone(),
+            metadata: self.metadata.clone(),
+            watermark: self.watermark.clone(),
+            rename: self.rename.clone(),
+            overwrite_behavior: crate::operations::OverwriteAction::default(),
+            preserve_directory_structure: false,
+            progressive_jpeg: false,
+            avif_speed: self.compress.as_ref().map(|c| match c {
+                crate::operations::CompressConfig::Preset(p) => p.avif_speed(),
+                _ => 6,
+            }).unwrap_or(6),
+            output_dpi: 0,
+        }
+    }
+
+    pub fn all_builtins() -> Vec<Preset> {
+        vec![
+            Self::builtin_blog_photos(),
+            Self::builtin_social_media(),
+            Self::builtin_web_optimization(),
+            Self::builtin_email_friendly(),
+            Self::builtin_privacy_clean(),
+            Self::builtin_photographer_export(),
+            Self::builtin_archive_compress(),
+            Self::builtin_fediverse_ready(),
+            Self::builtin_print_ready(),
+        ]
+    }
+
+    pub fn builtin_blog_photos() -> Preset {
+        Preset {
+            name: "Blog Photos".into(),
+            description: "Resize 1200px wide, JPEG quality High, strip all metadata".into(),
+            icon: "image-x-generic-symbolic".into(),
+            icon_color: "accent".into(),
+            is_custom: false,
+            resize: Some(ResizeConfig::ByWidth(1200)),
+            rotation: None,
+            flip: None,
+            convert: None,
+            compress: Some(CompressConfig::Preset(QualityPreset::High)),
+            metadata: Some(MetadataConfig::StripAll),
+            watermark: None,
+            rename: None,
+        }
+    }
+
+    pub fn builtin_social_media() -> Preset {
+        Preset {
+            name: "Social Media".into(),
+            description: "Resize to fit 1080x1080, compress Medium, strip metadata".into(),
+            icon: "system-users-symbolic".into(),
+            icon_color: "success".into(),
+            is_custom: false,
+            resize: Some(ResizeConfig::FitInBox {
+                max: Dimensions {
+                    width: 1080,
+                    height: 1080,
+                },
+                allow_upscale: false,
+            }),
+            rotation: None,
+            flip: None,
+            convert: None,
+            compress: Some(CompressConfig::Preset(QualityPreset::Medium)),
+            metadata: Some(MetadataConfig::StripAll),
+            watermark: None,
+            rename: None,
+        }
+    }
+
+    pub fn builtin_web_optimization() -> Preset {
+        Preset {
+            name: "Web Optimization".into(),
+            description: "Convert to WebP, compress High, sequential rename".into(),
+            icon: "web-browser-symbolic".into(),
+            icon_color: "accent".into(),
+            is_custom: false,
+            resize: None,
+            rotation: None,
+            flip: None,
+            convert: Some(ConvertConfig::SingleFormat(ImageFormat::WebP)),
+            compress: Some(CompressConfig::Preset(QualityPreset::High)),
+            metadata: Some(MetadataConfig::StripAll),
+            watermark: None,
+            rename: Some(RenameConfig {
+                prefix: String::new(),
+                suffix: String::new(),
+                counter_start: 1,
+                counter_padding: 3,
+                counter_enabled: true,
+                counter_position: 3,
+                template: None,
+                case_mode: 0,
+                replace_spaces: 0,
+                special_chars: 0,
+                regex_find: String::new(),
+                regex_replace: String::new(),
+            }),
+        }
+    }
+
+    pub fn builtin_email_friendly() -> Preset {
+        Preset {
+            name: "Email Friendly".into(),
+            description: "Resize 800px wide, JPEG quality Medium".into(),
+            icon: "mail-unread-symbolic".into(),
+            icon_color: "warning".into(),
+            is_custom: false,
+            resize: Some(ResizeConfig::ByWidth(800)),
+            rotation: None,
+            flip: None,
+            convert: None,
+            compress: Some(CompressConfig::Preset(QualityPreset::Medium)),
+            metadata: Some(MetadataConfig::StripAll),
+            watermark: None,
+            rename: None,
+        }
+    }
+
+    pub fn builtin_privacy_clean() -> Preset {
+        Preset {
+            name: "Privacy Clean".into(),
+            description: "Strip all metadata, no other changes".into(),
+            icon: "security-high-symbolic".into(),
+            icon_color: "error".into(),
+            is_custom: false,
+            resize: None,
+            rotation: None,
+            flip: None,
+            convert: None,
+            compress: None,
+            metadata: Some(MetadataConfig::StripAll),
+            watermark: None,
+            rename: None,
+        }
+    }
+
+    pub fn builtin_photographer_export() -> Preset {
+        Preset {
+            name: "Photographer Export".into(),
+            description: "Resize 2048px, compress High, privacy metadata, rename by date".into(),
+            icon: "camera-photo-symbolic".into(),
+            icon_color: "success".into(),
+            is_custom: false,
+            resize: Some(ResizeConfig::ByWidth(2048)),
+            rotation: None,
+            flip: None,
+            convert: None,
+            compress: Some(CompressConfig::Preset(QualityPreset::High)),
+            metadata: Some(MetadataConfig::Privacy),
+            watermark: None,
+            rename: Some(RenameConfig {
+                prefix: String::new(),
+                suffix: String::new(),
+                counter_start: 1,
+                counter_padding: 4,
+                counter_enabled: true,
+                counter_position: 3,
+                template: Some("{exif_date}_{name}_{counter:4}".into()),
+                case_mode: 0,
+                replace_spaces: 0,
+                special_chars: 0,
+                regex_find: String::new(),
+                regex_replace: String::new(),
+            }),
+        }
+    }
+
+    pub fn builtin_archive_compress() -> Preset {
+        Preset {
+            name: "Archive Compress".into(),
+            description: "Lossless compression, preserve metadata".into(),
+            icon: "folder-symbolic".into(),
+            icon_color: "warning".into(),
+            is_custom: false,
+            resize: None,
+            rotation: None,
+            flip: None,
+            convert: None,
+            compress: Some(CompressConfig::Preset(QualityPreset::Maximum)),
+            metadata: Some(MetadataConfig::KeepAll),
+            watermark: None,
+            rename: None,
+        }
+    }
+
+    pub fn builtin_print_ready() -> Preset {
+        Preset {
+            name: "Print Ready".into(),
+            description: "Maximum quality, convert to PNG, keep all metadata".into(),
+            icon: "printer-symbolic".into(),
+            icon_color: "success".into(),
+            is_custom: false,
+            resize: None,
+            rotation: None,
+            flip: None,
+            convert: Some(ConvertConfig::SingleFormat(ImageFormat::Png)),
+            compress: Some(CompressConfig::Preset(QualityPreset::Maximum)),
+            metadata: Some(MetadataConfig::KeepAll),
+            watermark: None,
+            rename: None,
+        }
+    }
+
+    pub fn builtin_fediverse_ready() -> Preset {
+        Preset {
+            name: "Fediverse Ready".into(),
+            description: "Resize 1920x1080, convert to WebP, compress High, strip metadata".into(),
+            icon: "network-server-symbolic".into(),
+            icon_color: "accent".into(),
+            is_custom: false,
+            resize: Some(ResizeConfig::FitInBox {
+                max: Dimensions {
+                    width: 1920,
+                    height: 1080,
+                },
+                allow_upscale: false,
+            }),
+            rotation: None,
+            flip: None,
+            convert: Some(ConvertConfig::SingleFormat(ImageFormat::WebP)),
+            compress: Some(CompressConfig::Preset(QualityPreset::High)),
+            metadata: Some(MetadataConfig::StripAll),
+            watermark: None,
+            rename: None,
+        }
+    }
+}

pixstrip-core/src/storage.rs

@@ -0,0 +1,342 @@
+use std::path::{Path, PathBuf};
+
+use serde::{Deserialize, Serialize};
+
+use crate::config::AppConfig;
+use crate::error::{PixstripError, Result};
+use crate::preset::Preset;
+
+fn default_config_dir() -> PathBuf {
+    dirs::config_dir()
+        .or_else(|| dirs::home_dir().map(|h| h.join(".config")))
+        .unwrap_or_else(std::env::temp_dir)
+        .join("pixstrip")
+}
+
+/// Write to a temporary file then rename, for crash safety.
+pub fn atomic_write(path: &Path, contents: &str) -> std::io::Result<()> {
+    let tmp = path.with_extension("tmp");
+    std::fs::write(&tmp, contents)?;
+    std::fs::rename(&tmp, path)?;
+    Ok(())
+}
+
+fn sanitize_filename(name: &str) -> String {
+    name.chars()
+        .map(|c| match c {
+            '/' | '\\' | '<' | '>' | ':' | '"' | '|' | '?' | '*' => '_',
+            _ => c,
+        })
+        .collect()
+}
+
+// --- Preset Store ---
+
+pub struct PresetStore {
+    presets_dir: PathBuf,
+}
+
+impl PresetStore {
+    pub fn new() -> Self {
+        Self {
+            presets_dir: default_config_dir().join("presets"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            presets_dir: base.join("presets"),
+        }
+    }
+
+    fn ensure_dir(&self) -> Result<()> {
+        std::fs::create_dir_all(&self.presets_dir).map_err(PixstripError::Io)
+    }
+
+    fn preset_path(&self, name: &str) -> PathBuf {
+        let filename = format!("{}.json", sanitize_filename(name));
+        self.presets_dir.join(filename)
+    }
+
+    pub fn save(&self, preset: &Preset) -> Result<()> {
+        self.ensure_dir()?;
+        let path = self.preset_path(&preset.name);
+        let json = serde_json::to_string_pretty(preset)
+            .map_err(|e| PixstripError::Preset(e.to_string()))?;
+        atomic_write(&path, &json).map_err(PixstripError::Io)
+    }
+
+    pub fn load(&self, name: &str) -> Result<Preset> {
+        let path = self.preset_path(name);
+        if !path.exists() {
+            return Err(PixstripError::Preset(format!(
+                "Preset '{}' not found",
+                name
+            )));
+        }
+        let data = std::fs::read_to_string(&path).map_err(PixstripError::Io)?;
+        serde_json::from_str(&data).map_err(|e| PixstripError::Preset(e.to_string()))
+    }
+
+    pub fn list(&self) -> Result<Vec<Preset>> {
+        if !self.presets_dir.exists() {
+            return Ok(Vec::new());
+        }
+
+        let mut presets = Vec::new();
+        for entry in std::fs::read_dir(&self.presets_dir).map_err(PixstripError::Io)? {
+            let entry = entry.map_err(PixstripError::Io)?;
+            let path = entry.path();
+            if path.extension().and_then(|e| e.to_str()) == Some("json") {
+                let data = std::fs::read_to_string(&path).map_err(PixstripError::Io)?;
+                if let Ok(preset) = serde_json::from_str::<Preset>(&data) {
+                    presets.push(preset);
+                }
+            }
+        }
+        presets.sort_by(|a, b| a.name.cmp(&b.name));
+        Ok(presets)
+    }
+
+    pub fn delete(&self, name: &str) -> Result<()> {
+        let path = self.preset_path(name);
+        if !path.exists() {
+            return Err(PixstripError::Preset(format!(
+                "Preset '{}' not found",
+                name
+            )));
+        }
+        std::fs::remove_file(&path).map_err(PixstripError::Io)
+    }
+
+    pub fn export_to_file(&self, preset: &Preset, path: &Path) -> Result<()> {
+        let json = serde_json::to_string_pretty(preset)
+            .map_err(|e| PixstripError::Preset(e.to_string()))?;
+        atomic_write(path, &json).map_err(PixstripError::Io)
+    }
+
+    pub fn import_from_file(&self, path: &Path) -> Result<Preset> {
+        let data = std::fs::read_to_string(path).map_err(PixstripError::Io)?;
+        let mut preset: Preset =
+            serde_json::from_str(&data).map_err(|e| PixstripError::Preset(e.to_string()))?;
+        preset.is_custom = true;
+        Ok(preset)
+    }
+}
+
+impl Default for PresetStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+// --- Config Store ---
+
+pub struct ConfigStore {
+    config_path: PathBuf,
+}
+
+impl ConfigStore {
+    pub fn new() -> Self {
+        Self {
+            config_path: default_config_dir().join("config.json"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            config_path: base.join("config.json"),
+        }
+    }
+
+    pub fn save(&self, config: &AppConfig) -> Result<()> {
+        if let Some(parent) = self.config_path.parent() {
+            std::fs::create_dir_all(parent).map_err(PixstripError::Io)?;
+        }
+        let json = serde_json::to_string_pretty(config)
+            .map_err(|e| PixstripError::Config(e.to_string()))?;
+        atomic_write(&self.config_path, &json).map_err(PixstripError::Io)
+    }
+
+    pub fn load(&self) -> Result<AppConfig> {
+        if !self.config_path.exists() {
+            return Ok(AppConfig::default());
+        }
+        let data = std::fs::read_to_string(&self.config_path).map_err(PixstripError::Io)?;
+        serde_json::from_str(&data).map_err(|e| PixstripError::Config(e.to_string()))
+    }
+}
+
+impl Default for ConfigStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+// --- Session Store ---
+
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[serde(default)]
+pub struct SessionState {
+    pub last_input_dir: Option<String>,
+    pub last_output_dir: Option<String>,
+    pub last_preset_name: Option<String>,
+    pub current_step: u32,
+    pub window_width: Option<i32>,
+    pub window_height: Option<i32>,
+    pub window_maximized: bool,
+    // Last-used wizard settings
+    pub resize_enabled: Option<bool>,
+    pub resize_width: Option<u32>,
+    pub resize_height: Option<u32>,
+    pub adjustments_enabled: Option<bool>,
+    pub convert_enabled: Option<bool>,
+    pub convert_format: Option<String>,
+    pub compress_enabled: Option<bool>,
+    pub quality_preset: Option<String>,
+    pub metadata_enabled: Option<bool>,
+    pub metadata_mode: Option<String>,
+    pub watermark_enabled: Option<bool>,
+    pub rename_enabled: Option<bool>,
+    pub last_seen_version: Option<String>,
+    pub expanded_sections: std::collections::HashMap<String, bool>,
+}
+
+pub struct SessionStore {
+    session_path: PathBuf,
+}
+
+impl SessionStore {
+    pub fn new() -> Self {
+        Self {
+            session_path: default_config_dir().join("session.json"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            session_path: base.join("session.json"),
+        }
+    }
+
+    pub fn save(&self, state: &SessionState) -> Result<()> {
+        if let Some(parent) = self.session_path.parent() {
+            std::fs::create_dir_all(parent).map_err(PixstripError::Io)?;
+        }
+        let json = serde_json::to_string_pretty(state)
+            .map_err(|e| PixstripError::Config(e.to_string()))?;
+        atomic_write(&self.session_path, &json).map_err(PixstripError::Io)
+    }
+
+    pub fn load(&self) -> Result<SessionState> {
+        if !self.session_path.exists() {
+            return Ok(SessionState::default());
+        }
+        let data = std::fs::read_to_string(&self.session_path).map_err(PixstripError::Io)?;
+        serde_json::from_str(&data).map_err(|e| PixstripError::Config(e.to_string()))
+    }
+}
+
+impl Default for SessionStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+// --- History Store ---
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct HistoryEntry {
+    pub timestamp: String,
+    pub input_dir: String,
+    pub output_dir: String,
+    pub preset_name: Option<String>,
+    pub total: usize,
+    pub succeeded: usize,
+    pub failed: usize,
+    pub total_input_bytes: u64,
+    pub total_output_bytes: u64,
+    pub elapsed_ms: u64,
+    pub output_files: Vec<String>,
+}
+
+pub struct HistoryStore {
+    history_path: PathBuf,
+}
+
+impl HistoryStore {
+    pub fn new() -> Self {
+        Self {
+            history_path: default_config_dir().join("history.json"),
+        }
+    }
+
+    pub fn with_base_dir(base: &Path) -> Self {
+        Self {
+            history_path: base.join("history.json"),
+        }
+    }
+
+    pub fn add(&self, entry: HistoryEntry, max_entries: usize, max_days: u32) -> Result<()> {
+        let mut entries = self.list()?;
+        entries.push(entry);
+        self.write_all(&entries)?;
+        self.prune(max_entries, max_days)
+    }
+
+    pub fn prune(&self, max_entries: usize, max_days: u32) -> Result<()> {
+        let mut entries = self.list()?;
+        if entries.is_empty() {
+            return Ok(());
+        }
+
+        let now_secs = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .unwrap_or_default()
+            .as_secs();
+        let cutoff_secs = now_secs.saturating_sub(max_days as u64 * 86400);
+
+        // Remove entries older than max_days (keep entries with unparseable timestamps)
+        entries.retain(|e| {
+            e.timestamp.parse::<u64>().map_or(true, |ts| ts >= cutoff_secs)
+        });
+
+        // Trim to max_entries (keep the most recent)
+        if entries.len() > max_entries {
+            let start = entries.len() - max_entries;
+            entries = entries.split_off(start);
+        }
+
+        self.write_all(&entries)
+    }
+
+    pub fn list(&self) -> Result<Vec<HistoryEntry>> {
+        if !self.history_path.exists() {
+            return Ok(Vec::new());
+        }
+        let data = std::fs::read_to_string(&self.history_path).map_err(PixstripError::Io)?;
+        if data.trim().is_empty() {
+            return Ok(Vec::new());
+        }
+        serde_json::from_str(&data).map_err(|e| PixstripError::Config(e.to_string()))
+    }
+
+    pub fn clear(&self) -> Result<()> {
+        self.write_all(&Vec::<HistoryEntry>::new())
+    }
+
+    pub fn write_all(&self, entries: &[HistoryEntry]) -> Result<()> {
+        if let Some(parent) = self.history_path.parent() {
+            std::fs::create_dir_all(parent).map_err(PixstripError::Io)?;
+        }
+        let json = serde_json::to_string_pretty(entries)
+            .map_err(|e| PixstripError::Config(e.to_string()))?;
+        atomic_write(&self.history_path, &json).map_err(PixstripError::Io)
+    }
+}
+
+impl Default for HistoryStore {
+    fn default() -> Self {
+        Self::new()
+    }
+}

pixstrip-core/src/types.rs

@@ -11,6 +11,7 @@ pub enum ImageFormat {
     Avif,
     Gif,
     Tiff,
+    Bmp,
 }
 
 impl ImageFormat {
@@ -22,6 +23,7 @@ impl ImageFormat {
             "avif" => Some(Self::Avif),
             "gif" => Some(Self::Gif),
             "tiff" | "tif" => Some(Self::Tiff),
+            "bmp" => Some(Self::Bmp),
             _ => None,
         }
     }
@@ -34,6 +36,7 @@ impl ImageFormat {
             Self::Avif => "avif",
             Self::Gif => "gif",
             Self::Tiff => "tiff",
+            Self::Bmp => "bmp",
         }
     }
 }
@@ -66,10 +69,17 @@ pub struct Dimensions {
 
 impl Dimensions {
     pub fn aspect_ratio(&self) -> f64 {
+        if self.height == 0 {
+            return 1.0;
+        }
         self.width as f64 / self.height as f64
     }
 
     pub fn fit_within(self, max: Dimensions, allow_upscale: bool) -> Dimensions {
+        if self.width == 0 || self.height == 0 || max.width == 0 || max.height == 0 {
+            return self;
+        }
+
         if !allow_upscale && self.width <= max.width && self.height <= max.height {
             return self;
         }
@@ -83,8 +93,8 @@ impl Dimensions {
         }
 
         Dimensions {
-            width: (self.width as f64 * scale).round() as u32,
+            width: (self.width as f64 * scale).round().max(1.0) as u32,
-            height: (self.height as f64 * scale).round() as u32,
+            height: (self.height as f64 * scale).round().max(1.0) as u32,
         }
     }
 }
@@ -135,6 +145,36 @@ impl QualityPreset {
         }
     }
 
+    pub fn webp_effort(&self) -> u8 {
+        match self {
+            Self::Maximum => 6,
+            Self::High => 5,
+            Self::Medium => 4,
+            Self::Low => 3,
+            Self::WebOptimized => 4,
+        }
+    }
+
+    pub fn avif_quality(&self) -> u8 {
+        match self {
+            Self::Maximum => 80,
+            Self::High => 63,
+            Self::Medium => 50,
+            Self::Low => 35,
+            Self::WebOptimized => 40,
+        }
+    }
+
+    pub fn avif_speed(&self) -> u8 {
+        match self {
+            Self::Maximum => 4,
+            Self::High => 6,
+            Self::Medium => 6,
+            Self::Low => 8,
+            Self::WebOptimized => 8,
+        }
+    }
+
     pub fn label(&self) -> &'static str {
         match self {
             Self::Maximum => "Maximum",

pixstrip-core/src/watcher.rs

@@ -0,0 +1,118 @@
+use std::path::{Path, PathBuf};
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::mpsc;
+use std::sync::Arc;
+use std::time::Duration;
+
+use notify::{Event, EventKind, RecursiveMode, Watcher};
+use serde::{Deserialize, Serialize};
+
+use crate::error::{PixstripError, Result};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct WatchFolder {
+    pub path: PathBuf,
+    pub preset_name: String,
+    pub recursive: bool,
+    pub active: bool,
+}
+
+pub enum WatchEvent {
+    NewImage(PathBuf),
+    Error(String),
+}
+
+pub struct FolderWatcher {
+    running: Arc<AtomicBool>,
+}
+
+impl FolderWatcher {
+    pub fn new() -> Self {
+        Self {
+            running: Arc::new(AtomicBool::new(false)),
+        }
+    }
+
+    pub fn start(
+        &self,
+        folder: &WatchFolder,
+        event_tx: mpsc::Sender<WatchEvent>,
+    ) -> Result<()> {
+        if !folder.path.exists() {
+            return Err(PixstripError::Config(format!(
+                "Watch folder does not exist: {}",
+                folder.path.display()
+            )));
+        }
+
+        self.running.store(true, Ordering::Relaxed);
+        let running = self.running.clone();
+        let watch_path = folder.path.clone();
+        let recursive = folder.recursive;
+
+        std::thread::spawn(move || {
+            let (tx, rx) = mpsc::channel();
+
+            let mut watcher = match notify::recommended_watcher(move |res: std::result::Result<Event, notify::Error>| {
+                if let Ok(event) = res {
+                    let _ = tx.send(event);
+                }
+            }) {
+                Ok(w) => w,
+                Err(e) => {
+                    let _ = event_tx.send(WatchEvent::Error(e.to_string()));
+                    return;
+                }
+            };
+
+            let mode = if recursive {
+                RecursiveMode::Recursive
+            } else {
+                RecursiveMode::NonRecursive
+            };
+
+            if let Err(e) = watcher.watch(&watch_path, mode) {
+                let _ = event_tx.send(WatchEvent::Error(e.to_string()));
+                return;
+            }
+
+            while running.load(Ordering::Relaxed) {
+                match rx.recv_timeout(Duration::from_millis(500)) {
+                    Ok(event) => {
+                        if matches!(event.kind, EventKind::Create(_)) {
+                            for path in event.paths {
+                                if is_image_file(&path) {
+                                    let _ = event_tx.send(WatchEvent::NewImage(path));
+                                }
+                            }
+                        }
+                    }
+                    Err(mpsc::RecvTimeoutError::Timeout) => continue,
+                    Err(mpsc::RecvTimeoutError::Disconnected) => break,
+                }
+            }
+        });
+
+        Ok(())
+    }
+
+    pub fn stop(&self) {
+        self.running.store(false, Ordering::Relaxed);
+    }
+
+    pub fn is_running(&self) -> bool {
+        self.running.load(Ordering::Relaxed)
+    }
+}
+
+impl Default for FolderWatcher {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+fn is_image_file(path: &Path) -> bool {
+    path.extension()
+        .and_then(|e| e.to_str())
+        .is_some_and(crate::discovery::is_image_extension)
+}

pixstrip-core/tests/adjustments_tests.rs

@@ -0,0 +1,145 @@
+use pixstrip_core::operations::AdjustmentsConfig;
+use pixstrip_core::operations::adjustments::apply_adjustments;
+use image::DynamicImage;
+
+fn noop_config() -> AdjustmentsConfig {
+    AdjustmentsConfig {
+        brightness: 0,
+        contrast: 0,
+        saturation: 0,
+        sharpen: false,
+        grayscale: false,
+        sepia: false,
+        crop_aspect_ratio: None,
+        trim_whitespace: false,
+        canvas_padding: 0,
+    }
+}
+
+#[test]
+fn is_noop_default() {
+    assert!(noop_config().is_noop());
+}
+
+#[test]
+fn is_noop_with_brightness() {
+    let mut config = noop_config();
+    config.brightness = 10;
+    assert!(!config.is_noop());
+}
+
+#[test]
+fn is_noop_with_sharpen() {
+    let mut config = noop_config();
+    config.sharpen = true;
+    assert!(!config.is_noop());
+}
+
+#[test]
+fn is_noop_with_crop() {
+    let mut config = noop_config();
+    config.crop_aspect_ratio = Some((16.0, 9.0));
+    assert!(!config.is_noop());
+}
+
+#[test]
+fn is_noop_with_trim() {
+    let mut config = noop_config();
+    config.trim_whitespace = true;
+    assert!(!config.is_noop());
+}
+
+#[test]
+fn is_noop_with_padding() {
+    let mut config = noop_config();
+    config.canvas_padding = 20;
+    assert!(!config.is_noop());
+}
+
+#[test]
+fn is_noop_with_grayscale() {
+    let mut config = noop_config();
+    config.grayscale = true;
+    assert!(!config.is_noop());
+}
+
+#[test]
+fn is_noop_with_sepia() {
+    let mut config = noop_config();
+    config.sepia = true;
+    assert!(!config.is_noop());
+}
+
+// --- crop_to_aspect_ratio edge cases ---
+
+fn make_test_image(w: u32, h: u32) -> DynamicImage {
+    DynamicImage::ImageRgba8(image::RgbaImage::from_pixel(w, h, image::Rgba([128, 128, 128, 255])))
+}
+
+#[test]
+fn crop_zero_ratio_returns_original() {
+    let img = make_test_image(100, 100);
+    let config = AdjustmentsConfig {
+        crop_aspect_ratio: Some((0.0, 9.0)),
+        ..noop_config()
+    };
+    let result = apply_adjustments(img, &config).unwrap();
+    assert_eq!(result.width(), 100);
+    assert_eq!(result.height(), 100);
+}
+
+#[test]
+fn crop_zero_height_ratio_returns_original() {
+    let img = make_test_image(100, 100);
+    let config = AdjustmentsConfig {
+        crop_aspect_ratio: Some((16.0, 0.0)),
+        ..noop_config()
+    };
+    let result = apply_adjustments(img, &config).unwrap();
+    assert_eq!(result.width(), 100);
+    assert_eq!(result.height(), 100);
+}
+
+#[test]
+fn crop_square_on_landscape() {
+    let img = make_test_image(200, 100);
+    let config = AdjustmentsConfig {
+        crop_aspect_ratio: Some((1.0, 1.0)),
+        ..noop_config()
+    };
+    let result = apply_adjustments(img, &config).unwrap();
+    assert_eq!(result.width(), 100);
+    assert_eq!(result.height(), 100);
+}
+
+#[test]
+fn crop_16_9_on_square() {
+    let img = make_test_image(100, 100);
+    let config = AdjustmentsConfig {
+        crop_aspect_ratio: Some((16.0, 9.0)),
+        ..noop_config()
+    };
+    let result = apply_adjustments(img, &config).unwrap();
+    assert_eq!(result.width(), 100);
+    assert_eq!(result.height(), 56);
+}
+
+#[test]
+fn canvas_padding_large_value() {
+    let img = make_test_image(10, 10);
+    let config = AdjustmentsConfig {
+        canvas_padding: 500,
+        ..noop_config()
+    };
+    let result = apply_adjustments(img, &config).unwrap();
+    assert_eq!(result.width(), 1010);
+    assert_eq!(result.height(), 1010);
+}
+
+#[test]
+fn noop_config_returns_same_dimensions() {
+    let img = make_test_image(200, 100);
+    let result = apply_adjustments(img, &noop_config()).unwrap();
+    assert_eq!(result.width(), 200);
+    assert_eq!(result.height(), 100);
+}

pixstrip-core/tests/config_tests.rs

@@ -0,0 +1,27 @@
+use pixstrip_core::config::*;
+
+#[test]
+fn default_config() {
+    let config = AppConfig::default();
+    assert_eq!(config.output_subfolder, "processed");
+    assert_eq!(config.overwrite_behavior, OverwriteBehavior::Ask);
+    assert!(config.remember_settings);
+    assert_eq!(config.skill_level, SkillLevel::Simple);
+    assert_eq!(config.thread_count, ThreadCount::Auto);
+    assert_eq!(config.error_behavior, ErrorBehavior::SkipAndContinue);
+}
+
+#[test]
+fn config_serialization_roundtrip() {
+    let config = AppConfig::default();
+    let json = serde_json::to_string(&config).unwrap();
+    let deserialized: AppConfig = serde_json::from_str(&json).unwrap();
+    assert_eq!(deserialized.output_subfolder, config.output_subfolder);
+    assert_eq!(deserialized.overwrite_behavior, config.overwrite_behavior);
+}
+
+#[test]
+fn skill_level_toggle() {
+    assert!(!SkillLevel::Simple.is_advanced());
+    assert!(SkillLevel::Detailed.is_advanced());
+}

pixstrip-core/tests/discovery_tests.rs

@@ -0,0 +1,52 @@
+use pixstrip_core::discovery::discover_images;
+use std::fs;
+
+fn create_test_tree(root: &std::path::Path) {
+    fs::create_dir_all(root.join("subdir")).unwrap();
+    fs::write(root.join("photo1.jpg"), b"fake jpeg").unwrap();
+    fs::write(root.join("photo2.png"), b"fake png").unwrap();
+    fs::write(root.join("readme.txt"), b"not an image").unwrap();
+    fs::write(root.join("subdir/nested.webp"), b"fake webp").unwrap();
+    fs::write(root.join("subdir/doc.pdf"), b"not an image").unwrap();
+}
+
+#[test]
+fn discover_flat() {
+    let dir = tempfile::tempdir().unwrap();
+    create_test_tree(dir.path());
+
+    let images = discover_images(dir.path(), false);
+    assert_eq!(images.len(), 2);
+    let names: Vec<String> = images
+        .iter()
+        .map(|p| p.file_name().unwrap().to_string_lossy().into_owned())
+        .collect();
+    assert!(names.contains(&"photo1.jpg".to_string()));
+    assert!(names.contains(&"photo2.png".to_string()));
+}
+
+#[test]
+fn discover_recursive() {
+    let dir = tempfile::tempdir().unwrap();
+    create_test_tree(dir.path());
+
+    let images = discover_images(dir.path(), true);
+    assert_eq!(images.len(), 3);
+}
+
+#[test]
+fn discover_empty_dir() {
+    let dir = tempfile::tempdir().unwrap();
+    let images = discover_images(dir.path(), true);
+    assert!(images.is_empty());
+}
+
+#[test]
+fn discover_single_file() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("single.jpg");
+    fs::write(&path, b"fake jpeg").unwrap();
+
+    let images = discover_images(&path, false);
+    assert_eq!(images.len(), 1);
+}

pixstrip-core/tests/encoder_tests.rs

@@ -0,0 +1,88 @@
+use pixstrip_core::encoder::OutputEncoder;
+use pixstrip_core::types::{ImageFormat, QualityPreset};
+
+fn create_test_rgb_image(width: u32, height: u32) -> image::DynamicImage {
+    let img = image::RgbImage::from_fn(width, height, |x, y| {
+        image::Rgb([(x % 256) as u8, (y % 256) as u8, 128])
+    });
+    image::DynamicImage::ImageRgb8(img)
+}
+
+fn create_test_rgba_image(width: u32, height: u32) -> image::DynamicImage {
+    let img = image::RgbaImage::from_fn(width, height, |x, y| {
+        image::Rgba([(x % 256) as u8, (y % 256) as u8, 100, 255])
+    });
+    image::DynamicImage::ImageRgba8(img)
+}
+
+#[test]
+fn encode_jpeg() {
+    let img = create_test_rgb_image(200, 150);
+    let encoder = OutputEncoder::new();
+    let bytes = encoder.encode(&img, ImageFormat::Jpeg, Some(85)).unwrap();
+    assert!(!bytes.is_empty());
+    // JPEG magic bytes
+    assert_eq!(bytes[0], 0xFF);
+    assert_eq!(bytes[1], 0xD8);
+}
+
+#[test]
+fn encode_jpeg_quality_affects_size() {
+    let img = create_test_rgb_image(200, 150);
+    let encoder = OutputEncoder::new();
+    let high = encoder.encode(&img, ImageFormat::Jpeg, Some(95)).unwrap();
+    let low = encoder.encode(&img, ImageFormat::Jpeg, Some(50)).unwrap();
+    assert!(high.len() > low.len(), "Higher quality should produce larger files");
+}
+
+#[test]
+fn encode_png() {
+    let img = create_test_rgba_image(200, 150);
+    let encoder = OutputEncoder::new();
+    let bytes = encoder.encode(&img, ImageFormat::Png, None).unwrap();
+    assert!(!bytes.is_empty());
+    // PNG magic bytes
+    assert_eq!(&bytes[0..4], &[0x89, 0x50, 0x4E, 0x47]);
+}
+
+#[test]
+fn encode_webp() {
+    let img = create_test_rgb_image(200, 150);
+    let encoder = OutputEncoder::new();
+    let bytes = encoder.encode(&img, ImageFormat::WebP, Some(80)).unwrap();
+    assert!(!bytes.is_empty());
+    // RIFF header
+    assert_eq!(&bytes[0..4], b"RIFF");
+}
+
+#[test]
+fn encode_to_file() {
+    let img = create_test_rgb_image(200, 150);
+    let encoder = OutputEncoder::new();
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("output.jpg");
+    encoder.encode_to_file(&img, &path, ImageFormat::Jpeg, Some(85)).unwrap();
+    assert!(path.exists());
+    let metadata = std::fs::metadata(&path).unwrap();
+    assert!(metadata.len() > 0);
+}
+
+#[test]
+fn quality_from_preset() {
+    let encoder = OutputEncoder::new();
+    let preset = QualityPreset::High;
+    let q = encoder.quality_for_format(ImageFormat::Jpeg, &preset);
+    assert_eq!(q, 85);
+    let q = encoder.quality_for_format(ImageFormat::WebP, &preset);
+    assert!((q as f32 - 85.0).abs() < 1.0);
+}
+
+#[test]
+fn encode_gif_fallback() {
+    let img = create_test_rgba_image(50, 50);
+    let encoder = OutputEncoder::new();
+    let bytes = encoder.encode(&img, ImageFormat::Gif, None).unwrap();
+    assert!(!bytes.is_empty());
+    // GIF magic bytes
+    assert_eq!(&bytes[0..3], b"GIF");
+}

pixstrip-core/tests/executor_tests.rs

@@ -0,0 +1,139 @@
+use pixstrip_core::executor::PipelineExecutor;
+use pixstrip_core::operations::*;
+use pixstrip_core::pipeline::ProcessingJob;
+use pixstrip_core::types::*;
+use std::sync::atomic::AtomicBool;
+use std::sync::{Arc, Mutex};
+
+fn create_test_jpeg(path: &std::path::Path) {
+    let img = image::RgbImage::from_fn(200, 150, |x, y| {
+        image::Rgb([(x % 256) as u8, (y % 256) as u8, 128])
+    });
+    img.save_with_format(path, image::ImageFormat::Jpeg).unwrap();
+}
+
+fn setup_test_dir() -> (tempfile::TempDir, std::path::PathBuf, std::path::PathBuf) {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("input");
+    let output = dir.path().join("output");
+    std::fs::create_dir_all(&input).unwrap();
+    std::fs::create_dir_all(&output).unwrap();
+    (dir, input, output)
+}
+
+#[test]
+fn execute_single_image_resize() {
+    let (_dir, input, output) = setup_test_dir();
+    create_test_jpeg(&input.join("photo.jpg"));
+
+    let mut job = ProcessingJob::new(&input, &output);
+    job.add_source(input.join("photo.jpg"));
+    job.resize = Some(ResizeConfig::ByWidth(100));
+
+    let executor = PipelineExecutor::new();
+    let result = executor.execute(&job, |_| {}).unwrap();
+
+    assert_eq!(result.succeeded, 1);
+    assert_eq!(result.failed, 0);
+    assert!(output.join("photo.jpg").exists());
+}
+
+#[test]
+fn execute_resize_and_convert() {
+    let (_dir, input, output) = setup_test_dir();
+    create_test_jpeg(&input.join("photo.jpg"));
+
+    let mut job = ProcessingJob::new(&input, &output);
+    job.add_source(input.join("photo.jpg"));
+    job.resize = Some(ResizeConfig::ByWidth(100));
+    job.convert = Some(ConvertConfig::SingleFormat(ImageFormat::WebP));
+
+    let executor = PipelineExecutor::new();
+    let result = executor.execute(&job, |_| {}).unwrap();
+
+    assert_eq!(result.succeeded, 1);
+    assert!(output.join("photo.webp").exists());
+}
+
+#[test]
+fn execute_multiple_images() {
+    let (_dir, input, output) = setup_test_dir();
+    create_test_jpeg(&input.join("a.jpg"));
+    create_test_jpeg(&input.join("b.jpg"));
+    create_test_jpeg(&input.join("c.jpg"));
+
+    let mut job = ProcessingJob::new(&input, &output);
+    job.add_source(input.join("a.jpg"));
+    job.add_source(input.join("b.jpg"));
+    job.add_source(input.join("c.jpg"));
+    job.resize = Some(ResizeConfig::ByWidth(50));
+
+    let executor = PipelineExecutor::new();
+    let result = executor.execute(&job, |_| {}).unwrap();
+
+    assert_eq!(result.succeeded, 3);
+    assert_eq!(result.failed, 0);
+    assert_eq!(result.total, 3);
+}
+
+#[test]
+fn execute_collects_progress() {
+    let (_dir, input, output) = setup_test_dir();
+    create_test_jpeg(&input.join("photo.jpg"));
+
+    let mut job = ProcessingJob::new(&input, &output);
+    job.add_source(input.join("photo.jpg"));
+    job.resize = Some(ResizeConfig::ByWidth(100));
+
+    let updates = Arc::new(Mutex::new(Vec::new()));
+    let updates_clone = updates.clone();
+
+    let executor = PipelineExecutor::new();
+    executor.execute(&job, move |update| {
+        updates_clone.lock().unwrap().push(update);
+    }).unwrap();
+
+    let updates = updates.lock().unwrap();
+    assert!(!updates.is_empty());
+}
+
+#[test]
+fn execute_with_cancellation() {
+    let (_dir, input, output) = setup_test_dir();
+    create_test_jpeg(&input.join("a.jpg"));
+    create_test_jpeg(&input.join("b.jpg"));
+
+    let mut job = ProcessingJob::new(&input, &output);
+    job.add_source(input.join("a.jpg"));
+    job.add_source(input.join("b.jpg"));
+    job.resize = Some(ResizeConfig::ByWidth(100));
+
+    let cancel = Arc::new(AtomicBool::new(true)); // cancel immediately
+    let executor = PipelineExecutor::with_cancel(cancel);
+    let result = executor.execute(&job, |_| {}).unwrap();
+
+    // Cancellation flag should be set
+    assert!(result.cancelled, "result.cancelled should be true when cancel flag is set");
+    // Total processed should be less than total sources (at least some skipped)
+    assert!(
+        result.succeeded + result.failed <= 2,
+        "processed count ({}) should not exceed total (2)",
+        result.succeeded + result.failed
+    );
+}
+
+#[test]
+fn batch_result_tracks_sizes() {
+    let (_dir, input, output) = setup_test_dir();
+    create_test_jpeg(&input.join("photo.jpg"));
+
+    let mut job = ProcessingJob::new(&input, &output);
+    job.add_source(input.join("photo.jpg"));
+    job.compress = Some(CompressConfig::Preset(QualityPreset::Low));
+
+    let executor = PipelineExecutor::new();
+    let result = executor.execute(&job, |_| {}).unwrap();
+
+    assert!(result.total_input_bytes > 0);
+    assert!(result.total_output_bytes > 0);
+}

pixstrip-core/tests/integration_tests.rs

@@ -0,0 +1,85 @@
+use pixstrip_core::encoder::OutputEncoder;
+use pixstrip_core::loader::ImageLoader;
+use pixstrip_core::operations::resize::resize_image;
+use pixstrip_core::operations::ResizeConfig;
+use pixstrip_core::types::ImageFormat;
+use std::path::Path;
+
+fn create_test_jpeg(path: &Path) {
+    let img = image::RgbImage::from_fn(400, 300, |x, y| {
+        image::Rgb([(x % 256) as u8, (y % 256) as u8, 128])
+    });
+    img.save_with_format(path, image::ImageFormat::Jpeg).unwrap();
+}
+
+fn create_test_png(path: &Path) {
+    let img = image::RgbaImage::from_fn(400, 300, |x, y| {
+        image::Rgba([(x % 256) as u8, (y % 256) as u8, 100, 255])
+    });
+    img.save_with_format(path, image::ImageFormat::Png).unwrap();
+}
+
+#[test]
+fn load_resize_save_as_webp() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("input.jpg");
+    let output = dir.path().join("output.webp");
+    create_test_jpeg(&input);
+
+    let loader = ImageLoader::new();
+    let img = loader.load_pixels(&input).unwrap();
+
+    let config = ResizeConfig::ByWidth(200);
+    let resized = resize_image(&img, &config).unwrap();
+    assert_eq!(resized.width(), 200);
+    assert_eq!(resized.height(), 150);
+
+    let encoder = OutputEncoder::new();
+    encoder.encode_to_file(&resized, &output, ImageFormat::WebP, Some(80)).unwrap();
+    assert!(output.exists());
+
+    let info = loader.load_info(&output).unwrap();
+    assert_eq!(info.dimensions.width, 200);
+    assert_eq!(info.dimensions.height, 150);
+}
+
+#[test]
+fn load_png_compress_smaller() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("input.png");
+    let output = dir.path().join("output.png");
+    create_test_png(&input);
+
+    let loader = ImageLoader::new();
+    let img = loader.load_pixels(&input).unwrap();
+
+    let encoder = OutputEncoder::new();
+    encoder.encode_to_file(&img, &output, ImageFormat::Png, None).unwrap();
+
+    let original_size = std::fs::metadata(&input).unwrap().len();
+    let optimized_size = std::fs::metadata(&output).unwrap().len();
+    assert!(
+        optimized_size <= original_size,
+        "Optimized PNG ({}) should be <= original ({})",
+        optimized_size,
+        original_size
+    );
+}
+
+#[test]
+fn load_jpeg_convert_to_png() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("input.jpg");
+    let output = dir.path().join("output.png");
+    create_test_jpeg(&input);
+
+    let loader = ImageLoader::new();
+    let img = loader.load_pixels(&input).unwrap();
+
+    let encoder = OutputEncoder::new();
+    encoder.encode_to_file(&img, &output, ImageFormat::Png, None).unwrap();
+    assert!(output.exists());
+
+    let info = loader.load_info(&output).unwrap();
+    assert_eq!(info.format, Some(ImageFormat::Png));
+}

pixstrip-core/tests/loader_tests.rs

@@ -0,0 +1,73 @@
+use pixstrip_core::loader::ImageLoader;
+use pixstrip_core::types::Dimensions;
+use std::path::Path;
+
+fn create_test_jpeg(path: &Path) {
+    use image::{RgbImage, ImageFormat};
+    let img = RgbImage::from_fn(100, 80, |x, y| {
+        image::Rgb([(x % 256) as u8, (y % 256) as u8, 128])
+    });
+    img.save_with_format(path, ImageFormat::Jpeg).unwrap();
+}
+
+fn create_test_png(path: &Path) {
+    use image::{RgbaImage, ImageFormat};
+    let img = RgbaImage::from_fn(200, 150, |x, y| {
+        image::Rgba([(x % 256) as u8, (y % 256) as u8, 100, 255])
+    });
+    img.save_with_format(path, ImageFormat::Png).unwrap();
+}
+
+#[test]
+fn load_jpeg_dimensions() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("test.jpg");
+    create_test_jpeg(&path);
+
+    let loader = ImageLoader::new();
+    let info = loader.load_info(&path).unwrap();
+    assert_eq!(info.dimensions, Dimensions { width: 100, height: 80 });
+    assert_eq!(info.format, Some(pixstrip_core::types::ImageFormat::Jpeg));
+}
+
+#[test]
+fn load_png_dimensions() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("test.png");
+    create_test_png(&path);
+
+    let loader = ImageLoader::new();
+    let info = loader.load_info(&path).unwrap();
+    assert_eq!(info.dimensions, Dimensions { width: 200, height: 150 });
+    assert_eq!(info.format, Some(pixstrip_core::types::ImageFormat::Png));
+}
+
+#[test]
+fn load_pixels() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("test.jpg");
+    create_test_jpeg(&path);
+
+    let loader = ImageLoader::new();
+    let pixels = loader.load_pixels(&path).unwrap();
+    assert_eq!(pixels.width(), 100);
+    assert_eq!(pixels.height(), 80);
+}
+
+#[test]
+fn load_nonexistent_file() {
+    let loader = ImageLoader::new();
+    let result = loader.load_info(Path::new("/tmp/does_not_exist_pixstrip.jpg"));
+    assert!(result.is_err());
+}
+
+#[test]
+fn file_size_bytes() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("test.jpg");
+    create_test_jpeg(&path);
+
+    let loader = ImageLoader::new();
+    let info = loader.load_info(&path).unwrap();
+    assert!(info.file_size > 0);
+}

pixstrip-core/tests/metadata_tests.rs

@@ -0,0 +1,125 @@
+use pixstrip_core::operations::MetadataConfig;
+use pixstrip_core::operations::metadata::strip_metadata;
+use std::path::Path;
+
+fn create_test_jpeg(path: &Path) {
+    let img = image::RgbImage::from_fn(100, 80, |x, y| {
+        image::Rgb([(x % 256) as u8, (y % 256) as u8, 128])
+    });
+    img.save_with_format(path, image::ImageFormat::Jpeg).unwrap();
+}
+
+#[test]
+fn strip_all_metadata_produces_file() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("test.jpg");
+    let output = dir.path().join("stripped.jpg");
+    create_test_jpeg(&input);
+
+    strip_metadata(&input, &output, &MetadataConfig::StripAll).unwrap();
+    assert!(output.exists());
+    assert!(std::fs::metadata(&output).unwrap().len() > 0);
+}
+
+#[test]
+fn keep_all_metadata_copies_file() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("test.jpg");
+    let output = dir.path().join("kept.jpg");
+    create_test_jpeg(&input);
+
+    strip_metadata(&input, &output, &MetadataConfig::KeepAll).unwrap();
+    assert!(output.exists());
+}
+
+#[test]
+fn privacy_mode_strips_gps() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("test.jpg");
+    let output = dir.path().join("privacy.jpg");
+    create_test_jpeg(&input);
+
+    strip_metadata(&input, &output, &MetadataConfig::Privacy).unwrap();
+    assert!(output.exists());
+}
+
+fn create_test_png(path: &Path) {
+    let img = image::RgbaImage::from_fn(100, 80, |x, y| {
+        image::Rgba([(x % 256) as u8, (y % 256) as u8, 128, 255])
+    });
+    img.save_with_format(path, image::ImageFormat::Png).unwrap();
+}
+
+#[test]
+fn strip_png_metadata_produces_valid_png() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("test.png");
+    let output = dir.path().join("stripped.png");
+    create_test_png(&input);
+
+    strip_metadata(&input, &output, &MetadataConfig::StripAll).unwrap();
+    assert!(output.exists());
+    // Output must be a valid PNG that can be opened
+    let img = image::open(&output).unwrap();
+    assert_eq!(img.width(), 100);
+    assert_eq!(img.height(), 80);
+}
+
+#[test]
+fn strip_png_removes_text_chunks() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("test.png");
+    let output = dir.path().join("stripped.png");
+    create_test_png(&input);
+
+    strip_metadata(&input, &output, &MetadataConfig::StripAll).unwrap();
+    // Read output and verify no tEXt chunks remain
+    let data = std::fs::read(&output).unwrap();
+    let mut pos = 8; // skip PNG signature
+    while pos + 12 <= data.len() {
+        let chunk_len = u32::from_be_bytes([data[pos], data[pos+1], data[pos+2], data[pos+3]]) as usize;
+        let chunk_type = &data[pos+4..pos+8];
+        assert_ne!(chunk_type, b"tEXt", "tEXt chunk should be stripped");
+        assert_ne!(chunk_type, b"iTXt", "iTXt chunk should be stripped");
+        assert_ne!(chunk_type, b"zTXt", "zTXt chunk should be stripped");
+        pos += 12 + chunk_len;
+    }
+}
+
+#[test]
+fn strip_png_output_smaller_or_equal() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("test.png");
+    let output = dir.path().join("stripped.png");
+    create_test_png(&input);
+
+    let input_size = std::fs::metadata(&input).unwrap().len();
+    strip_metadata(&input, &output, &MetadataConfig::StripAll).unwrap();
+    let output_size = std::fs::metadata(&output).unwrap().len();
+    assert!(output_size <= input_size);
+}
+
+#[test]
+fn strip_jpeg_removes_app1_exif() {
+    let dir = tempfile::tempdir().unwrap();
+    let input = dir.path().join("test.jpg");
+    let output = dir.path().join("stripped.jpg");
+    create_test_jpeg(&input);
+
+    strip_metadata(&input, &output, &MetadataConfig::StripAll).unwrap();
+    // Verify no APP1 (0xFFE1) markers remain
+    let data = std::fs::read(&output).unwrap();
+    let mut i = 2; // skip SOI
+    while i + 1 < data.len() {
+        if data[i] != 0xFF { break; }
+        let marker = data[i + 1];
+        if marker == 0xDA { break; } // SOS - rest is image data
+        assert_ne!(marker, 0xE1, "APP1/EXIF marker should be stripped");
+        if i + 3 < data.len() {
+            let len = ((data[i + 2] as usize) << 8) | (data[i + 3] as usize);
+            i += 2 + len;
+        } else {
+            break;
+        }
+    }
+}

pixstrip-core/tests/operations_tests.rs

@@ -0,0 +1,211 @@
+use pixstrip_core::operations::*;
+use pixstrip_core::types::*;
+
+#[test]
+fn resize_config_width_only() {
+    let config = ResizeConfig::ByWidth(1200);
+    assert_eq!(
+        config.target_for(Dimensions { width: 4000, height: 3000 }),
+        Dimensions { width: 1200, height: 900 }
+    );
+}
+
+#[test]
+fn resize_config_fit_in_box() {
+    let config = ResizeConfig::FitInBox {
+        max: Dimensions { width: 1920, height: 1080 },
+        allow_upscale: false,
+    };
+    let result = config.target_for(Dimensions { width: 4000, height: 3000 });
+    assert_eq!(result.width, 1440);
+    assert_eq!(result.height, 1080);
+}
+
+#[test]
+fn resize_config_exact() {
+    let config = ResizeConfig::Exact(Dimensions { width: 1080, height: 1080 });
+    assert_eq!(
+        config.target_for(Dimensions { width: 4000, height: 3000 }),
+        Dimensions { width: 1080, height: 1080 }
+    );
+}
+
+#[test]
+fn metadata_config_strip_all() {
+    let config = MetadataConfig::StripAll;
+    assert!(config.should_strip_gps());
+    assert!(config.should_strip_camera());
+    assert!(config.should_strip_copyright());
+}
+
+#[test]
+fn metadata_config_privacy() {
+    let config = MetadataConfig::Privacy;
+    assert!(config.should_strip_gps());
+    assert!(config.should_strip_camera());
+    assert!(!config.should_strip_copyright());
+}
+
+#[test]
+fn metadata_config_keep_all() {
+    let config = MetadataConfig::KeepAll;
+    assert!(!config.should_strip_gps());
+    assert!(!config.should_strip_camera());
+    assert!(!config.should_strip_copyright());
+}
+
+#[test]
+fn convert_config_single_format() {
+    let config = ConvertConfig::SingleFormat(ImageFormat::WebP);
+    assert_eq!(config.output_format(ImageFormat::Jpeg), ImageFormat::WebP);
+    assert_eq!(config.output_format(ImageFormat::Png), ImageFormat::WebP);
+}
+
+#[test]
+fn convert_config_keep_original() {
+    let config = ConvertConfig::KeepOriginal;
+    assert_eq!(config.output_format(ImageFormat::Jpeg), ImageFormat::Jpeg);
+    assert_eq!(config.output_format(ImageFormat::Png), ImageFormat::Png);
+}
+
+#[test]
+fn watermark_position_all_nine() {
+    let positions = [
+        WatermarkPosition::TopLeft,
+        WatermarkPosition::TopCenter,
+        WatermarkPosition::TopRight,
+        WatermarkPosition::MiddleLeft,
+        WatermarkPosition::Center,
+        WatermarkPosition::MiddleRight,
+        WatermarkPosition::BottomLeft,
+        WatermarkPosition::BottomCenter,
+        WatermarkPosition::BottomRight,
+    ];
+    assert_eq!(positions.len(), 9);
+}
+
+#[test]
+fn rename_config_simple_template() {
+    let config = RenameConfig {
+        prefix: "blog_".into(),
+        suffix: String::new(),
+        counter_start: 1,
+        counter_padding: 3,
+        counter_enabled: true,
+        counter_position: 3,
+        template: None,
+        case_mode: 0,
+        replace_spaces: 0,
+        special_chars: 0,
+        regex_find: String::new(),
+        regex_replace: String::new(),
+    };
+    let result = config.apply_simple("sunset", "jpg", 1);
+    assert_eq!(result, "blog_sunset_001.jpg");
+}
+
+#[test]
+fn rename_config_with_suffix() {
+    let config = RenameConfig {
+        prefix: String::new(),
+        suffix: "_web".into(),
+        counter_start: 1,
+        counter_padding: 2,
+        counter_enabled: true,
+        counter_position: 3,
+        template: None,
+        case_mode: 0,
+        replace_spaces: 0,
+        special_chars: 0,
+        regex_find: String::new(),
+        regex_replace: String::new(),
+    };
+    let result = config.apply_simple("photo", "webp", 5);
+    assert_eq!(result, "photo_web_05.webp");
+}
+
+#[test]
+fn rename_counter_overflow_saturates() {
+    let config = RenameConfig {
+        prefix: String::new(),
+        suffix: String::new(),
+        counter_start: u32::MAX,
+        counter_padding: 1,
+        counter_enabled: true,
+        counter_position: 3,
+        template: None,
+        case_mode: 0,
+        replace_spaces: 0,
+        special_chars: 0,
+        regex_find: String::new(),
+        regex_replace: String::new(),
+    };
+    // Should not panic - saturating arithmetic
+    let result = config.apply_simple("photo", "jpg", u32::MAX);
+    assert!(result.contains("photo"));
+}
+
+#[test]
+fn metadata_config_custom_selective() {
+    let config = MetadataConfig::Custom {
+        strip_gps: true,
+        strip_camera: false,
+        strip_software: true,
+        strip_timestamps: false,
+        strip_copyright: false,
+    };
+    assert!(config.should_strip_gps());
+    assert!(!config.should_strip_camera());
+    assert!(!config.should_strip_copyright());
+}
+
+#[test]
+fn metadata_config_custom_all_off() {
+    let config = MetadataConfig::Custom {
+        strip_gps: false,
+        strip_camera: false,
+        strip_software: false,
+        strip_timestamps: false,
+        strip_copyright: false,
+    };
+    assert!(!config.should_strip_gps());
+    assert!(!config.should_strip_camera());
+    assert!(!config.should_strip_copyright());
+}
+
+#[test]
+fn metadata_config_custom_all_on() {
+    let config = MetadataConfig::Custom {
+        strip_gps: true,
+        strip_camera: true,
+        strip_software: true,
+        strip_timestamps: true,
+        strip_copyright: true,
+    };
+    assert!(config.should_strip_gps());
+    assert!(config.should_strip_camera());
+    assert!(config.should_strip_copyright());
+}
+
+#[test]
+fn watermark_rotation_variants_exist() {
+    let rotations = [
+        WatermarkRotation::Degrees45,
+        WatermarkRotation::DegreesNeg45,
+        WatermarkRotation::Degrees90,
+        WatermarkRotation::Custom(30.0),
+    ];
+    assert_eq!(rotations.len(), 4);
+}
+
+#[test]
+fn rotation_auto_orient_variant() {
+    let rotation = Rotation::AutoOrient;
+    assert!(matches!(rotation, Rotation::AutoOrient));
+}
+
+#[test]
+fn overwrite_action_default_is_auto_rename() {
+    let default = OverwriteAction::default();
+    assert!(matches!(default, OverwriteAction::AutoRename));
+}

pixstrip-core/tests/pipeline_tests.rs

@@ -0,0 +1,61 @@
+use pixstrip_core::pipeline::*;
+use pixstrip_core::operations::*;
+use pixstrip_core::types::*;
+
+#[test]
+fn processing_job_default_has_no_operations() {
+    let job = ProcessingJob::new("/tmp/input/", "/tmp/output/");
+    assert!(job.resize.is_none());
+    assert!(job.convert.is_none());
+    assert!(job.compress.is_none());
+    assert!(job.metadata.is_none());
+    assert!(job.watermark.is_none());
+    assert!(job.rename.is_none());
+    assert!(job.sources.is_empty());
+}
+
+#[test]
+fn processing_job_add_sources() {
+    let mut job = ProcessingJob::new("/tmp/input/", "/tmp/output/");
+    job.add_source("/tmp/input/photo.jpg");
+    job.add_source("/tmp/input/image.png");
+    assert_eq!(job.sources.len(), 2);
+    assert_eq!(job.sources[0].original_format, Some(ImageFormat::Jpeg));
+    assert_eq!(job.sources[1].original_format, Some(ImageFormat::Png));
+}
+
+#[test]
+fn processing_job_with_resize() {
+    let mut job = ProcessingJob::new("/tmp/input/", "/tmp/output/");
+    job.resize = Some(ResizeConfig::ByWidth(1200));
+    assert!(job.resize.is_some());
+}
+
+#[test]
+fn processing_job_operation_count() {
+    let mut job = ProcessingJob::new("/tmp/input/", "/tmp/output/");
+    assert_eq!(job.operation_count(), 0);
+    job.resize = Some(ResizeConfig::ByWidth(1200));
+    assert_eq!(job.operation_count(), 1);
+    job.compress = Some(CompressConfig::Preset(QualityPreset::High));
+    assert_eq!(job.operation_count(), 2);
+    job.metadata = Some(MetadataConfig::StripAll);
+    assert_eq!(job.operation_count(), 3);
+}
+
+#[test]
+fn processing_job_output_path() {
+    let job = ProcessingJob::new("/tmp/input/", "/tmp/output/");
+    let source = ImageSource::from_path("/tmp/input/photo.jpg");
+    let output = job.output_path_for(&source, None);
+    assert_eq!(output.to_str().unwrap(), "/tmp/output/photo.jpg");
+}
+
+#[test]
+fn processing_job_output_path_with_format_change() {
+    let mut job = ProcessingJob::new("/tmp/input/", "/tmp/output/");
+    job.convert = Some(ConvertConfig::SingleFormat(ImageFormat::WebP));
+    let source = ImageSource::from_path("/tmp/input/photo.jpg");
+    let output = job.output_path_for(&source, Some(ImageFormat::WebP));
+    assert_eq!(output.to_str().unwrap(), "/tmp/output/photo.webp");
+}

pixstrip-core/tests/preset_tests.rs

@@ -0,0 +1,59 @@
+use pixstrip_core::preset::*;
+use pixstrip_core::operations::*;
+
+#[test]
+fn builtin_preset_blog_photos() {
+    let preset = Preset::builtin_blog_photos();
+    assert_eq!(preset.name, "Blog Photos");
+    assert!(preset.resize.is_some());
+    assert!(preset.compress.is_some());
+    assert!(preset.metadata.is_some());
+    assert!(!preset.is_custom);
+}
+
+#[test]
+fn builtin_preset_privacy_clean() {
+    let preset = Preset::builtin_privacy_clean();
+    assert_eq!(preset.name, "Privacy Clean");
+    assert!(preset.resize.is_none());
+    assert!(preset.compress.is_none());
+    assert!(preset.metadata.is_some());
+    if let Some(MetadataConfig::StripAll) = &preset.metadata {
+        // correct
+    } else {
+        panic!("Expected StripAll metadata config");
+    }
+}
+
+#[test]
+fn preset_serialization_roundtrip() {
+    let preset = Preset::builtin_blog_photos();
+    let json = serde_json::to_string_pretty(&preset).unwrap();
+    let deserialized: Preset = serde_json::from_str(&json).unwrap();
+    assert_eq!(deserialized.name, preset.name);
+    assert_eq!(deserialized.is_custom, preset.is_custom);
+}
+
+#[test]
+fn all_builtin_presets() {
+    let presets = Preset::all_builtins();
+    assert_eq!(presets.len(), 9);
+    let names: Vec<&str> = presets.iter().map(|p| p.name.as_str()).collect();
+    assert!(names.contains(&"Blog Photos"));
+    assert!(names.contains(&"Social Media"));
+    assert!(names.contains(&"Web Optimization"));
+    assert!(names.contains(&"Email Friendly"));
+    assert!(names.contains(&"Privacy Clean"));
+    assert!(names.contains(&"Photographer Export"));
+    assert!(names.contains(&"Archive Compress"));
+    assert!(names.contains(&"Fediverse Ready"));
+}
+
+#[test]
+fn preset_to_processing_job() {
+    let preset = Preset::builtin_blog_photos();
+    let job = preset.to_job("/tmp/input/", "/tmp/output/");
+    assert!(job.resize.is_some());
+    assert!(job.compress.is_some());
+    assert!(job.metadata.is_some());
+}

pixstrip-core/tests/rename_tests.rs

@@ -0,0 +1,280 @@
+use pixstrip_core::operations::rename::{
+    apply_template, apply_regex_replace, apply_space_replacement,
+    apply_special_chars, apply_case_conversion, resolve_collision,
+};
+
+#[test]
+fn template_basic_variables() {
+    let result = apply_template(
+        "{name}_{counter:3}.{ext}",
+        "sunset",
+        "jpg",
+        1,
+        None,
+    );
+    assert_eq!(result, "sunset_001.jpg");
+}
+
+#[test]
+fn template_with_prefix() {
+    let result = apply_template(
+        "blog_{name}.{ext}",
+        "photo",
+        "webp",
+        1,
+        None,
+    );
+    assert_eq!(result, "blog_photo.webp");
+}
+
+#[test]
+fn template_counter_padding() {
+    let result = apply_template(
+        "{name}_{counter:4}.{ext}",
+        "img",
+        "png",
+        42,
+        None,
+    );
+    assert_eq!(result, "img_0042.png");
+}
+
+#[test]
+fn template_counter_no_padding() {
+    let result = apply_template(
+        "{name}_{counter}.{ext}",
+        "img",
+        "png",
+        42,
+        None,
+    );
+    assert_eq!(result, "img_42.png");
+}
+
+#[test]
+fn template_width_height() {
+    let result = apply_template(
+        "{name}_{width}x{height}.{ext}",
+        "photo",
+        "jpg",
+        1,
+        Some((1920, 1080)),
+    );
+    assert_eq!(result, "photo_1920x1080.jpg");
+}
+
+#[test]
+fn collision_adds_suffix() {
+    let dir = tempfile::tempdir().unwrap();
+    let base = dir.path().join("photo.jpg");
+    std::fs::write(&base, b"exists").unwrap();
+
+    let resolved = resolve_collision(&base);
+    assert_eq!(
+        resolved.file_name().unwrap().to_str().unwrap(),
+        "photo_1.jpg"
+    );
+}
+
+#[test]
+fn collision_increments() {
+    let dir = tempfile::tempdir().unwrap();
+    std::fs::write(dir.path().join("photo.jpg"), b"exists").unwrap();
+    std::fs::write(dir.path().join("photo_1.jpg"), b"exists").unwrap();
+
+    let resolved = resolve_collision(&dir.path().join("photo.jpg"));
+    assert_eq!(
+        resolved.file_name().unwrap().to_str().unwrap(),
+        "photo_2.jpg"
+    );
+}
+
+#[test]
+fn no_collision_returns_same() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("unique.jpg");
+    let resolved = resolve_collision(&path);
+    assert_eq!(resolved, path);
+}
+
+// --- Regex replace tests ---
+
+#[test]
+fn regex_replace_basic() {
+    let result = apply_regex_replace("hello_world", "_", "-");
+    assert_eq!(result, "hello-world");
+}
+
+#[test]
+fn regex_replace_pattern() {
+    let result = apply_regex_replace("IMG_20260307_001", r"\d{8}", "DATE");
+    assert_eq!(result, "IMG_DATE_001");
+}
+
+#[test]
+fn regex_replace_invalid_pattern_returns_original() {
+    let result = apply_regex_replace("hello", "[invalid", "x");
+    assert_eq!(result, "hello");
+}
+
+#[test]
+fn regex_replace_empty_find_returns_original() {
+    let result = apply_regex_replace("hello", "", "x");
+    assert_eq!(result, "hello");
+}
+
+// --- Space replacement tests ---
+
+#[test]
+fn space_replacement_none() {
+    assert_eq!(apply_space_replacement("hello world", 0), "hello world");
+}
+
+#[test]
+fn space_replacement_underscore() {
+    assert_eq!(apply_space_replacement("hello world", 1), "hello_world");
+}
+
+#[test]
+fn space_replacement_hyphen() {
+    assert_eq!(apply_space_replacement("hello world", 2), "hello-world");
+}
+
+#[test]
+fn space_replacement_dot() {
+    assert_eq!(apply_space_replacement("hello world", 3), "hello.world");
+}
+
+#[test]
+fn space_replacement_camelcase() {
+    assert_eq!(apply_space_replacement("hello world", 4), "helloWorld");
+}
+
+#[test]
+fn space_replacement_remove() {
+    assert_eq!(apply_space_replacement("hello world", 5), "helloworld");
+}
+
+// --- Special chars tests ---
+
+#[test]
+fn special_chars_keep_all() {
+    assert_eq!(apply_special_chars("file<name>.txt", 0), "file<name>.txt");
+}
+
+#[test]
+fn special_chars_filesystem_safe() {
+    assert_eq!(apply_special_chars("file<name>", 1), "filename");
+}
+
+#[test]
+fn special_chars_web_safe() {
+    assert_eq!(apply_special_chars("file name!@#", 2), "filename");
+}
+
+#[test]
+fn special_chars_alphanumeric_only() {
+    assert_eq!(apply_special_chars("file-name_123", 5), "filename123");
+}
+
+// --- Case conversion tests ---
+
+#[test]
+fn case_conversion_none() {
+    assert_eq!(apply_case_conversion("Hello World", 0), "Hello World");
+}
+
+#[test]
+fn case_conversion_lowercase() {
+    assert_eq!(apply_case_conversion("Hello World", 1), "hello world");
+}
+
+#[test]
+fn case_conversion_uppercase() {
+    assert_eq!(apply_case_conversion("Hello World", 2), "HELLO WORLD");
+}
+
+#[test]
+fn case_conversion_title_case() {
+    assert_eq!(apply_case_conversion("hello world", 3), "Hello World");
+}
+
+#[test]
+fn case_conversion_title_preserves_separators() {
+    assert_eq!(apply_case_conversion("hello-world_foo", 3), "Hello-World_Foo");
+}
+
+// --- RenameConfig::apply_simple edge cases ---
+
+use pixstrip_core::operations::RenameConfig;
+
+fn default_rename_config() -> RenameConfig {
+    RenameConfig {
+        prefix: String::new(),
+        suffix: String::new(),
+        counter_start: 1,
+        counter_padding: 3,
+        counter_enabled: false,
+        counter_position: 3,
+        template: None,
+        case_mode: 0,
+        replace_spaces: 0,
+        special_chars: 0,
+        regex_find: String::new(),
+        regex_replace: String::new(),
+    }
+}
+
+#[test]
+fn apply_simple_no_changes() {
+    let cfg = default_rename_config();
+    assert_eq!(cfg.apply_simple("photo", "jpg", 1), "photo.jpg");
+}
+
+#[test]
+fn apply_simple_with_prefix_suffix() {
+    let mut cfg = default_rename_config();
+    cfg.prefix = "web_".into();
+    cfg.suffix = "_final".into();
+    assert_eq!(cfg.apply_simple("photo", "jpg", 1), "web_photo_final.jpg");
+}
+
+#[test]
+fn apply_simple_counter_after_suffix() {
+    let mut cfg = default_rename_config();
+    cfg.counter_enabled = true;
+    cfg.counter_position = 3;
+    assert_eq!(cfg.apply_simple("photo", "jpg", 1), "photo_001.jpg");
+}
+
+#[test]
+fn apply_simple_counter_replaces_name() {
+    let mut cfg = default_rename_config();
+    cfg.counter_enabled = true;
+    cfg.counter_position = 4;
+    assert_eq!(cfg.apply_simple("photo", "jpg", 1), "001.jpg");
+}
+
+#[test]
+fn apply_simple_empty_name() {
+    let cfg = default_rename_config();
+    assert_eq!(cfg.apply_simple("", "png", 1), ".png");
+}
+
+#[test]
+fn apply_simple_case_lowercase() {
+    let mut cfg = default_rename_config();
+    cfg.case_mode = 1;
+    assert_eq!(cfg.apply_simple("MyPhoto", "JPG", 1), "myphoto.JPG");
+}
+
+#[test]
+fn apply_simple_large_counter_padding_capped() {
+    let mut cfg = default_rename_config();
+    cfg.counter_enabled = true;
+    cfg.counter_padding = 100; // should be capped to 10
+    cfg.counter_position = 3;
+    let result = cfg.apply_simple("photo", "jpg", 1);
+    // Counter portion should be at most 10 digits
+    assert!(result.len() <= 22); // "photo_" + 10 digits + ".jpg"
+}

pixstrip-core/tests/resize_tests.rs

@@ -0,0 +1,61 @@
+use pixstrip_core::operations::resize::resize_image;
+use pixstrip_core::operations::ResizeConfig;
+use pixstrip_core::types::Dimensions;
+
+fn create_test_image(width: u32, height: u32) -> image::DynamicImage {
+    let img = image::RgbImage::from_fn(width, height, |x, y| {
+        image::Rgb([(x % 256) as u8, (y % 256) as u8, 128])
+    });
+    image::DynamicImage::ImageRgb8(img)
+}
+
+#[test]
+fn resize_by_width() {
+    let img = create_test_image(4000, 3000);
+    let config = ResizeConfig::ByWidth(1200);
+    let result = resize_image(&img, &config).unwrap();
+    assert_eq!(result.width(), 1200);
+    assert_eq!(result.height(), 900);
+}
+
+#[test]
+fn resize_by_height() {
+    let img = create_test_image(4000, 3000);
+    let config = ResizeConfig::ByHeight(600);
+    let result = resize_image(&img, &config).unwrap();
+    assert_eq!(result.width(), 800);
+    assert_eq!(result.height(), 600);
+}
+
+#[test]
+fn resize_fit_in_box() {
+    let img = create_test_image(4000, 3000);
+    let config = ResizeConfig::FitInBox {
+        max: Dimensions { width: 1920, height: 1080 },
+        allow_upscale: false,
+    };
+    let result = resize_image(&img, &config).unwrap();
+    assert_eq!(result.width(), 1440);
+    assert_eq!(result.height(), 1080);
+}
+
+#[test]
+fn resize_no_upscale() {
+    let img = create_test_image(800, 600);
+    let config = ResizeConfig::FitInBox {
+        max: Dimensions { width: 1920, height: 1080 },
+        allow_upscale: false,
+    };
+    let result = resize_image(&img, &config).unwrap();
+    assert_eq!(result.width(), 800);
+    assert_eq!(result.height(), 600);
+}
+
+#[test]
+fn resize_exact() {
+    let img = create_test_image(4000, 3000);
+    let config = ResizeConfig::Exact(Dimensions { width: 1080, height: 1080 });
+    let result = resize_image(&img, &config).unwrap();
+    assert_eq!(result.width(), 1080);
+    assert_eq!(result.height(), 1080);
+}

pixstrip-core/tests/storage_tests.rs

@@ -0,0 +1,282 @@
+use pixstrip_core::preset::Preset;
+use pixstrip_core::storage::*;
+
+fn with_temp_config_dir(f: impl FnOnce(&std::path::Path)) {
+    let dir = tempfile::tempdir().unwrap();
+    f(dir.path());
+}
+
+// --- Preset file I/O ---
+
+#[test]
+fn save_and_load_preset() {
+    with_temp_config_dir(|base| {
+        let store = PresetStore::with_base_dir(base);
+        let preset = Preset::builtin_blog_photos();
+
+        store.save(&preset).unwrap();
+        let loaded = store.load("Blog Photos").unwrap();
+
+        assert_eq!(loaded.name, preset.name);
+        assert_eq!(loaded.is_custom, preset.is_custom);
+    });
+}
+
+#[test]
+fn save_preset_creates_directory() {
+    with_temp_config_dir(|base| {
+        let presets_dir = base.join("presets");
+        assert!(!presets_dir.exists());
+
+        let store = PresetStore::with_base_dir(base);
+        let preset = Preset::builtin_blog_photos();
+        store.save(&preset).unwrap();
+
+        assert!(presets_dir.exists());
+    });
+}
+
+#[test]
+fn list_saved_presets() {
+    with_temp_config_dir(|base| {
+        let store = PresetStore::with_base_dir(base);
+        store.save(&Preset::builtin_blog_photos()).unwrap();
+        store.save(&Preset::builtin_privacy_clean()).unwrap();
+
+        let list = store.list().unwrap();
+        assert_eq!(list.len(), 2);
+
+        let names: Vec<&str> = list.iter().map(|p| p.name.as_str()).collect();
+        assert!(names.contains(&"Blog Photos"));
+        assert!(names.contains(&"Privacy Clean"));
+    });
+}
+
+#[test]
+fn delete_preset() {
+    with_temp_config_dir(|base| {
+        let store = PresetStore::with_base_dir(base);
+        store.save(&Preset::builtin_blog_photos()).unwrap();
+
+        assert!(store.delete("Blog Photos").is_ok());
+        assert!(store.load("Blog Photos").is_err());
+    });
+}
+
+#[test]
+fn load_nonexistent_preset_returns_error() {
+    with_temp_config_dir(|base| {
+        let store = PresetStore::with_base_dir(base);
+        assert!(store.load("Nonexistent").is_err());
+    });
+}
+
+#[test]
+fn preset_filename_sanitization() {
+    with_temp_config_dir(|base| {
+        let store = PresetStore::with_base_dir(base);
+        let mut preset = Preset::builtin_blog_photos();
+        preset.name = "My Preset / With <Special> Chars!".into();
+        preset.is_custom = true;
+
+        store.save(&preset).unwrap();
+        let loaded = store.load("My Preset / With <Special> Chars!").unwrap();
+        assert_eq!(loaded.name, preset.name);
+    });
+}
+
+// --- Preset import/export ---
+
+#[test]
+fn export_and_import_preset() {
+    with_temp_config_dir(|base| {
+        let store = PresetStore::with_base_dir(base);
+        let preset = Preset::builtin_blog_photos();
+
+        let export_path = base.join("exported.pixstrip-preset");
+        store.export_to_file(&preset, &export_path).unwrap();
+
+        assert!(export_path.exists());
+
+        let imported = store.import_from_file(&export_path).unwrap();
+        assert_eq!(imported.name, preset.name);
+        assert!(imported.is_custom);
+    });
+}
+
+#[test]
+fn import_preset_marks_as_custom() {
+    with_temp_config_dir(|base| {
+        let store = PresetStore::with_base_dir(base);
+        let preset = Preset::builtin_blog_photos();
+
+        let export_path = base.join("test.pixstrip-preset");
+        store.export_to_file(&preset, &export_path).unwrap();
+
+        let imported = store.import_from_file(&export_path).unwrap();
+        assert!(imported.is_custom);
+    });
+}
+
+// --- Config persistence ---
+
+#[test]
+fn save_and_load_config() {
+    with_temp_config_dir(|base| {
+        let config_store = ConfigStore::with_base_dir(base);
+        let config = pixstrip_core::config::AppConfig {
+            output_subfolder: "output_images".into(),
+            auto_open_output: true,
+            ..Default::default()
+        };
+
+        config_store.save(&config).unwrap();
+        let loaded = config_store.load().unwrap();
+
+        assert_eq!(loaded.output_subfolder, "output_images");
+        assert!(loaded.auto_open_output);
+    });
+}
+
+#[test]
+fn load_missing_config_returns_default() {
+    with_temp_config_dir(|base| {
+        let config_store = ConfigStore::with_base_dir(base);
+        let config = config_store.load().unwrap();
+        let default = pixstrip_core::config::AppConfig::default();
+
+        assert_eq!(config.output_subfolder, default.output_subfolder);
+    });
+}
+
+// --- Session memory ---
+
+#[test]
+fn save_and_load_session() {
+    with_temp_config_dir(|base| {
+        let session_store = SessionStore::with_base_dir(base);
+        let session = SessionState {
+            last_input_dir: Some("/home/user/photos".into()),
+            last_output_dir: Some("/home/user/processed".into()),
+            last_preset_name: Some("Blog Photos".into()),
+            current_step: 3,
+            window_width: Some(1024),
+            window_height: Some(768),
+            window_maximized: false,
+            ..Default::default()
+        };
+
+        session_store.save(&session).unwrap();
+        let loaded = session_store.load().unwrap();
+
+        assert_eq!(loaded.last_input_dir.as_deref(), Some("/home/user/photos"));
+        assert_eq!(loaded.current_step, 3);
+    });
+}
+
+#[test]
+fn load_missing_session_returns_default() {
+    with_temp_config_dir(|base| {
+        let session_store = SessionStore::with_base_dir(base);
+        let session = session_store.load().unwrap();
+        assert_eq!(session.current_step, 0);
+        assert!(session.last_input_dir.is_none());
+    });
+}
+
+// --- Processing history ---
+
+#[test]
+fn add_and_list_history_entries() {
+    with_temp_config_dir(|base| {
+        let history = HistoryStore::with_base_dir(base);
+
+        let entry = HistoryEntry {
+            timestamp: "2026-03-06T12:00:00Z".into(),
+            input_dir: "/home/user/photos".into(),
+            output_dir: "/home/user/processed".into(),
+            preset_name: Some("Blog Photos".into()),
+            total: 10,
+            succeeded: 9,
+            failed: 1,
+            total_input_bytes: 50_000_000,
+            total_output_bytes: 10_000_000,
+            elapsed_ms: 5000,
+            output_files: vec![
+                "/home/user/processed/photo1.jpg".into(),
+                "/home/user/processed/photo2.jpg".into(),
+            ],
+        };
+
+        history.add(entry.clone(), 50, 30).unwrap();
+        let entries = history.list().unwrap();
+
+        assert_eq!(entries.len(), 1);
+        assert_eq!(entries[0].total, 10);
+        assert_eq!(entries[0].succeeded, 9);
+    });
+}
+
+#[test]
+fn history_appends_entries() {
+    with_temp_config_dir(|base| {
+        let history = HistoryStore::with_base_dir(base);
+
+        for i in 0..3 {
+            history
+                .add(HistoryEntry {
+                    timestamp: format!("2026-03-06T12:0{}:00Z", i),
+                    input_dir: "/input".into(),
+                    output_dir: "/output".into(),
+                    preset_name: None,
+                    total: i + 1,
+                    succeeded: i + 1,
+                    failed: 0,
+                    total_input_bytes: 1000,
+                    total_output_bytes: 500,
+                    elapsed_ms: 100,
+                    output_files: vec![],
+                }, 50, 30)
+                .unwrap();
+        }
+
+        let entries = history.list().unwrap();
+        assert_eq!(entries.len(), 3);
+    });
+}
+
+#[test]
+fn clear_history() {
+    with_temp_config_dir(|base| {
+        let history = HistoryStore::with_base_dir(base);
+
+        history
+            .add(HistoryEntry {
+                timestamp: "2026-03-06T12:00:00Z".into(),
+                input_dir: "/input".into(),
+                output_dir: "/output".into(),
+                preset_name: None,
+                total: 1,
+                succeeded: 1,
+                failed: 0,
+                total_input_bytes: 1000,
+                total_output_bytes: 500,
+                elapsed_ms: 100,
+                output_files: vec![],
+            }, 50, 30)
+            .unwrap();
+
+        history.clear().unwrap();
+        let entries = history.list().unwrap();
+        assert!(entries.is_empty());
+    });
+}
+
+#[test]
+fn empty_history_returns_empty_list() {
+    with_temp_config_dir(|base| {
+        let history = HistoryStore::with_base_dir(base);
+        let entries = history.list().unwrap();
+        assert!(entries.is_empty());
+    });
+}

pixstrip-core/tests/types_tests.rs

@@ -81,3 +81,39 @@ fn quality_preset_values() {
     assert!(QualityPreset::High.jpeg_quality() > QualityPreset::Medium.jpeg_quality());
     assert!(QualityPreset::Medium.jpeg_quality() > QualityPreset::Low.jpeg_quality());
 }
+
+#[test]
+fn dimensions_zero_height_aspect_ratio() {
+    let dims = Dimensions { width: 1920, height: 0 };
+    assert_eq!(dims.aspect_ratio(), 1.0);
+}
+
+#[test]
+fn dimensions_zero_both_aspect_ratio() {
+    let dims = Dimensions { width: 0, height: 0 };
+    assert_eq!(dims.aspect_ratio(), 1.0);
+}
+
+#[test]
+fn dimensions_fit_within_zero_self_width() {
+    let original = Dimensions { width: 0, height: 600 };
+    let max_box = Dimensions { width: 1200, height: 1200 };
+    let fitted = original.fit_within(max_box, false);
+    assert_eq!(fitted, original);
+}
+
+#[test]
+fn dimensions_fit_within_zero_self_height() {
+    let original = Dimensions { width: 800, height: 0 };
+    let max_box = Dimensions { width: 1200, height: 1200 };
+    let fitted = original.fit_within(max_box, false);
+    assert_eq!(fitted, original);
+}
+
+#[test]
+fn dimensions_fit_within_zero_max() {
+    let original = Dimensions { width: 800, height: 600 };
+    let max_box = Dimensions { width: 0, height: 0 };
+    let fitted = original.fit_within(max_box, false);
+    assert_eq!(fitted, original);
+}

pixstrip-core/tests/watcher_tests.rs

@@ -0,0 +1,115 @@
+use pixstrip_core::watcher::*;
+use std::sync::mpsc;
+
+#[test]
+fn watch_folder_serialization() {
+    let folder = WatchFolder {
+        path: "/home/user/photos".into(),
+        preset_name: "Blog Photos".into(),
+        recursive: true,
+        active: true,
+    };
+
+    let json = serde_json::to_string(&folder).unwrap();
+    let deserialized: WatchFolder = serde_json::from_str(&json).unwrap();
+    assert_eq!(deserialized.preset_name, "Blog Photos");
+    assert!(deserialized.recursive);
+}
+
+#[test]
+fn watcher_starts_and_stops() {
+    let dir = tempfile::tempdir().unwrap();
+    let folder = WatchFolder {
+        path: dir.path().to_path_buf(),
+        preset_name: "Test".into(),
+        recursive: false,
+        active: true,
+    };
+
+    let watcher = FolderWatcher::new();
+    let (tx, _rx) = mpsc::channel();
+
+    watcher.start(&folder, tx).unwrap();
+    assert!(watcher.is_running());
+
+    watcher.stop();
+    // Give the thread time to see the stop signal
+    std::thread::sleep(std::time::Duration::from_millis(600));
+    assert!(!watcher.is_running());
+}
+
+#[test]
+fn watcher_detects_new_image() {
+    let dir = tempfile::tempdir().unwrap();
+    let folder = WatchFolder {
+        path: dir.path().to_path_buf(),
+        preset_name: "Test".into(),
+        recursive: false,
+        active: true,
+    };
+
+    let watcher = FolderWatcher::new();
+    let (tx, rx) = mpsc::channel();
+
+    watcher.start(&folder, tx).unwrap();
+
+    // Wait for watcher to be ready
+    std::thread::sleep(std::time::Duration::from_millis(500));
+
+    // Create an image file
+    let img_path = dir.path().join("new_photo.jpg");
+    std::fs::write(&img_path, b"fake jpeg data").unwrap();
+
+    // Wait and check for event
+    let event = rx.recv_timeout(std::time::Duration::from_secs(3));
+    watcher.stop();
+
+    match event {
+        Ok(WatchEvent::NewImage(path)) => {
+            assert_eq!(path, img_path);
+        }
+        Ok(WatchEvent::Error(e)) => panic!("Unexpected error: {}", e),
+        Err(_) => panic!("No event received within timeout"),
+    }
+}
+
+#[test]
+fn watcher_ignores_non_image_files() {
+    let dir = tempfile::tempdir().unwrap();
+    let folder = WatchFolder {
+        path: dir.path().to_path_buf(),
+        preset_name: "Test".into(),
+        recursive: false,
+        active: true,
+    };
+
+    let watcher = FolderWatcher::new();
+    let (tx, rx) = mpsc::channel();
+
+    watcher.start(&folder, tx).unwrap();
+    std::thread::sleep(std::time::Duration::from_millis(500));
+
+    // Create a non-image file
+    std::fs::write(dir.path().join("readme.txt"), b"text file").unwrap();
+
+    // Should not receive any event
+    let result = rx.recv_timeout(std::time::Duration::from_secs(1));
+    watcher.stop();
+
+    assert!(result.is_err(), "Should not receive event for non-image file");
+}
+
+#[test]
+fn watcher_rejects_nonexistent_path() {
+    let folder = WatchFolder {
+        path: "/nonexistent/path/to/watch".into(),
+        preset_name: "Test".into(),
+        recursive: false,
+        active: true,
+    };
+
+    let watcher = FolderWatcher::new();
+    let (tx, _rx) = mpsc::channel();
+
+    assert!(watcher.start(&folder, tx).is_err());
+}

pixstrip-core/tests/watermark_tests.rs

@@ -0,0 +1,245 @@
+use pixstrip_core::operations::watermark::calculate_position;
+use pixstrip_core::operations::WatermarkPosition;
+use pixstrip_core::types::Dimensions;
+
+#[test]
+fn position_top_left() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::TopLeft,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 10);
+    assert_eq!(y, 10);
+}
+
+#[test]
+fn position_center() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::Center,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 860);  // (1920 - 200) / 2
+    assert_eq!(y, 515);  // (1080 - 50) / 2
+}
+
+#[test]
+fn position_bottom_right() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::BottomRight,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 1710); // 1920 - 200 - 10
+    assert_eq!(y, 1020); // 1080 - 50 - 10
+}
+
+#[test]
+fn position_top_center() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::TopCenter,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 860); // (1920 - 200) / 2
+    assert_eq!(y, 10);
+}
+
+#[test]
+fn position_bottom_center() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::BottomCenter,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 860);
+    assert_eq!(y, 1020);
+}
+
+#[test]
+fn position_middle_left() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::MiddleLeft,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 10);
+    assert_eq!(y, 515);
+}
+
+#[test]
+fn position_middle_right() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::MiddleRight,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 1710);
+    assert_eq!(y, 515);
+}
+
+#[test]
+fn position_top_right() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::TopRight,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 1710);
+    assert_eq!(y, 10);
+}
+
+#[test]
+fn position_bottom_left() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::BottomLeft,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 10);
+    assert_eq!(y, 1020);
+}
+
+// --- Margin variation tests ---
+
+#[test]
+fn margin_zero_top_left() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::TopLeft,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        0,
+    );
+    assert_eq!(x, 0);
+    assert_eq!(y, 0);
+}
+
+#[test]
+fn margin_zero_bottom_right() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::BottomRight,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        0,
+    );
+    assert_eq!(x, 1720); // 1920 - 200
+    assert_eq!(y, 1030); // 1080 - 50
+}
+
+#[test]
+fn large_margin_top_left() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::TopLeft,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        100,
+    );
+    assert_eq!(x, 100);
+    assert_eq!(y, 100);
+}
+
+#[test]
+fn large_margin_bottom_right() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::BottomRight,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        100,
+    );
+    assert_eq!(x, 1620); // 1920 - 200 - 100
+    assert_eq!(y, 930);  // 1080 - 50 - 100
+}
+
+#[test]
+fn margin_does_not_affect_center() {
+    let (x1, y1) = calculate_position(
+        WatermarkPosition::Center,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        0,
+    );
+    let (x2, y2) = calculate_position(
+        WatermarkPosition::Center,
+        Dimensions { width: 1920, height: 1080 },
+        Dimensions { width: 200, height: 50 },
+        100,
+    );
+    assert_eq!(x1, x2);
+    assert_eq!(y1, y2);
+}
+
+// --- Edge case tests ---
+
+#[test]
+fn watermark_larger_than_image() {
+    // Watermark is bigger than the image - should not panic, saturating_sub clamps to 0
+    let (x, y) = calculate_position(
+        WatermarkPosition::BottomRight,
+        Dimensions { width: 100, height: 100 },
+        Dimensions { width: 200, height: 200 },
+        10,
+    );
+    // (100 - 200 - 10) saturates to 0
+    assert_eq!(x, 0);
+    assert_eq!(y, 0);
+}
+
+#[test]
+fn watermark_exact_image_size() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::Center,
+        Dimensions { width: 200, height: 100 },
+        Dimensions { width: 200, height: 100 },
+        0,
+    );
+    assert_eq!(x, 0);
+    assert_eq!(y, 0);
+}
+
+#[test]
+fn zero_size_image() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::Center,
+        Dimensions { width: 0, height: 0 },
+        Dimensions { width: 200, height: 50 },
+        10,
+    );
+    assert_eq!(x, 0);
+    assert_eq!(y, 0);
+}
+
+#[test]
+fn margin_exceeds_available_space() {
+    // Margin is huge relative to image size
+    let (x, y) = calculate_position(
+        WatermarkPosition::BottomRight,
+        Dimensions { width: 100, height: 100 },
+        Dimensions { width: 50, height: 50 },
+        200,
+    );
+    // saturating_sub: 100 - 50 - 200 = 0
+    assert_eq!(x, 0);
+    assert_eq!(y, 0);
+}
+
+#[test]
+fn one_pixel_image() {
+    let (x, y) = calculate_position(
+        WatermarkPosition::TopLeft,
+        Dimensions { width: 1, height: 1 },
+        Dimensions { width: 1, height: 1 },
+        0,
+    );
+    assert_eq!(x, 0);
+    assert_eq!(y, 0);
+}

pixstrip-gtk/Cargo.toml

@@ -8,3 +8,5 @@ license.workspace = true
 pixstrip-core = { workspace = true }
 gtk = { package = "gtk4", version = "0.11.0", features = ["gnome_49"] }
 adw = { package = "libadwaita", version = "0.9.1", features = ["v1_8"] }
+image = "0.25"
+regex = "1"

pixstrip-gtk/src/main.rs

@@ -1,3 +1,16 @@
+mod app;
+mod processing;
+mod settings;
+mod step_indicator;
+mod steps;
+mod tutorial;
+pub(crate) mod utils;
+mod welcome;
+mod wizard;
+
+use gtk::prelude::*;
+
 fn main() {
-    println!("Pixstrip GTK - v{}", pixstrip_core::version());
+    let app = app::build_app();
+    app.run();
 }

pixstrip-gtk/src/processing.rs

@@ -0,0 +1,264 @@
+use adw::prelude::*;
+
+pub fn build_processing_page() -> adw::NavigationPage {
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(16)
+        .margin_top(24)
+        .margin_bottom(24)
+        .margin_start(24)
+        .margin_end(24)
+        .vexpand(true)
+        .build();
+
+    // Title
+    let title = gtk::Label::builder()
+        .label("Processing...")
+        .css_classes(["title-1"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    // Progress info
+    let progress_label = gtk::Label::builder()
+        .label("0 / 0 images")
+        .css_classes(["heading"])
+        .halign(gtk::Align::Start)
+        .build();
+    progress_label.set_widget_name("processing-count-label");
+
+    let progress_bar = gtk::ProgressBar::builder()
+        .fraction(0.0)
+        .show_text(true)
+        .text("0%")
+        .build();
+    progress_bar.update_property(&[
+        gtk::accessible::Property::Label("Processing progress"),
+    ]);
+
+    let eta_label = gtk::Label::builder()
+        .label("Estimating time remaining...")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .build();
+    eta_label.set_widget_name("processing-eta-label");
+
+    // Activity log
+    let log_group = adw::PreferencesGroup::builder()
+        .title("Activity")
+        .build();
+
+    let log_scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .min_content_height(200)
+        .build();
+
+    let log_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(2)
+        .build();
+    log_box.set_widget_name("processing-log-box");
+
+    log_scrolled.set_child(Some(&log_box));
+    log_group.add(&log_scrolled);
+
+    // Control buttons
+    let button_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(12)
+        .halign(gtk::Align::Center)
+        .margin_top(12)
+        .build();
+
+    let pause_button = gtk::Button::builder()
+        .label("Pause")
+        .tooltip_text("Pause after current image")
+        .build();
+
+    let cancel_button = gtk::Button::builder()
+        .label("Cancel")
+        .tooltip_text("Cancel processing")
+        .build();
+    cancel_button.add_css_class("destructive-action");
+
+    button_box.append(&pause_button);
+    button_box.append(&cancel_button);
+
+    content.append(&title);
+    content.append(&progress_label);
+    content.append(&progress_bar);
+    content.append(&eta_label);
+    content.append(&log_group);
+    content.append(&button_box);
+
+    adw::NavigationPage::builder()
+        .title("Processing")
+        .tag("processing")
+        .child(&content)
+        .build()
+}
+
+pub fn build_results_page() -> adw::NavigationPage {
+    let scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .build();
+
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(16)
+        .margin_top(24)
+        .margin_bottom(24)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    // Success icon and title
+    let status_icon = gtk::Image::builder()
+        .icon_name("emblem-ok-symbolic")
+        .pixel_size(48)
+        .halign(gtk::Align::Center)
+        .css_classes(["success"])
+        .build();
+    status_icon.update_property(&[
+        gtk::accessible::Property::Label("Success"),
+    ]);
+
+    let title = gtk::Label::builder()
+        .label("Processing Complete")
+        .css_classes(["title-1"])
+        .halign(gtk::Align::Center)
+        .build();
+
+    content.append(&status_icon);
+    content.append(&title);
+
+    // Stats
+    let stats_group = adw::PreferencesGroup::builder()
+        .title("Results")
+        .build();
+
+    let images_row = adw::ActionRow::builder()
+        .title("Images processed")
+        .subtitle("0 images")
+        .build();
+    let images_icon = gtk::Image::from_icon_name("image-x-generic-symbolic");
+    images_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    images_row.add_prefix(&images_icon);
+
+    let size_before_row = adw::ActionRow::builder()
+        .title("Original size")
+        .subtitle("0 B")
+        .build();
+    let size_before_icon = gtk::Image::from_icon_name("drive-harddisk-symbolic");
+    size_before_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    size_before_row.add_prefix(&size_before_icon);
+
+    let size_after_row = adw::ActionRow::builder()
+        .title("Output size")
+        .subtitle("0 B")
+        .build();
+    let size_after_icon = gtk::Image::from_icon_name("drive-harddisk-symbolic");
+    size_after_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    size_after_row.add_prefix(&size_after_icon);
+
+    let savings_row = adw::ActionRow::builder()
+        .title("Space saved")
+        .subtitle("0%")
+        .build();
+    let savings_icon = gtk::Image::from_icon_name("emblem-ok-symbolic");
+    savings_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    savings_row.add_prefix(&savings_icon);
+
+    let time_row = adw::ActionRow::builder()
+        .title("Processing time")
+        .subtitle("0s")
+        .build();
+    let time_icon = gtk::Image::from_icon_name("preferences-system-time-symbolic");
+    time_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    time_row.add_prefix(&time_icon);
+
+    stats_group.add(&images_row);
+    stats_group.add(&size_before_row);
+    stats_group.add(&size_after_row);
+    stats_group.add(&savings_row);
+    stats_group.add(&time_row);
+    content.append(&stats_group);
+
+    // Errors section (initially hidden)
+    let errors_group = adw::PreferencesGroup::builder()
+        .title("Errors")
+        .visible(false)
+        .build();
+
+    let errors_expander = adw::ExpanderRow::builder()
+        .title("0 errors occurred")
+        .build();
+    errors_group.add(&errors_expander);
+    content.append(&errors_group);
+
+    // Action buttons
+    let action_group = adw::PreferencesGroup::new();
+
+    let open_row = adw::ActionRow::builder()
+        .title("Open Output Folder")
+        .subtitle("View processed images in file manager")
+        .activatable(true)
+        .build();
+    let open_icon = gtk::Image::from_icon_name("folder-open-symbolic");
+    open_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    open_row.add_prefix(&open_icon);
+    let open_arrow = gtk::Image::from_icon_name("go-next-symbolic");
+    open_arrow.set_accessible_role(gtk::AccessibleRole::Presentation);
+    open_row.add_suffix(&open_arrow);
+
+    let process_more_row = adw::ActionRow::builder()
+        .title("Process Another Batch")
+        .subtitle("Start over with new images")
+        .activatable(true)
+        .build();
+    let more_icon = gtk::Image::from_icon_name("view-refresh-symbolic");
+    more_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    process_more_row.add_prefix(&more_icon);
+    let more_arrow = gtk::Image::from_icon_name("go-next-symbolic");
+    more_arrow.set_accessible_role(gtk::AccessibleRole::Presentation);
+    process_more_row.add_suffix(&more_arrow);
+
+    let save_preset_row = adw::ActionRow::builder()
+        .title("Save as Preset")
+        .subtitle("Save this workflow for future use")
+        .activatable(true)
+        .build();
+    let save_icon = gtk::Image::from_icon_name("document-save-symbolic");
+    save_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    save_preset_row.add_prefix(&save_icon);
+    let save_arrow = gtk::Image::from_icon_name("go-next-symbolic");
+    save_arrow.set_accessible_role(gtk::AccessibleRole::Presentation);
+    save_preset_row.add_suffix(&save_arrow);
+
+    let add_queue_row = adw::ActionRow::builder()
+        .title("Add to Queue")
+        .subtitle("Queue another batch with different images")
+        .activatable(true)
+        .build();
+    let queue_icon = gtk::Image::from_icon_name("view-list-symbolic");
+    queue_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    add_queue_row.add_prefix(&queue_icon);
+    let queue_arrow = gtk::Image::from_icon_name("go-next-symbolic");
+    queue_arrow.set_accessible_role(gtk::AccessibleRole::Presentation);
+    add_queue_row.add_suffix(&queue_arrow);
+
+    action_group.add(&open_row);
+    action_group.add(&process_more_row);
+    action_group.add(&add_queue_row);
+    action_group.add(&save_preset_row);
+    content.append(&action_group);
+
+    scrolled.set_child(Some(&content));
+
+    adw::NavigationPage::builder()
+        .title("Results")
+        .tag("results")
+        .child(&scrolled)
+        .build()
+}

pixstrip-gtk/src/settings.rs

@@ -0,0 +1,766 @@
+use adw::prelude::*;
+use std::cell::Cell;
+use pixstrip_core::config::{AppConfig, ErrorBehavior, OverwriteBehavior, SkillLevel};
+use pixstrip_core::storage::ConfigStore;
+
+pub fn build_settings_dialog() -> adw::PreferencesDialog {
+    let dialog = adw::PreferencesDialog::builder()
+        .title("Settings")
+        .build();
+
+    let config_store = ConfigStore::new();
+    let config = match config_store.load() {
+        Ok(c) => c,
+        Err(e) => {
+            eprintln!("Failed to load config, using defaults: {}", e);
+            AppConfig::default()
+        }
+    };
+
+    // General page
+    let general_page = adw::PreferencesPage::builder()
+        .title("General")
+        .icon_name("preferences-system-symbolic")
+        .build();
+
+    let output_group = adw::PreferencesGroup::builder()
+        .title("Output")
+        .build();
+
+    // Output mode: subfolder or fixed path
+    let output_mode_row = adw::ComboRow::builder()
+        .title("Default output location")
+        .subtitle("Where processed images are saved by default")
+        .use_subtitle(true)
+        .build();
+    let output_mode_model = gtk::StringList::new(&[
+        "Subfolder next to originals",
+        "Fixed output folder",
+    ]);
+    output_mode_row.set_model(Some(&output_mode_model));
+    output_mode_row.set_list_factory(Some(&crate::steps::full_text_list_factory()));
+    output_mode_row.set_selected(if config.output_fixed_path.is_some() { 1 } else { 0 });
+
+    let subfolder_row = adw::EntryRow::builder()
+        .title("Default output subfolder")
+        .text(&config.output_subfolder)
+        .visible(config.output_fixed_path.is_none())
+        .build();
+
+    let fixed_path_row = adw::ActionRow::builder()
+        .title("Fixed output folder")
+        .subtitle(
+            config.output_fixed_path
+                .as_deref()
+                .unwrap_or("No folder selected"),
+        )
+        .activatable(true)
+        .visible(config.output_fixed_path.is_some())
+        .build();
+    let fp_icon = gtk::Image::from_icon_name("folder-open-symbolic");
+    fp_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    fixed_path_row.add_prefix(&fp_icon);
+
+    let choose_fixed_btn = gtk::Button::builder()
+        .icon_name("document-open-symbolic")
+        .tooltip_text("Choose output folder")
+        .valign(gtk::Align::Center)
+        .build();
+    choose_fixed_btn.add_css_class("flat");
+    choose_fixed_btn.update_property(&[
+        gtk::accessible::Property::Label("Choose output folder"),
+    ]);
+    fixed_path_row.add_suffix(&choose_fixed_btn);
+
+    // Shared state for fixed path
+    let fixed_path_state: std::rc::Rc<std::cell::RefCell<Option<String>>> =
+        std::rc::Rc::new(std::cell::RefCell::new(config.output_fixed_path.clone()));
+
+    // Wire output mode toggle
+    {
+        let sf = subfolder_row.clone();
+        let fp = fixed_path_row.clone();
+        output_mode_row.connect_selected_notify(move |row| {
+            let is_fixed = row.selected() == 1;
+            sf.set_visible(!is_fixed);
+            fp.set_visible(is_fixed);
+        });
+    }
+
+    // Wire fixed path chooser
+    {
+        let fps = fixed_path_state.clone();
+        let fpr = fixed_path_row.clone();
+        choose_fixed_btn.connect_clicked(move |btn| {
+            let fps = fps.clone();
+            let fpr = fpr.clone();
+            let dialog = gtk::FileDialog::builder()
+                .title("Choose Output Folder")
+                .modal(true)
+                .build();
+            if let Some(window) = btn.root().and_then(|r| r.downcast::<gtk::Window>().ok()) {
+                dialog.select_folder(Some(&window), gtk::gio::Cancellable::NONE, move |result| {
+                    if let Ok(file) = result
+                        && let Some(path) = file.path()
+                    {
+                        let path_str = path.display().to_string();
+                        fpr.set_subtitle(&path_str);
+                        *fps.borrow_mut() = Some(path_str);
+                    }
+                });
+            }
+        });
+    }
+
+    let overwrite_row = adw::ComboRow::builder()
+        .title("Default overwrite behavior")
+        .subtitle("What to do when output files already exist")
+        .use_subtitle(true)
+        .build();
+    let overwrite_model = gtk::StringList::new(&[
+        "Ask before overwriting",
+        "Auto-rename with suffix",
+        "Always overwrite",
+        "Skip existing files",
+    ]);
+    overwrite_row.set_model(Some(&overwrite_model));
+    overwrite_row.set_list_factory(Some(&crate::steps::full_text_list_factory()));
+    overwrite_row.set_selected(match config.overwrite_behavior {
+        OverwriteBehavior::Ask => 0,
+        OverwriteBehavior::AutoRename => 1,
+        OverwriteBehavior::Overwrite => 2,
+        OverwriteBehavior::Skip => 3,
+    });
+
+    let remember_row = adw::SwitchRow::builder()
+        .title("Remember last-used settings")
+        .subtitle("Restore wizard state on next launch")
+        .active(config.remember_settings)
+        .build();
+
+    output_group.add(&output_mode_row);
+    output_group.add(&subfolder_row);
+    output_group.add(&fixed_path_row);
+    output_group.add(&overwrite_row);
+    output_group.add(&remember_row);
+    general_page.add(&output_group);
+
+    let ui_group = adw::PreferencesGroup::builder()
+        .title("Interface")
+        .build();
+
+    let skill_row = adw::ComboRow::builder()
+        .title("Detail level")
+        .subtitle("Controls how many options are visible by default")
+        .use_subtitle(true)
+        .build();
+    let skill_model = gtk::StringList::new(&["Simple", "Detailed"]);
+    skill_row.set_model(Some(&skill_model));
+    skill_row.set_list_factory(Some(&crate::steps::full_text_list_factory()));
+    skill_row.set_selected(match config.skill_level {
+        SkillLevel::Simple => 0,
+        SkillLevel::Detailed => 1,
+    });
+
+    let reset_button = gtk::Button::builder()
+        .label("Reset to Defaults")
+        .halign(gtk::Align::Start)
+        .margin_top(8)
+        .build();
+    reset_button.add_css_class("destructive-action");
+
+    // Reset welcome wizard / tutorial
+    let reset_welcome_state: std::rc::Rc<Cell<bool>> = std::rc::Rc::new(Cell::new(false));
+
+    let reset_welcome_row = adw::ActionRow::builder()
+        .title("Reset welcome wizard")
+        .subtitle("Show the setup wizard and tutorial again on next launch")
+        .build();
+
+    let reset_welcome_btn = gtk::Button::builder()
+        .label("Reset")
+        .valign(gtk::Align::Center)
+        .build();
+    reset_welcome_btn.add_css_class("destructive-action");
+
+    {
+        let rws = reset_welcome_state.clone();
+        let row = reset_welcome_row.clone();
+        reset_welcome_btn.connect_clicked(move |btn| {
+            rws.set(true);
+            btn.set_sensitive(false);
+            row.set_subtitle("Will show on next launch");
+        });
+    }
+
+    reset_welcome_row.add_suffix(&reset_welcome_btn);
+
+    ui_group.add(&skill_row);
+    ui_group.add(&reset_welcome_row);
+    general_page.add(&ui_group);
+
+    // File Manager Integration
+    let fm_group = adw::PreferencesGroup::builder()
+        .title("File Manager Integration")
+        .description("Add 'Process with Pixstrip' to your file manager's right-click menu")
+        .build();
+
+    use pixstrip_core::fm_integration::FileManager;
+    let file_managers = [
+        (FileManager::Nautilus, "org.gnome.Nautilus"),
+        (FileManager::Nemo, "org.nemo.Nemo"),
+        (FileManager::Thunar, "thunar"),
+        (FileManager::Dolphin, "org.kde.dolphin"),
+    ];
+
+    let mut found_fm = false;
+    for (fm, desktop_id) in &file_managers {
+        let is_installed = gtk::gio::AppInfo::all()
+            .iter()
+            .any(|info| {
+                info.id()
+                    .map(|id| id.as_str().contains(desktop_id))
+                    .unwrap_or(false)
+            });
+
+        if is_installed {
+            found_fm = true;
+            let already_installed = fm.is_installed();
+            let row = adw::SwitchRow::builder()
+                .title(fm.name())
+                .subtitle(format!("Add right-click menu to {}", fm.name()))
+                .active(already_installed)
+                .build();
+
+            let fm_copy = *fm;
+            let reverting = std::rc::Rc::new(std::cell::Cell::new(false));
+            let reverting_clone = reverting.clone();
+            row.connect_active_notify(move |row| {
+                if reverting_clone.get() {
+                    return;
+                }
+                let result = if row.is_active() {
+                    fm_copy.install()
+                } else {
+                    fm_copy.uninstall()
+                };
+                if let Err(e) = result {
+                    eprintln!("File manager integration error for {}: {}", fm_copy.name(), e);
+                    reverting_clone.set(true);
+                    row.set_active(!row.is_active());
+                    reverting_clone.set(false);
+                }
+            });
+
+            fm_group.add(&row);
+        }
+    }
+
+    if !found_fm {
+        let row = adw::ActionRow::builder()
+            .title("No supported file managers detected")
+            .subtitle("Nautilus, Nemo, Thunar, and Dolphin are supported")
+            .build();
+        row.add_prefix(&gtk::Image::from_icon_name("dialog-information-symbolic"));
+        fm_group.add(&row);
+    }
+
+    general_page.add(&fm_group);
+
+    // Reset defaults group
+    let reset_group = adw::PreferencesGroup::new();
+    reset_group.add(&reset_button);
+    general_page.add(&reset_group);
+
+    dialog.add(&general_page);
+
+    // Processing page
+    let processing_page = adw::PreferencesPage::builder()
+        .title("Processing")
+        .icon_name("system-run-symbolic")
+        .build();
+
+    let threads_group = adw::PreferencesGroup::builder()
+        .title("Performance")
+        .build();
+
+    let threads_row = adw::ComboRow::builder()
+        .title("Processing threads")
+        .subtitle("Auto uses all available CPU cores")
+        .use_subtitle(true)
+        .build();
+    let threads_model = gtk::StringList::new(&["Auto", "1", "2", "4", "8"]);
+    threads_row.set_model(Some(&threads_model));
+    threads_row.set_list_factory(Some(&crate::steps::full_text_list_factory()));
+    threads_row.set_selected(match config.thread_count {
+        pixstrip_core::config::ThreadCount::Auto => 0,
+        pixstrip_core::config::ThreadCount::Manual(1) => 1,
+        pixstrip_core::config::ThreadCount::Manual(2) => 2,
+        pixstrip_core::config::ThreadCount::Manual(n) if n <= 4 => 3,
+        pixstrip_core::config::ThreadCount::Manual(_) => 4,
+    });
+
+    let error_row = adw::ComboRow::builder()
+        .title("On error")
+        .subtitle("What to do when an image fails to process")
+        .use_subtitle(true)
+        .build();
+    let error_model = gtk::StringList::new(&["Skip and continue", "Pause on error"]);
+    error_row.set_model(Some(&error_model));
+    error_row.set_list_factory(Some(&crate::steps::full_text_list_factory()));
+    error_row.set_selected(match config.error_behavior {
+        ErrorBehavior::SkipAndContinue => 0,
+        ErrorBehavior::PauseOnError => 1,
+    });
+
+    threads_group.add(&threads_row);
+    threads_group.add(&error_row);
+    processing_page.add(&threads_group);
+    dialog.add(&processing_page);
+
+    // Accessibility page
+    let a11y_page = adw::PreferencesPage::builder()
+        .title("Accessibility")
+        .icon_name("preferences-desktop-accessibility-symbolic")
+        .build();
+
+    let a11y_group = adw::PreferencesGroup::builder()
+        .title("Visual Preferences")
+        .description("Override system settings for this app only")
+        .build();
+
+    let contrast_row = adw::SwitchRow::builder()
+        .title("High contrast")
+        .subtitle("Increase visual contrast throughout the app")
+        .active(config.high_contrast)
+        .build();
+
+    let large_text_row = adw::SwitchRow::builder()
+        .title("Large text")
+        .subtitle("Increase text size throughout the app")
+        .active(config.large_text)
+        .build();
+
+    let motion_row = adw::SwitchRow::builder()
+        .title("Reduced motion")
+        .subtitle("Minimize animations and transitions")
+        .active(config.reduced_motion)
+        .build();
+
+    // Wire high contrast to apply immediately
+    {
+        let original_theme: std::rc::Rc<std::cell::RefCell<Option<gtk::glib::GString>>> =
+            std::rc::Rc::new(std::cell::RefCell::new(
+                gtk::Settings::default().and_then(|s| s.gtk_theme_name())
+            ));
+        let orig_theme = original_theme.clone();
+        contrast_row.connect_active_notify(move |row| {
+            if let Some(settings) = gtk::Settings::default() {
+                if row.is_active() {
+                    // Capture current theme before switching (if not already captured)
+                    let mut saved = orig_theme.borrow_mut();
+                    if saved.is_none() {
+                        *saved = settings.gtk_theme_name();
+                    }
+                    settings.set_gtk_theme_name(Some("HighContrast"));
+                } else {
+                    let saved = orig_theme.borrow();
+                    settings.set_gtk_theme_name(saved.as_deref());
+                }
+            }
+        });
+    }
+
+    // Wire large text to apply immediately
+    {
+        // Capture the initial DPI at construction so we can restore it later
+        let initial_dpi = gtk::Settings::default()
+            .map(|s| s.gtk_xft_dpi())
+            .unwrap_or(0);
+        let original_dpi: std::rc::Rc<Cell<i32>> = std::rc::Rc::new(Cell::new(initial_dpi));
+        let orig_dpi = original_dpi.clone();
+        large_text_row.connect_active_notify(move |row| {
+            if let Some(settings) = gtk::Settings::default() {
+                if row.is_active() {
+                    // Store original DPI before modifying (refresh if not yet set)
+                    let current_dpi = settings.gtk_xft_dpi();
+                    if current_dpi > 0 {
+                        orig_dpi.set(current_dpi);
+                        settings.set_gtk_xft_dpi(current_dpi * 5 / 4);
+                    }
+                } else {
+                    // Restore the original DPI (only if we actually changed it)
+                    let saved = orig_dpi.get();
+                    if saved > 0 {
+                        settings.set_gtk_xft_dpi(saved);
+                    }
+                }
+            }
+        });
+    }
+
+    // Wire reduced motion to apply immediately
+    {
+        motion_row.connect_active_notify(move |row| {
+            if let Some(settings) = gtk::Settings::default() {
+                settings.set_gtk_enable_animations(!row.is_active());
+            }
+        });
+    }
+
+    a11y_group.add(&contrast_row);
+    a11y_group.add(&large_text_row);
+    a11y_group.add(&motion_row);
+    a11y_page.add(&a11y_group);
+    dialog.add(&a11y_page);
+
+    // Notifications page
+    let notify_page = adw::PreferencesPage::builder()
+        .title("Notifications")
+        .icon_name("preferences-system-notifications-symbolic")
+        .build();
+
+    let notify_group = adw::PreferencesGroup::builder()
+        .title("Completion")
+        .build();
+
+    let desktop_notify_row = adw::SwitchRow::builder()
+        .title("Desktop notification")
+        .subtitle("Show notification when processing completes")
+        .active(config.notify_on_completion)
+        .build();
+
+    let sound_row = adw::SwitchRow::builder()
+        .title("Completion sound")
+        .subtitle("Play a sound when processing completes")
+        .active(config.play_completion_sound)
+        .build();
+
+    let auto_open_row = adw::SwitchRow::builder()
+        .title("Auto-open output folder")
+        .subtitle("Open the output folder in file manager when done")
+        .active(config.auto_open_output)
+        .build();
+
+    notify_group.add(&desktop_notify_row);
+    notify_group.add(&sound_row);
+    notify_group.add(&auto_open_row);
+    notify_page.add(&notify_group);
+    dialog.add(&notify_page);
+
+    // Watch Folders page
+    let watch_page = adw::PreferencesPage::builder()
+        .title("Watch Folders")
+        .icon_name("folder-visiting-symbolic")
+        .build();
+
+    let watch_group = adw::PreferencesGroup::builder()
+        .title("Monitored Folders")
+        .description("Automatically process images added to these folders")
+        .build();
+
+    let watch_list = gtk::ListBox::builder()
+        .selection_mode(gtk::SelectionMode::None)
+        .css_classes(["boxed-list"])
+        .build();
+    watch_list.set_widget_name("watch-folder-list");
+    watch_list.update_property(&[
+        gtk::accessible::Property::Label("Configured watch folders for automatic processing"),
+    ]);
+
+    // Shared state for watch folders
+    let watch_folders_state: std::rc::Rc<std::cell::RefCell<Vec<pixstrip_core::watcher::WatchFolder>>> =
+        std::rc::Rc::new(std::cell::RefCell::new(config.watch_folders.clone()));
+
+    // Build preset names list for dropdown
+    let builtin_presets = pixstrip_core::preset::Preset::all_builtins();
+    let preset_names: Vec<String> = builtin_presets.iter().map(|p| p.name.clone()).collect();
+
+    // Populate existing watch folders
+    {
+        let folders = watch_folders_state.borrow();
+        for folder in folders.iter() {
+            let row = build_watch_folder_row(folder, &preset_names, &watch_folders_state, &watch_list);
+            watch_list.append(&row);
+        }
+    }
+
+    // Empty state
+    let empty_label = gtk::Label::builder()
+        .label("No watch folders configured.\nAdd a folder to start automatic processing.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Center)
+        .margin_top(16)
+        .margin_bottom(16)
+        .justify(gtk::Justification::Center)
+        .build();
+    empty_label.set_visible(config.watch_folders.is_empty());
+
+    watch_group.add(&watch_list);
+    watch_group.add(&empty_label);
+
+    // Add folder button
+    let add_button = gtk::Button::builder()
+        .label("Add Watch Folder")
+        .halign(gtk::Align::Start)
+        .margin_top(8)
+        .build();
+    add_button.add_css_class("suggested-action");
+    add_button.add_css_class("pill");
+
+    {
+        let wfs = watch_folders_state.clone();
+        let wl = watch_list.clone();
+        let el = empty_label.clone();
+        let pnames = preset_names.clone();
+        add_button.connect_clicked(move |btn| {
+            let wfs = wfs.clone();
+            let wl = wl.clone();
+            let el = el.clone();
+            let pnames = pnames.clone();
+            let dialog = gtk::FileDialog::builder()
+                .title("Choose Watch Folder")
+                .modal(true)
+                .build();
+
+            if let Some(window) = btn.root().and_then(|r| r.downcast::<gtk::Window>().ok()) {
+                dialog.select_folder(Some(&window), gtk::gio::Cancellable::NONE, move |result| {
+                    if let Ok(file) = result
+                        && let Some(path) = file.path()
+                    {
+                        let new_folder = pixstrip_core::watcher::WatchFolder {
+                            path: path.clone(),
+                            preset_name: "Blog Photos".to_string(),
+                            recursive: false,
+                            active: true,
+                        };
+                        let row = build_watch_folder_row(&new_folder, &pnames, &wfs, &wl);
+                        wl.append(&row);
+                        wfs.borrow_mut().push(new_folder);
+                        el.set_visible(false);
+                    }
+                });
+            }
+        });
+    }
+
+    let add_group = adw::PreferencesGroup::new();
+    add_group.add(&add_button);
+
+    watch_page.add(&watch_group);
+    watch_page.add(&add_group);
+    dialog.add(&watch_page);
+
+    // Wire reset button
+    {
+        let subfolder = subfolder_row.clone();
+        let overwrite = overwrite_row.clone();
+        let remember = remember_row.clone();
+        let skill = skill_row.clone();
+        let threads = threads_row.clone();
+        let error = error_row.clone();
+        let contrast = contrast_row.clone();
+        let large_text = large_text_row.clone();
+        let motion = motion_row.clone();
+        let notify = desktop_notify_row.clone();
+        let sound = sound_row.clone();
+        let auto_open = auto_open_row.clone();
+        let output_mode = output_mode_row.clone();
+        let fps_reset = fixed_path_state.clone();
+        let wfs_reset = watch_folders_state.clone();
+        let wl_reset = watch_list.clone();
+        let el_reset = empty_label.clone();
+        reset_button.connect_clicked(move |_| {
+            let defaults = AppConfig::default();
+            subfolder.set_text(&defaults.output_subfolder);
+            overwrite.set_selected(0);
+            remember.set_active(defaults.remember_settings);
+            skill.set_selected(0);
+            threads.set_selected(0);
+            error.set_selected(0);
+            contrast.set_active(defaults.high_contrast);
+            large_text.set_active(defaults.large_text);
+            motion.set_active(defaults.reduced_motion);
+            notify.set_active(defaults.notify_on_completion);
+            sound.set_active(defaults.play_completion_sound);
+            auto_open.set_active(defaults.auto_open_output);
+            output_mode.set_selected(0);
+            *fps_reset.borrow_mut() = None;
+            // Clear watch folders
+            wfs_reset.borrow_mut().clear();
+            wl_reset.remove_all();
+            el_reset.set_visible(true);
+        });
+    }
+
+    // Preserve history settings from current config (not exposed in UI yet)
+    let hist_max_entries = config.history_max_entries;
+    let hist_max_days = config.history_max_days;
+
+    // Save settings when the dialog closes
+    dialog.connect_closed(move |_| {
+        let welcome_reset = reset_welcome_state.get();
+        let new_config = AppConfig {
+            first_run_complete: !welcome_reset,
+            tutorial_complete: !welcome_reset,
+            output_subfolder: subfolder_row.text().to_string(),
+            output_fixed_path: if output_mode_row.selected() == 1 {
+                fixed_path_state.borrow().clone()
+            } else {
+                None
+            },
+            overwrite_behavior: match overwrite_row.selected() {
+                1 => OverwriteBehavior::AutoRename,
+                2 => OverwriteBehavior::Overwrite,
+                3 => OverwriteBehavior::Skip,
+                _ => OverwriteBehavior::Ask,
+            },
+            remember_settings: remember_row.is_active(),
+            skill_level: match skill_row.selected() {
+                1 => SkillLevel::Detailed,
+                _ => SkillLevel::Simple,
+            },
+            thread_count: match threads_row.selected() {
+                1 => pixstrip_core::config::ThreadCount::Manual(1),
+                2 => pixstrip_core::config::ThreadCount::Manual(2),
+                3 => pixstrip_core::config::ThreadCount::Manual(4),
+                4 => pixstrip_core::config::ThreadCount::Manual(8),
+                _ => pixstrip_core::config::ThreadCount::Auto,
+            },
+            error_behavior: match error_row.selected() {
+                1 => ErrorBehavior::PauseOnError,
+                _ => ErrorBehavior::SkipAndContinue,
+            },
+            notify_on_completion: desktop_notify_row.is_active(),
+            play_completion_sound: sound_row.is_active(),
+            auto_open_output: auto_open_row.is_active(),
+            high_contrast: contrast_row.is_active(),
+            large_text: large_text_row.is_active(),
+            reduced_motion: motion_row.is_active(),
+            history_max_entries: hist_max_entries,
+            history_max_days: hist_max_days,
+            watch_folders: watch_folders_state.borrow().clone(),
+        };
+
+        let store = ConfigStore::new();
+        let _ = store.save(&new_config);
+    });
+
+    dialog
+}
+
+fn build_watch_folder_row(
+    folder: &pixstrip_core::watcher::WatchFolder,
+    preset_names: &[String],
+    watch_state: &std::rc::Rc<std::cell::RefCell<Vec<pixstrip_core::watcher::WatchFolder>>>,
+    list_box: &gtk::ListBox,
+) -> adw::ExpanderRow {
+    let display_path = folder.path.file_name()
+        .and_then(|n| n.to_str())
+        .unwrap_or_else(|| folder.path.to_str().unwrap_or("Unknown"));
+
+    let row = adw::ExpanderRow::builder()
+        .title(display_path)
+        .subtitle(&folder.path.display().to_string())
+        .show_enable_switch(true)
+        .enable_expansion(folder.active)
+        .build();
+    row.add_prefix(&gtk::Image::from_icon_name("folder-visiting-symbolic"));
+
+    // Preset selector
+    let preset_row = adw::ComboRow::builder()
+        .title("Linked Preset")
+        .subtitle("Preset to apply to new images")
+        .use_subtitle(true)
+        .build();
+    let preset_model = gtk::StringList::new(
+        &preset_names.iter().map(|s| s.as_str()).collect::<Vec<_>>(),
+    );
+    preset_row.set_model(Some(&preset_model));
+    preset_row.set_list_factory(Some(&crate::steps::full_text_list_factory()));
+
+    // Set selected to matching preset
+    let selected_idx = preset_names.iter()
+        .position(|n| *n == folder.preset_name)
+        .unwrap_or(0);
+    preset_row.set_selected(selected_idx as u32);
+
+    // Recursive toggle
+    let recursive_row = adw::SwitchRow::builder()
+        .title("Include Subfolders")
+        .subtitle("Monitor subfolders recursively")
+        .active(folder.recursive)
+        .build();
+
+    // Remove button
+    let remove_row = adw::ActionRow::builder()
+        .title("Remove This Folder")
+        .build();
+    remove_row.add_prefix(&gtk::Image::from_icon_name("user-trash-symbolic"));
+    let remove_btn = gtk::Button::builder()
+        .icon_name("edit-delete-symbolic")
+        .tooltip_text("Remove watch folder")
+        .valign(gtk::Align::Center)
+        .build();
+    remove_btn.add_css_class("flat");
+    remove_btn.add_css_class("error");
+    remove_row.add_suffix(&remove_btn);
+
+    row.add_row(&preset_row);
+    row.add_row(&recursive_row);
+    row.add_row(&remove_row);
+
+    // Wire enable toggle
+    let folder_path = folder.path.clone();
+    {
+        let wfs = watch_state.clone();
+        let fp = folder_path.clone();
+        row.connect_enable_expansion_notify(move |r| {
+            let mut folders = wfs.borrow_mut();
+            if let Some(f) = folders.iter_mut().find(|f| f.path == fp) {
+                f.active = r.enables_expansion();
+            }
+        });
+    }
+
+    // Wire preset change
+    {
+        let wfs = watch_state.clone();
+        let fp = folder_path.clone();
+        let pnames = preset_names.to_vec();
+        preset_row.connect_selected_notify(move |r| {
+            let mut folders = wfs.borrow_mut();
+            if let Some(f) = folders.iter_mut().find(|f| f.path == fp) {
+                f.preset_name = pnames.get(r.selected() as usize)
+                    .cloned()
+                    .unwrap_or_default();
+            }
+        });
+    }
+
+    // Wire recursive toggle
+    {
+        let wfs = watch_state.clone();
+        let fp = folder_path.clone();
+        recursive_row.connect_active_notify(move |r| {
+            let mut folders = wfs.borrow_mut();
+            if let Some(f) = folders.iter_mut().find(|f| f.path == fp) {
+                f.recursive = r.is_active();
+            }
+        });
+    }
+
+    // Wire remove button
+    {
+        let wfs = watch_state.clone();
+        let lb = list_box.clone();
+        let fp = folder_path;
+        let r = row.clone();
+        remove_btn.connect_clicked(move |_| {
+            wfs.borrow_mut().retain(|f| f.path != fp);
+            lb.remove(&r);
+        });
+    }
+
+    row
+}

pixstrip-gtk/src/step_indicator.rs

@@ -0,0 +1,208 @@
+use gtk::prelude::*;
+use gtk::glib::prelude::ToVariant;
+use std::cell::RefCell;
+
+#[derive(Clone)]
+pub struct StepIndicator {
+    container: gtk::Box,
+    grid: gtk::Grid,
+    dots: RefCell<Vec<StepDot>>,
+    /// Maps visual index -> actual step index
+    step_map: RefCell<Vec<usize>>,
+}
+
+#[derive(Clone)]
+struct StepDot {
+    button: gtk::Button,
+    icon: gtk::Image,
+    label: gtk::Label,
+}
+
+impl StepIndicator {
+    pub fn new(step_names: &[String]) -> Self {
+        let container = gtk::Box::builder()
+            .orientation(gtk::Orientation::Horizontal)
+            .halign(gtk::Align::Center)
+            .spacing(0)
+            .margin_top(8)
+            .margin_bottom(8)
+            .margin_start(12)
+            .margin_end(12)
+            .build();
+
+        container.set_overflow(gtk::Overflow::Hidden);
+
+        container.update_property(&[
+            gtk::accessible::Property::Label("Wizard step indicator"),
+        ]);
+
+        let grid = gtk::Grid::builder()
+            .column_homogeneous(false)
+            .row_spacing(2)
+            .column_spacing(0)
+            .hexpand(false)
+            .build();
+
+        let indices: Vec<usize> = (0..step_names.len()).collect();
+        let dots = Self::build_dots(&grid, step_names, &indices);
+
+        container.append(&grid);
+
+        // First step starts as current
+        let total = dots.len();
+        if let Some(first) = dots.first() {
+            first.icon.set_icon_name(Some("radio-checked-symbolic"));
+            first.button.set_sensitive(true);
+            first.label.add_css_class("accent");
+            first.button.update_property(&[
+                gtk::accessible::Property::Label(
+                    &format!("Step 1 of {}: {} (current)", total, first.label.label())
+                ),
+            ]);
+        }
+        // Label all non-current dots
+        for (i, dot) in dots.iter().enumerate().skip(1) {
+            dot.button.update_property(&[
+                gtk::accessible::Property::Label(
+                    &format!("Step {} of {}: {}", i + 1, total, dot.label.label())
+                ),
+            ]);
+        }
+
+        Self {
+            container,
+            grid,
+            dots: RefCell::new(dots),
+            step_map: RefCell::new(indices),
+        }
+    }
+
+    fn build_dots(grid: &gtk::Grid, names: &[String], step_indices: &[usize]) -> Vec<StepDot> {
+        let mut dots = Vec::new();
+
+        for (visual_i, (name, &actual_i)) in names.iter().zip(step_indices.iter()).enumerate() {
+            let col = (visual_i * 2) as i32;
+
+            if visual_i > 0 {
+                let line = gtk::Separator::builder()
+                    .orientation(gtk::Orientation::Horizontal)
+                    .hexpand(false)
+                    .valign(gtk::Align::Center)
+                    .build();
+                line.set_size_request(12, -1);
+                grid.attach(&line, col - 1, 0, 1, 1);
+            }
+
+            let icon = gtk::Image::builder()
+                .icon_name("radio-symbolic")
+                .pixel_size(16)
+                .build();
+
+            let button = gtk::Button::builder()
+                .child(&icon)
+                .has_frame(false)
+                .tooltip_text(format!("Step {}: {} (Alt+{})", visual_i + 1, name, actual_i + 1))
+                .sensitive(false)
+                .action_name("win.goto-step")
+                .action_target(&(actual_i as i32 + 1).to_variant())
+                .halign(gtk::Align::Center)
+                .build();
+            button.add_css_class("circular");
+
+            let label = gtk::Label::builder()
+                .label(name)
+                .css_classes(["caption"])
+                .ellipsize(gtk::pango::EllipsizeMode::End)
+                .width_chars(10)
+                .halign(gtk::Align::Center)
+                .build();
+
+            grid.attach(&button, col, 0, 1, 1);
+            grid.attach(&label, col, 1, 1, 1);
+
+            dots.push(StepDot {
+                button,
+                icon,
+                label,
+            });
+        }
+
+        dots
+    }
+
+    /// Rebuild the indicator to show only the given steps.
+    /// `visible_steps` is a list of (actual_step_index, name).
+    pub fn rebuild(&self, visible_steps: &[(usize, String)]) {
+        // Clear the grid
+        while let Some(child) = self.grid.first_child() {
+            self.grid.remove(&child);
+        }
+
+        let names: Vec<String> = visible_steps.iter().map(|(_, n)| n.clone()).collect();
+        let indices: Vec<usize> = visible_steps.iter().map(|(i, _)| *i).collect();
+
+        let dots = Self::build_dots(&self.grid, &names, &indices);
+        *self.dots.borrow_mut() = dots;
+        *self.step_map.borrow_mut() = indices;
+    }
+
+    /// Set the current step by actual step index. Finds the visual position.
+    pub fn set_current(&self, actual_index: usize) {
+        let dots = self.dots.borrow();
+        let map = self.step_map.borrow();
+        let total = dots.len();
+        for (visual_i, dot) in dots.iter().enumerate() {
+            let is_current = map.get(visual_i) == Some(&actual_index);
+            if is_current {
+                dot.icon.set_icon_name(Some("radio-checked-symbolic"));
+                dot.button.set_sensitive(true);
+                dot.label.add_css_class("accent");
+                dot.button.update_property(&[
+                    gtk::accessible::Property::Label(
+                        &format!("Step {} of {}: {} (current)", visual_i + 1, total, dot.label.label())
+                    ),
+                ]);
+            } else if dot.icon.icon_name().as_deref() != Some("emblem-ok-symbolic") {
+                dot.icon.set_icon_name(Some("radio-symbolic"));
+                dot.label.remove_css_class("accent");
+                dot.button.update_property(&[
+                    gtk::accessible::Property::Label(
+                        &format!("Step {} of {}: {}", visual_i + 1, total, dot.label.label())
+                    ),
+                ]);
+            }
+        }
+    }
+
+    /// Mark a step as completed by actual step index.
+    pub fn set_completed(&self, actual_index: usize) {
+        let dots = self.dots.borrow();
+        let map = self.step_map.borrow();
+        let total = dots.len();
+        if let Some(visual_i) = map.iter().position(|&i| i == actual_index) {
+            if let Some(dot) = dots.get(visual_i) {
+                dot.icon.set_icon_name(Some("emblem-ok-symbolic"));
+                dot.button.set_sensitive(true);
+                dot.label.remove_css_class("accent");
+                dot.button.update_property(&[
+                    gtk::accessible::Property::Label(
+                        &format!("Step {} of {}: {} (completed)", visual_i + 1, total, dot.label.label())
+                    ),
+                ]);
+            }
+        }
+    }
+
+    pub fn widget(&self) -> &gtk::Box {
+        &self.container
+    }
+}
+
+// Allow appending the step indicator to containers
+impl std::ops::Deref for StepIndicator {
+    type Target = gtk::Box;
+
+    fn deref(&self) -> &Self::Target {
+        &self.container
+    }
+}

pixstrip-gtk/src/steps/mod.rs

@@ -0,0 +1,40 @@
+pub mod step_adjustments;
+pub mod step_compress;
+pub mod step_convert;
+pub mod step_images;
+pub mod step_metadata;
+pub mod step_output;
+pub mod step_rename;
+pub mod step_resize;
+pub mod step_watermark;
+pub mod step_workflow;
+
+use gtk::prelude::*;
+
+/// Creates a list factory for ComboRow dropdowns where labels never truncate.
+/// The default GTK factory ellipsizes text, which cuts off long option names.
+pub fn full_text_list_factory() -> gtk::SignalListItemFactory {
+    let factory = gtk::SignalListItemFactory::new();
+    factory.connect_setup(|_, item| {
+        let Some(item) = item.downcast_ref::<gtk::ListItem>() else { return };
+        let label = gtk::Label::builder()
+            .xalign(0.0)
+            .margin_start(8)
+            .margin_end(8)
+            .margin_top(8)
+            .margin_bottom(8)
+            .build();
+        item.set_child(Some(&label));
+    });
+    factory.connect_bind(|_, item| {
+        let Some(item) = item.downcast_ref::<gtk::ListItem>() else { return };
+        if let Some(obj) = item.item() {
+            if let Some(string_obj) = obj.downcast_ref::<gtk::StringObject>() {
+                if let Some(label) = item.child().and_downcast_ref::<gtk::Label>() {
+                    label.set_label(&string_obj.string());
+                }
+            }
+        }
+    });
+    factory
+}

pixstrip-gtk/src/steps/step_adjustments.rs

@@ -0,0 +1,747 @@
+use adw::prelude::*;
+use gtk::glib;
+use std::cell::Cell;
+use std::rc::Rc;
+
+use crate::app::AppState;
+
+pub fn build_adjustments_page(state: &AppState) -> adw::NavigationPage {
+    let cfg = state.job_config.borrow();
+
+    // === OUTER LAYOUT ===
+    let outer = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(0)
+        .vexpand(true)
+        .build();
+
+    // --- Enable toggle (full width) ---
+    let enable_group = adw::PreferencesGroup::builder()
+        .margin_start(12)
+        .margin_end(12)
+        .margin_top(12)
+        .build();
+    let enable_row = adw::SwitchRow::builder()
+        .title("Enable Adjustments")
+        .subtitle("Rotate, flip, brightness, contrast, effects")
+        .active(cfg.adjustments_enabled)
+        .tooltip_text("Toggle image adjustments on or off")
+        .build();
+    enable_group.add(&enable_row);
+    outer.append(&enable_group);
+
+    // === LEFT SIDE: Preview ===
+
+    let preview_picture = gtk::Picture::builder()
+        .content_fit(gtk::ContentFit::Contain)
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    preview_picture.set_can_target(true);
+    preview_picture.set_focusable(true);
+    preview_picture.update_property(&[
+        gtk::accessible::Property::Label("Adjustments preview - press Space to cycle images"),
+    ]);
+
+    let info_label = gtk::Label::builder()
+        .label("No images loaded")
+        .css_classes(["dim-label", "caption"])
+        .halign(gtk::Align::Center)
+        .margin_top(4)
+        .margin_bottom(4)
+        .build();
+
+    let preview_frame = gtk::Frame::builder()
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    preview_frame.set_child(Some(&preview_picture));
+
+    let preview_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(4)
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    preview_box.append(&preview_frame);
+    preview_box.append(&info_label);
+
+    // === RIGHT SIDE: Controls (scrollable) ===
+
+    let controls = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_start(12)
+        .build();
+
+    // --- Orientation group ---
+    let orient_group = adw::PreferencesGroup::builder()
+        .title("Orientation")
+        .build();
+
+    let rotate_row = adw::ComboRow::builder()
+        .title("Rotate")
+        .subtitle("Rotation applied to all images")
+        .use_subtitle(true)
+        .tooltip_text("Rotate all images by a fixed angle or auto-orient from EXIF")
+        .build();
+    rotate_row.set_model(Some(&gtk::StringList::new(&[
+        "None",
+        "90 clockwise",
+        "180",
+        "270 clockwise",
+        "Auto-orient (from EXIF)",
+    ])));
+    rotate_row.set_list_factory(Some(&super::full_text_list_factory()));
+    rotate_row.set_selected(cfg.rotation);
+
+    let flip_row = adw::ComboRow::builder()
+        .title("Flip")
+        .subtitle("Mirror the image")
+        .use_subtitle(true)
+        .tooltip_text("Mirror images horizontally or vertically")
+        .build();
+    flip_row.set_model(Some(&gtk::StringList::new(&["None", "Horizontal", "Vertical"])));
+    flip_row.set_list_factory(Some(&super::full_text_list_factory()));
+    flip_row.set_selected(cfg.flip);
+
+    orient_group.add(&rotate_row);
+    orient_group.add(&flip_row);
+    controls.append(&orient_group);
+
+    // --- Color adjustments group ---
+    let color_group = adw::PreferencesGroup::builder()
+        .title("Color")
+        .build();
+
+    // Helper to build a slider row with reset button
+    let make_slider_row = |title: &str, label_text: &str, value: i32| -> (adw::ActionRow, gtk::Scale, gtk::Button) {
+        let row = adw::ActionRow::builder()
+            .title(title)
+            .subtitle(&format!("{}", value))
+            .build();
+        let scale = gtk::Scale::with_range(gtk::Orientation::Horizontal, -100.0, 100.0, 1.0);
+        scale.set_value(value as f64);
+        scale.set_draw_value(false);
+        scale.set_hexpand(false);
+        scale.set_valign(gtk::Align::Center);
+        scale.set_width_request(180);
+        scale.set_tooltip_text(Some(label_text));
+        scale.update_property(&[
+            gtk::accessible::Property::Label(label_text),
+        ]);
+
+        let reset_btn = gtk::Button::builder()
+            .icon_name("edit-undo-symbolic")
+            .valign(gtk::Align::Center)
+            .tooltip_text("Reset to 0")
+            .has_frame(false)
+            .build();
+        reset_btn.update_property(&[
+            gtk::accessible::Property::Label(&format!("Reset {} to 0", title)),
+        ]);
+        reset_btn.set_sensitive(value != 0);
+
+        row.add_suffix(&scale);
+        row.add_suffix(&reset_btn);
+        (row, scale, reset_btn)
+    };
+
+    let (brightness_row, brightness_scale, brightness_reset) =
+        make_slider_row("Brightness", "Brightness adjustment, -100 to +100", cfg.brightness);
+    let (contrast_row, contrast_scale, contrast_reset) =
+        make_slider_row("Contrast", "Contrast adjustment, -100 to +100", cfg.contrast);
+    let (saturation_row, saturation_scale, saturation_reset) =
+        make_slider_row("Saturation", "Saturation adjustment, -100 to +100", cfg.saturation);
+
+    color_group.add(&brightness_row);
+    color_group.add(&contrast_row);
+    color_group.add(&saturation_row);
+    controls.append(&color_group);
+
+    // --- Effects group (compact toggle buttons) ---
+    let effects_group = adw::PreferencesGroup::builder()
+        .title("Effects")
+        .build();
+
+    let effects_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(8)
+        .margin_top(4)
+        .margin_bottom(4)
+        .halign(gtk::Align::Start)
+        .build();
+
+    let grayscale_btn = gtk::ToggleButton::builder()
+        .label("Grayscale")
+        .active(cfg.grayscale)
+        .tooltip_text("Convert to grayscale")
+        .build();
+    grayscale_btn.update_property(&[
+        gtk::accessible::Property::Label("Grayscale effect toggle"),
+    ]);
+
+    let sepia_btn = gtk::ToggleButton::builder()
+        .label("Sepia")
+        .active(cfg.sepia)
+        .tooltip_text("Apply sepia tone")
+        .build();
+    sepia_btn.update_property(&[
+        gtk::accessible::Property::Label("Sepia effect toggle"),
+    ]);
+
+    let sharpen_btn = gtk::ToggleButton::builder()
+        .label("Sharpen")
+        .active(cfg.sharpen)
+        .tooltip_text("Sharpen the image")
+        .build();
+    sharpen_btn.update_property(&[
+        gtk::accessible::Property::Label("Sharpen effect toggle"),
+    ]);
+
+    effects_box.append(&grayscale_btn);
+    effects_box.append(&sepia_btn);
+    effects_box.append(&sharpen_btn);
+    effects_group.add(&effects_box);
+    controls.append(&effects_group);
+
+    // --- Crop & Canvas group ---
+    let crop_group = adw::PreferencesGroup::builder()
+        .title("Crop and Canvas")
+        .build();
+
+    let crop_row = adw::ComboRow::builder()
+        .title("Crop to Aspect Ratio")
+        .subtitle("Crop from center to a specific ratio")
+        .use_subtitle(true)
+        .tooltip_text("Crop from center to a specific aspect ratio")
+        .build();
+    crop_row.set_model(Some(&gtk::StringList::new(&[
+        "None",
+        "1:1 (Square)",
+        "4:3",
+        "3:2",
+        "16:9",
+        "9:16 (Portrait)",
+        "3:4 (Portrait)",
+        "2:3 (Portrait)",
+    ])));
+    crop_row.set_list_factory(Some(&super::full_text_list_factory()));
+    crop_row.set_selected(cfg.crop_aspect_ratio);
+
+    let trim_row = adw::SwitchRow::builder()
+        .title("Trim Whitespace")
+        .subtitle("Remove uniform borders around the image")
+        .active(cfg.trim_whitespace)
+        .tooltip_text("Detect and remove uniform borders around the image")
+        .build();
+
+    let padding_row = adw::SpinRow::builder()
+        .title("Canvas Padding")
+        .subtitle("Add uniform padding (pixels)")
+        .adjustment(&gtk::Adjustment::new(cfg.canvas_padding as f64, 0.0, 500.0, 1.0, 10.0, 0.0))
+        .tooltip_text("Add a white border around each image in pixels")
+        .build();
+
+    crop_group.add(&crop_row);
+    crop_group.add(&trim_row);
+    crop_group.add(&padding_row);
+    controls.append(&crop_group);
+
+    // Scrollable controls
+    let controls_scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .width_request(360)
+        .child(&controls)
+        .build();
+
+    // === Main layout: 60/40 side-by-side ===
+    let main_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(12)
+        .margin_end(12)
+        .vexpand(true)
+        .build();
+
+    preview_box.set_width_request(400);
+    main_box.append(&preview_box);
+    main_box.append(&controls_scrolled);
+    outer.append(&main_box);
+
+    // Preview state
+    let preview_index: Rc<Cell<usize>> = Rc::new(Cell::new(0));
+
+    drop(cfg);
+
+    // === Preview update closure ===
+    let preview_gen: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let update_preview = {
+        let files = state.loaded_files.clone();
+        let jc = state.job_config.clone();
+        let pic = preview_picture.clone();
+        let info = info_label.clone();
+        let pidx = preview_index.clone();
+        let bind_gen = preview_gen.clone();
+
+        Rc::new(move || {
+            let loaded = files.borrow();
+            if loaded.is_empty() {
+                info.set_label("No images loaded");
+                pic.set_paintable(gtk::gdk::Paintable::NONE);
+                return;
+            }
+
+            let idx = pidx.get().min(loaded.len().saturating_sub(1));
+            pidx.set(idx);
+            let path = loaded[idx].clone();
+            let name = path.file_name().and_then(|n| n.to_str()).unwrap_or("image");
+            info.set_label(&format!("[{}/{}] {}", idx + 1, loaded.len(), name));
+
+            let cfg = jc.borrow();
+            let rotation = cfg.rotation;
+            let flip = cfg.flip;
+            let brightness = cfg.brightness;
+            let contrast = cfg.contrast;
+            let saturation = cfg.saturation;
+            let grayscale = cfg.grayscale;
+            let sepia = cfg.sepia;
+            let sharpen = cfg.sharpen;
+            let crop_aspect = cfg.crop_aspect_ratio;
+            let trim_ws = cfg.trim_whitespace;
+            let padding = cfg.canvas_padding;
+            drop(cfg);
+
+            let my_gen = bind_gen.get().wrapping_add(1);
+            bind_gen.set(my_gen);
+            let gen_check = bind_gen.clone();
+
+            let pic = pic.clone();
+            let (tx, rx) = std::sync::mpsc::channel::<Option<Vec<u8>>>();
+            std::thread::spawn(move || {
+                let result = (|| -> Option<Vec<u8>> {
+                    let img = image::open(&path).ok()?;
+                    let img = img.resize(1024, 1024, image::imageops::FilterType::Triangle);
+
+                    // Rotation
+                    let mut img = match rotation {
+                        1 => img.rotate90(),
+                        2 => img.rotate180(),
+                        3 => img.rotate270(),
+                        // 4 = auto-orient from EXIF - skip in preview (would need exif crate)
+                        _ => img,
+                    };
+
+                    // Flip
+                    match flip {
+                        1 => img = img.fliph(),
+                        2 => img = img.flipv(),
+                        _ => {}
+                    }
+
+                    // Crop to aspect ratio
+                    if crop_aspect > 0 {
+                        let (target_w, target_h): (f64, f64) = match crop_aspect {
+                            1 => (1.0, 1.0),   // 1:1
+                            2 => (4.0, 3.0),   // 4:3
+                            3 => (3.0, 2.0),   // 3:2
+                            4 => (16.0, 9.0),  // 16:9
+                            5 => (9.0, 16.0),  // 9:16
+                            6 => (3.0, 4.0),   // 3:4
+                            7 => (2.0, 3.0),   // 2:3
+                            _ => (1.0, 1.0),
+                        };
+                        let iw = img.width() as f64;
+                        let ih = img.height() as f64;
+                        let target_ratio = target_w / target_h;
+                        let current_ratio = iw / ih;
+                        let (crop_w, crop_h) = if current_ratio > target_ratio {
+                            ((ih * target_ratio) as u32, img.height())
+                        } else {
+                            (img.width(), (iw / target_ratio) as u32)
+                        };
+                        let cx = (img.width().saturating_sub(crop_w)) / 2;
+                        let cy = (img.height().saturating_sub(crop_h)) / 2;
+                        img = img.crop_imm(cx, cy, crop_w, crop_h);
+                    }
+
+                    // Trim whitespace (matches core algorithm with threshold)
+                    if trim_ws {
+                        let rgba = img.to_rgba8();
+                        let (w, h) = (rgba.width(), rgba.height());
+                        if w > 2 && h > 2 {
+                            let bg = *rgba.get_pixel(0, 0);
+                            let threshold = 30u32;
+                            let is_bg = |p: &image::Rgba<u8>| -> bool {
+                                let dr = (p[0] as i32 - bg[0] as i32).unsigned_abs();
+                                let dg = (p[1] as i32 - bg[1] as i32).unsigned_abs();
+                                let db = (p[2] as i32 - bg[2] as i32).unsigned_abs();
+                                dr + dg + db < threshold
+                            };
+                            let mut top = 0u32;
+                            let mut bottom = h - 1;
+                            let mut left = 0u32;
+                            let mut right = w - 1;
+                            'top: for y in 0..h {
+                                for x in 0..w {
+                                    if !is_bg(rgba.get_pixel(x, y)) { top = y; break 'top; }
+                                }
+                            }
+                            'bottom: for y in (0..h).rev() {
+                                for x in 0..w {
+                                    if !is_bg(rgba.get_pixel(x, y)) { bottom = y; break 'bottom; }
+                                }
+                            }
+                            'left: for x in 0..w {
+                                for y in top..=bottom {
+                                    if !is_bg(rgba.get_pixel(x, y)) { left = x; break 'left; }
+                                }
+                            }
+                            'right: for x in (0..w).rev() {
+                                for y in top..=bottom {
+                                    if !is_bg(rgba.get_pixel(x, y)) { right = x; break 'right; }
+                                }
+                            }
+                            let cw = right.saturating_sub(left).saturating_add(1);
+                            let ch = bottom.saturating_sub(top).saturating_add(1);
+                            if cw > 0 && ch > 0 && (cw < w || ch < h) {
+                                img = img.crop_imm(left, top, cw, ch);
+                            }
+                        }
+                    }
+
+                    // Brightness
+                    if brightness != 0 {
+                        img = img.brighten(brightness);
+                    }
+                    // Contrast
+                    if contrast != 0 {
+                        img = img.adjust_contrast(contrast as f32);
+                    }
+                    // Saturation
+                    if saturation != 0 {
+                        let sat = saturation.clamp(-100, 100);
+                        let factor = 1.0 + (sat as f64 / 100.0);
+                        let mut rgba = img.into_rgba8();
+                        for pixel in rgba.pixels_mut() {
+                            let r = pixel[0] as f64;
+                            let g = pixel[1] as f64;
+                            let b = pixel[2] as f64;
+                            let gray = 0.2126 * r + 0.7152 * g + 0.0722 * b;
+                            pixel[0] = (gray + (r - gray) * factor).clamp(0.0, 255.0) as u8;
+                            pixel[1] = (gray + (g - gray) * factor).clamp(0.0, 255.0) as u8;
+                            pixel[2] = (gray + (b - gray) * factor).clamp(0.0, 255.0) as u8;
+                        }
+                        img = image::DynamicImage::ImageRgba8(rgba);
+                    }
+                    // Sharpen
+                    if sharpen {
+                        img = img.unsharpen(1.0, 5);
+                    }
+                    // Grayscale
+                    if grayscale {
+                        img = image::DynamicImage::ImageLuma8(img.to_luma8());
+                    }
+                    // Sepia
+                    if sepia {
+                        let mut rgba = img.into_rgba8();
+                        for pixel in rgba.pixels_mut() {
+                            let r = pixel[0] as f64;
+                            let g = pixel[1] as f64;
+                            let b = pixel[2] as f64;
+                            pixel[0] = (0.393 * r + 0.769 * g + 0.189 * b).clamp(0.0, 255.0) as u8;
+                            pixel[1] = (0.349 * r + 0.686 * g + 0.168 * b).clamp(0.0, 255.0) as u8;
+                            pixel[2] = (0.272 * r + 0.534 * g + 0.131 * b).clamp(0.0, 255.0) as u8;
+                        }
+                        img = image::DynamicImage::ImageRgba8(rgba);
+                    }
+
+                    // Canvas padding
+                    if padding > 0 {
+                        let pad = padding.min(200); // cap for preview
+                        let new_w = img.width().saturating_add(pad.saturating_mul(2));
+                        let new_h = img.height().saturating_add(pad.saturating_mul(2));
+                        let mut canvas = image::RgbaImage::from_pixel(
+                            new_w, new_h,
+                            image::Rgba([255, 255, 255, 255]),
+                        );
+                        image::imageops::overlay(&mut canvas, &img.to_rgba8(), pad as i64, pad as i64);
+                        img = image::DynamicImage::ImageRgba8(canvas);
+                    }
+
+                    let mut buf = Vec::new();
+                    img.write_to(
+                        &mut std::io::Cursor::new(&mut buf),
+                        image::ImageFormat::Png,
+                    ).ok()?;
+                    Some(buf)
+                })();
+                let _ = tx.send(result);
+            });
+
+            glib::timeout_add_local(std::time::Duration::from_millis(100), move || {
+                if gen_check.get() != my_gen {
+                    return glib::ControlFlow::Break;
+                }
+                match rx.try_recv() {
+                    Ok(Some(bytes)) => {
+                        let gbytes = glib::Bytes::from(&bytes);
+                        if let Ok(texture) = gtk::gdk::Texture::from_bytes(&gbytes) {
+                            pic.set_paintable(Some(&texture));
+                        }
+                        glib::ControlFlow::Break
+                    }
+                    Ok(None) => glib::ControlFlow::Break,
+                    Err(std::sync::mpsc::TryRecvError::Empty) => glib::ControlFlow::Continue,
+                    Err(_) => glib::ControlFlow::Break,
+                }
+            });
+        })
+    };
+
+    // Click-to-cycle on preview
+    {
+        let click = gtk::GestureClick::new();
+        let pidx = preview_index.clone();
+        let files = state.loaded_files.clone();
+        let up = update_preview.clone();
+        click.connect_released(move |_, _, _, _| {
+            let loaded = files.borrow();
+            if loaded.len() > 1 {
+                let next = (pidx.get() + 1) % loaded.len();
+                pidx.set(next);
+                up();
+            }
+        });
+        preview_picture.add_controller(click);
+    }
+
+    // Keyboard support for preview cycling (Space/Enter)
+    {
+        let key = gtk::EventControllerKey::new();
+        let pidx = preview_index.clone();
+        let files = state.loaded_files.clone();
+        let up = update_preview.clone();
+        key.connect_key_pressed(move |_, keyval, _, _| {
+            if keyval == gtk::gdk::Key::space || keyval == gtk::gdk::Key::Return {
+                let loaded = files.borrow();
+                if loaded.len() > 1 {
+                    let next = (pidx.get() + 1) % loaded.len();
+                    pidx.set(next);
+                    up();
+                }
+                return glib::Propagation::Stop;
+            }
+            glib::Propagation::Proceed
+        });
+        preview_picture.add_controller(key);
+    }
+
+    // === Wire signals ===
+
+    {
+        let jc = state.job_config.clone();
+        enable_row.connect_active_notify(move |row| {
+            jc.borrow_mut().adjustments_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        rotate_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().rotation = row.selected();
+            up();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        flip_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().flip = row.selected();
+            up();
+        });
+    }
+
+    // Per-slider debounce counters (separate to avoid cross-slider cancellation)
+    let brightness_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let contrast_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let saturation_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let padding_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+
+    // Brightness
+    {
+        let jc = state.job_config.clone();
+        let row = brightness_row.clone();
+        let up = update_preview.clone();
+        let rst = brightness_reset.clone();
+        let did = brightness_debounce.clone();
+        brightness_scale.connect_value_changed(move |scale| {
+            let val = scale.value().round() as i32;
+            jc.borrow_mut().brightness = val;
+            row.set_subtitle(&format!("{}", val));
+            rst.set_sensitive(val != 0);
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id {
+                    up();
+                }
+            });
+        });
+    }
+    {
+        let scale = brightness_scale.clone();
+        brightness_reset.connect_clicked(move |_| {
+            scale.set_value(0.0);
+        });
+    }
+
+    // Contrast
+    {
+        let jc = state.job_config.clone();
+        let row = contrast_row.clone();
+        let up = update_preview.clone();
+        let rst = contrast_reset.clone();
+        let did = contrast_debounce.clone();
+        contrast_scale.connect_value_changed(move |scale| {
+            let val = scale.value().round() as i32;
+            jc.borrow_mut().contrast = val;
+            row.set_subtitle(&format!("{}", val));
+            rst.set_sensitive(val != 0);
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id {
+                    up();
+                }
+            });
+        });
+    }
+    {
+        let scale = contrast_scale.clone();
+        contrast_reset.connect_clicked(move |_| {
+            scale.set_value(0.0);
+        });
+    }
+
+    // Saturation
+    {
+        let jc = state.job_config.clone();
+        let row = saturation_row.clone();
+        let up = update_preview.clone();
+        let rst = saturation_reset.clone();
+        let did = saturation_debounce.clone();
+        saturation_scale.connect_value_changed(move |scale| {
+            let val = scale.value().round() as i32;
+            jc.borrow_mut().saturation = val;
+            row.set_subtitle(&format!("{}", val));
+            rst.set_sensitive(val != 0);
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id {
+                    up();
+                }
+            });
+        });
+    }
+    {
+        let scale = saturation_scale.clone();
+        saturation_reset.connect_clicked(move |_| {
+            scale.set_value(0.0);
+        });
+    }
+
+    // Effects toggle buttons
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        grayscale_btn.connect_toggled(move |btn| {
+            jc.borrow_mut().grayscale = btn.is_active();
+            up();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        sepia_btn.connect_toggled(move |btn| {
+            jc.borrow_mut().sepia = btn.is_active();
+            up();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        sharpen_btn.connect_toggled(move |btn| {
+            jc.borrow_mut().sharpen = btn.is_active();
+            up();
+        });
+    }
+
+    // Crop & Canvas
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        crop_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().crop_aspect_ratio = row.selected();
+            up();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        trim_row.connect_active_notify(move |row| {
+            jc.borrow_mut().trim_whitespace = row.is_active();
+            up();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        let did = padding_debounce.clone();
+        padding_row.connect_value_notify(move |row| {
+            jc.borrow_mut().canvas_padding = row.value() as u32;
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id {
+                    up();
+                }
+            });
+        });
+    }
+
+    let page = adw::NavigationPage::builder()
+        .title("Adjustments")
+        .tag("step-adjustments")
+        .child(&outer)
+        .build();
+
+    // Sync enable toggle, refresh preview and sensitivity when navigating to this page
+    {
+        let up = update_preview.clone();
+        let lf = state.loaded_files.clone();
+        let ctrl = controls.clone();
+        let jc = state.job_config.clone();
+        let er = enable_row.clone();
+        page.connect_map(move |_| {
+            let enabled = jc.borrow().adjustments_enabled;
+            er.set_active(enabled);
+            ctrl.set_sensitive(!lf.borrow().is_empty());
+            up();
+        });
+    }
+
+    page
+}

pixstrip-gtk/src/steps/step_convert.rs

@@ -0,0 +1,508 @@
+use adw::prelude::*;
+use std::cell::RefCell;
+use std::collections::HashSet;
+use std::path::PathBuf;
+use std::rc::Rc;
+
+use crate::app::AppState;
+use pixstrip_core::types::ImageFormat;
+
+/// All format labels shown in the card grid.
+/// Keep Original + 7 common formats = 8 cards.
+const CARD_FORMATS: &[(&str, &str, &str, Option<ImageFormat>)] = &[
+    ("Keep Original", "No conversion", "edit-copy-symbolic", None),
+    ("JPEG", "Universal photo format\nLossy, small files", "image-x-generic-symbolic", Some(ImageFormat::Jpeg)),
+    ("PNG", "Lossless, transparency\nGraphics, screenshots", "image-x-generic-symbolic", Some(ImageFormat::Png)),
+    ("WebP", "Modern web format\nExcellent compression", "web-browser-symbolic", Some(ImageFormat::WebP)),
+    ("AVIF", "Next-gen format\nBest compression", "emblem-favorite-symbolic", Some(ImageFormat::Avif)),
+    ("GIF", "Animations, 256 colors\nSimple graphics", "media-playback-start-symbolic", Some(ImageFormat::Gif)),
+    ("TIFF", "Archival, lossless\nVery large files", "drive-harddisk-symbolic", Some(ImageFormat::Tiff)),
+    ("BMP", "Uncompressed bitmap\nLegacy format", "image-x-generic-symbolic", Some(ImageFormat::Bmp)),
+];
+
+/// Extra formats available only in the "Other Formats" dropdown: (short name, dropdown label)
+const DROPDOWN_ONLY_FORMATS: &[(&str, &str)] = &[
+    ("ICO", "ICO - Favicon and icon format, max 256x256 pixels"),
+    ("HDR", "HDR - Radiance HDR, high dynamic range imaging"),
+    ("PNM/PPM", "PNM/PPM - Portable anymap, simple uncompressed"),
+    ("TGA", "TGA - Targa, legacy game/video format"),
+    ("HEIC/HEIF", "HEIC/HEIF - Apple's photo format, excellent compression"),
+    ("JXL (JPEG XL)", "JXL (JPEG XL) - Next-gen JPEG successor, lossless and lossy"),
+    ("QOI", "QOI - Quite OK Image, fast lossless compression"),
+    ("EXR", "EXR - OpenEXR, VFX/film industry HDR standard"),
+    ("Farbfeld", "Farbfeld - Minimal 16-bit lossless, suckless format"),
+];
+
+/// Ordered list of format labels for the per-format mapping dropdowns.
+/// Index 0 = "Same as above", 1 = "Keep Original", then common formats with descriptions.
+const MAPPING_CHOICES: &[&str] = &[
+    "Same as above - use the global output format",
+    "Keep Original - no conversion for this type",
+    "JPEG - universal photo format, lossy compression",
+    "PNG - lossless with transparency, larger files",
+    "WebP - modern web format, excellent compression",
+    "AVIF - next-gen, best compression, slower encode",
+    "GIF - 256 colors, animation support",
+    "TIFF - archival lossless, very large files",
+    "BMP - uncompressed bitmap, legacy format",
+    "ICO - favicon/icon format, max 256x256",
+    "HDR - Radiance high dynamic range",
+    "PNM/PPM - portable anymap, uncompressed",
+    "TGA - Targa, legacy game/video format",
+    "HEIC/HEIF - Apple photo format, great compression",
+    "JXL (JPEG XL) - next-gen JPEG successor",
+    "QOI - fast lossless compression",
+    "EXR - OpenEXR, VFX/film HDR standard",
+    "Farbfeld - minimal 16-bit lossless",
+];
+
+pub fn build_convert_page(state: &AppState) -> adw::NavigationPage {
+    let scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .build();
+
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    let cfg = state.job_config.borrow();
+
+    // Enable toggle
+    let enable_row = adw::SwitchRow::builder()
+        .title("Enable Format Conversion")
+        .subtitle("Convert images to a different format")
+        .active(cfg.convert_enabled)
+        .tooltip_text("Toggle format conversion on or off")
+        .build();
+
+    let enable_group = adw::PreferencesGroup::new();
+    enable_group.add(&enable_row);
+    content.append(&enable_group);
+
+    // --- Visual format cards grid ---
+    let cards_group = adw::PreferencesGroup::builder()
+        .title("Output Format")
+        .description("Choose the format all images will be converted to")
+        .build();
+
+    let flow = gtk::FlowBox::builder()
+        .selection_mode(gtk::SelectionMode::Single)
+        .max_children_per_line(4)
+        .min_children_per_line(2)
+        .row_spacing(8)
+        .column_spacing(8)
+        .homogeneous(true)
+        .margin_top(4)
+        .margin_bottom(4)
+        .build();
+
+    flow.update_property(&[
+        gtk::accessible::Property::Label("Output format selection grid"),
+    ]);
+
+    let initial_format = cfg.convert_format;
+
+    for (name, desc, icon_name, _fmt) in CARD_FORMATS {
+        let card = gtk::Box::builder()
+            .orientation(gtk::Orientation::Vertical)
+            .spacing(4)
+            .hexpand(true)
+            .vexpand(false)
+            .build();
+        card.add_css_class("card");
+        card.set_size_request(130, 110);
+        card.update_property(&[
+            gtk::accessible::Property::Label(&format!("{}: {}", name, desc.replace('\n', ", "))),
+        ]);
+
+        let inner = gtk::Box::builder()
+            .orientation(gtk::Orientation::Vertical)
+            .spacing(4)
+            .margin_top(6)
+            .margin_bottom(6)
+            .margin_start(4)
+            .margin_end(4)
+            .halign(gtk::Align::Center)
+            .valign(gtk::Align::Center)
+            .vexpand(true)
+            .build();
+
+        let icon = gtk::Image::builder()
+            .icon_name(*icon_name)
+            .pixel_size(28)
+            .build();
+        icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+
+        let name_label = gtk::Label::builder()
+            .label(*name)
+            .css_classes(["heading"])
+            .build();
+
+        let desc_label = gtk::Label::builder()
+            .label(*desc)
+            .css_classes(["caption", "dim-label"])
+            .wrap(true)
+            .justify(gtk::Justification::Center)
+            .max_width_chars(18)
+            .build();
+
+        inner.append(&icon);
+        inner.append(&name_label);
+        inner.append(&desc_label);
+        card.append(&inner);
+        flow.append(&card);
+    }
+
+    // Select the initial card (only if format matches a card)
+    let initial_idx = card_index_for_format(initial_format);
+    if let Some(idx) = initial_idx
+        && let Some(child) = flow.child_at_index(idx)
+    {
+        flow.select_child(&child);
+    }
+
+    // Wrap FlowBox in a Clamp so cards don't stretch too wide when maximized
+    let clamp = adw::Clamp::builder()
+        .maximum_size(800)
+        .child(&flow)
+        .build();
+
+    // Format info label (updates based on selection)
+    let info_label = gtk::Label::builder()
+        .label(format_info(cfg.convert_format))
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .wrap(true)
+        .margin_top(8)
+        .margin_bottom(4)
+        .margin_start(4)
+        .build();
+
+    cards_group.add(&clamp);
+    cards_group.add(&info_label);
+
+    // --- "Other Formats" dropdown for less common formats ---
+    let other_group = adw::PreferencesGroup::builder()
+        .title("Other Formats")
+        .description("Less common formats not shown in the card grid")
+        .build();
+
+    let other_combo = adw::ComboRow::builder()
+        .title("Select format")
+        .subtitle("Choosing a format here deselects the card grid")
+        .use_subtitle(true)
+        .build();
+
+    // Build model: first entry is "(none)" for no selection, then extra formats with descriptions
+    let mut other_items: Vec<&str> = vec!["(none)"];
+    for (_short, label) in DROPDOWN_ONLY_FORMATS {
+        other_items.push(label);
+    }
+    other_combo.set_model(Some(&gtk::StringList::new(&other_items)));
+    other_combo.set_list_factory(Some(&super::full_text_list_factory()));
+    other_combo.set_selected(0);
+
+    other_group.add(&other_combo);
+    content.append(&cards_group);
+    content.append(&other_group);
+
+    // --- JPEG encoding options (only visible when JPEG or Keep Original is selected) ---
+    let jpeg_group = adw::PreferencesGroup::builder()
+        .title("JPEG Encoding")
+        .build();
+
+    let progressive_row = adw::SwitchRow::builder()
+        .title("Progressive JPEG")
+        .subtitle("Loads gradually in browsers, slightly larger file size")
+        .active(cfg.progressive_jpeg)
+        .tooltip_text("Creates JPEG files that load gradually in web browsers")
+        .build();
+
+    jpeg_group.add(&progressive_row);
+
+    // Show only for JPEG (card index 1) or Keep Original (card index 0)
+    let shows_jpeg = matches!(initial_format, None | Some(ImageFormat::Jpeg));
+    jpeg_group.set_visible(shows_jpeg);
+
+    content.append(&jpeg_group);
+
+    // --- Format mapping group (dynamic, rebuilt on page map) ---
+    let mapping_group = adw::PreferencesGroup::builder()
+        .title("Format Mapping")
+        .description("Override the output format for specific input types")
+        .build();
+
+    // Container for dynamically added mapping rows
+    let mapping_list = gtk::ListBox::builder()
+        .selection_mode(gtk::SelectionMode::None)
+        .css_classes(["boxed-list"])
+        .build();
+
+    mapping_group.add(&mapping_list);
+    content.append(&mapping_group);
+
+    drop(cfg);
+
+    // --- Wire signals ---
+
+    // Enable toggle
+    {
+        let jc = state.job_config.clone();
+        enable_row.connect_active_notify(move |row| {
+            jc.borrow_mut().convert_enabled = row.is_active();
+        });
+    }
+
+    // Card grid selection
+    {
+        let jc = state.job_config.clone();
+        let label = info_label.clone();
+        let combo = other_combo.clone();
+        let jg = jpeg_group.clone();
+        flow.connect_child_activated(move |_flow, child| {
+            let idx = child.index() as usize;
+            let mut c = jc.borrow_mut();
+            c.convert_format = format_for_card_index(idx);
+            label.set_label(&format_info(c.convert_format));
+            // Deselect the "Other Formats" dropdown when a card is picked
+            combo.set_selected(0);
+            // Progressive JPEG only relevant for JPEG or Keep Original
+            jg.set_visible(idx == 0 || idx == 1);
+        });
+    }
+
+    // "Other Formats" dropdown selection
+    {
+        let jc = state.job_config.clone();
+        let label = info_label;
+        let fl = flow.clone();
+        let jg = jpeg_group.clone();
+        other_combo.connect_selected_notify(move |row| {
+            let selected = row.selected();
+            if selected == 0 {
+                // "(none)" selected - do nothing, cards take priority
+                return;
+            }
+            // Deselect all cards
+            fl.unselect_all();
+            // Hide progressive JPEG - none of the "other" formats are JPEG
+            jg.set_visible(false);
+            // These formats are not in the ImageFormat enum,
+            // so set convert_format to None and show a note
+            let mut c = jc.borrow_mut();
+            c.convert_format = None;
+            let name = DROPDOWN_ONLY_FORMATS
+                .get((selected - 1) as usize)
+                .map(|(short, _)| *short)
+                .unwrap_or("Unknown");
+            label.set_label(&format!(
+                "{}: This format is not yet supported by the processing engine. \
+                 Support is planned for a future release.",
+                name
+            ));
+        });
+    }
+
+    // Progressive JPEG toggle
+    {
+        let jc = state.job_config.clone();
+        progressive_row.connect_active_notify(move |row| {
+            jc.borrow_mut().progressive_jpeg = row.is_active();
+        });
+    }
+
+    scrolled.set_child(Some(&content));
+
+    let page = adw::NavigationPage::builder()
+        .title("Convert")
+        .tag("step-convert")
+        .child(&scrolled)
+        .build();
+
+    // Sync enable toggle and rebuild format mapping rows when navigating to this page
+    {
+        let files = state.loaded_files.clone();
+        let list = mapping_list;
+        let jc = state.job_config.clone();
+        let er = enable_row.clone();
+        page.connect_map(move |_| {
+            let enabled = jc.borrow().convert_enabled;
+            er.set_active(enabled);
+            rebuild_format_mapping(&list, &files.borrow(), &jc);
+        });
+    }
+
+    page
+}
+
+/// Returns the card grid index for a given ImageFormat, or None if not in the card grid.
+fn card_index_for_format(format: Option<ImageFormat>) -> Option<i32> {
+    match format {
+        None => Some(0),
+        Some(ImageFormat::Jpeg) => Some(1),
+        Some(ImageFormat::Png) => Some(2),
+        Some(ImageFormat::WebP) => Some(3),
+        Some(ImageFormat::Avif) => Some(4),
+        Some(ImageFormat::Gif) => Some(5),
+        Some(ImageFormat::Tiff) => Some(6),
+        Some(ImageFormat::Bmp) => Some(7),
+    }
+}
+
+/// Returns the ImageFormat for a given card grid index.
+fn format_for_card_index(idx: usize) -> Option<ImageFormat> {
+    match idx {
+        1 => Some(ImageFormat::Jpeg),
+        2 => Some(ImageFormat::Png),
+        3 => Some(ImageFormat::WebP),
+        4 => Some(ImageFormat::Avif),
+        5 => Some(ImageFormat::Gif),
+        6 => Some(ImageFormat::Tiff),
+        7 => Some(ImageFormat::Bmp),
+        _ => None, // 0 = Keep Original
+    }
+}
+
+fn format_info(format: Option<ImageFormat>) -> String {
+    match format {
+        None => "Images will keep their original format. No conversion applied.".into(),
+        Some(ImageFormat::Jpeg) => "JPEG: Best for photographs. Lossy compression, \
+            no transparency support. Universally compatible with all devices and browsers."
+            .into(),
+        Some(ImageFormat::Png) => "PNG: Best for graphics, screenshots, and logos. \
+            Lossless compression, supports full transparency. Produces larger files \
+            than JPEG or WebP."
+            .into(),
+        Some(ImageFormat::WebP) => "WebP: Modern format with excellent lossy and lossless \
+            compression. Supports transparency and animation. Widely supported in modern browsers."
+            .into(),
+        Some(ImageFormat::Avif) => "AVIF: Next-generation format based on AV1 video codec. \
+            Best compression ratios available. Supports transparency and HDR. Slower to encode, \
+            growing browser support."
+            .into(),
+        Some(ImageFormat::Gif) => "GIF: Limited to 256 colors per frame. Supports basic \
+            animation and binary transparency. Best for simple graphics and short animations."
+            .into(),
+        Some(ImageFormat::Tiff) => "TIFF: Professional archival format. Lossless compression, \
+            supports layers and rich metadata. Very large files. Not suitable for web."
+            .into(),
+        Some(ImageFormat::Bmp) => "BMP: Uncompressed bitmap format. Very large files, no \
+            compression. Legacy format mainly used for compatibility with older software."
+            .into(),
+    }
+}
+
+/// Rebuild the per-format mapping rows based on which file types are actually loaded.
+/// Uses a dedicated ListBox container that can be easily cleared and rebuilt.
+fn rebuild_format_mapping(
+    list: &gtk::ListBox,
+    loaded_files: &[PathBuf],
+    job_config: &Rc<RefCell<crate::app::JobConfig>>,
+) {
+    // Clear all existing rows from the list
+    list.remove_all();
+
+    // Detect which file extensions are present in loaded files
+    let mut seen_extensions: HashSet<String> = HashSet::new();
+    for path in loaded_files {
+        if let Some(ext) = path.extension()
+            && let Some(ext_str) = ext.to_str()
+        {
+            seen_extensions.insert(ext_str.to_lowercase());
+        }
+    }
+
+    if seen_extensions.is_empty() {
+        // No files loaded yet - add a placeholder row
+        let placeholder = adw::ActionRow::builder()
+            .title("No files loaded")
+            .subtitle("Load images first to configure per-format mappings")
+            .build();
+        placeholder.add_prefix(&gtk::Image::from_icon_name("dialog-information-symbolic"));
+        list.append(&placeholder);
+        return;
+    }
+
+    // Normalize extensions to canonical display names, maintaining a stable order
+    let mut format_entries: Vec<(String, String)> = Vec::new(); // (canonical ext, display name)
+    let ext_to_name: &[(&[&str], &str)] = &[
+        (&["jpg", "jpeg"], "JPEG"),
+        (&["png"], "PNG"),
+        (&["webp"], "WebP"),
+        (&["avif"], "AVIF"),
+        (&["gif"], "GIF"),
+        (&["tiff", "tif"], "TIFF"),
+        (&["bmp"], "BMP"),
+        (&["ico"], "ICO"),
+        (&["hdr"], "HDR"),
+        (&["pnm", "ppm", "pgm", "pbm"], "PNM/PPM"),
+        (&["tga"], "TGA"),
+        (&["heic", "heif"], "HEIC/HEIF"),
+        (&["jxl"], "JXL (JPEG XL)"),
+        (&["qoi"], "QOI"),
+        (&["exr"], "EXR"),
+        (&["ff", "farbfeld"], "Farbfeld"),
+    ];
+
+    let mut added_names: HashSet<String> = HashSet::new();
+    for (exts, display_name) in ext_to_name {
+        for ext in *exts {
+            if seen_extensions.contains(*ext) && added_names.insert(display_name.to_string()) {
+                // Use the first extension as canonical key
+                format_entries.push((exts[0].to_string(), display_name.to_string()));
+                break;
+            }
+        }
+    }
+
+    // Also handle any unknown extensions in sorted order
+    let mut unknown: Vec<String> = Vec::new();
+    for ext in &seen_extensions {
+        let known = ext_to_name
+            .iter()
+            .any(|(exts, _)| exts.contains(&ext.as_str()));
+        if !known {
+            unknown.push(ext.clone());
+        }
+    }
+    unknown.sort();
+    for ext in unknown {
+        let upper = ext.to_uppercase();
+        if added_names.insert(upper.clone()) {
+            format_entries.push((ext, upper));
+        }
+    }
+
+    let cfg = job_config.borrow();
+
+    for (canonical_ext, display_name) in &format_entries {
+        let combo = adw::ComboRow::builder()
+            .title(format!("{} inputs", display_name))
+            .subtitle(format!("Output format for {} source files", display_name))
+            .use_subtitle(true)
+            .build();
+        combo.set_model(Some(&gtk::StringList::new(MAPPING_CHOICES)));
+        combo.set_list_factory(Some(&super::full_text_list_factory()));
+
+        // Restore saved selection if any
+        let saved = cfg.format_mappings.get(canonical_ext).copied().unwrap_or(0);
+        combo.set_selected(saved);
+
+        // Wire signal to save selection
+        let jc = job_config.clone();
+        let ext_key = canonical_ext.clone();
+        combo.connect_selected_notify(move |row| {
+            jc.borrow_mut()
+                .format_mappings
+                .insert(ext_key.clone(), row.selected());
+        });
+
+        list.append(&combo);
+    }
+}

pixstrip-gtk/src/steps/step_metadata.rs

@@ -0,0 +1,296 @@
+use adw::prelude::*;
+use crate::app::{AppState, MetadataMode};
+
+pub fn build_metadata_page(state: &AppState) -> adw::NavigationPage {
+    let scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .build();
+
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    let cfg = state.job_config.borrow();
+
+    // Enable toggle
+    let enable_row = adw::SwitchRow::builder()
+        .title("Enable Metadata Handling")
+        .subtitle("Control what image metadata to keep or remove")
+        .active(cfg.metadata_enabled)
+        .tooltip_text("Toggle metadata handling on or off")
+        .build();
+
+    let enable_group = adw::PreferencesGroup::new();
+    enable_group.add(&enable_row);
+    content.append(&enable_group);
+
+    // Quick presets
+    let presets_group = adw::PreferencesGroup::builder()
+        .title("Metadata Mode")
+        .build();
+
+    let strip_all_row = adw::ActionRow::builder()
+        .title("Strip All")
+        .subtitle("Remove all metadata - smallest files, maximum privacy")
+        .activatable(true)
+        .build();
+    let strip_all_icon = gtk::Image::from_icon_name("user-trash-symbolic");
+    strip_all_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    strip_all_row.add_prefix(&strip_all_icon);
+    let strip_all_check = gtk::CheckButton::new();
+    strip_all_check.set_active(cfg.metadata_mode == MetadataMode::StripAll);
+    strip_all_row.add_suffix(&strip_all_check);
+    strip_all_row.set_activatable_widget(Some(&strip_all_check));
+
+    let privacy_row = adw::ActionRow::builder()
+        .title("Privacy Mode")
+        .subtitle("Strip GPS and camera serial, keep copyright")
+        .activatable(true)
+        .build();
+    let privacy_icon = gtk::Image::from_icon_name("security-medium-symbolic");
+    privacy_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    privacy_row.add_prefix(&privacy_icon);
+    let privacy_check = gtk::CheckButton::new();
+    privacy_check.set_group(Some(&strip_all_check));
+    privacy_check.set_active(cfg.metadata_mode == MetadataMode::Privacy);
+    privacy_row.add_suffix(&privacy_check);
+    privacy_row.set_activatable_widget(Some(&privacy_check));
+
+    let keep_all_row = adw::ActionRow::builder()
+        .title("Keep All")
+        .subtitle("Preserve all original metadata")
+        .activatable(true)
+        .build();
+    let keep_all_icon = gtk::Image::from_icon_name("emblem-ok-symbolic");
+    keep_all_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    keep_all_row.add_prefix(&keep_all_icon);
+    let keep_all_check = gtk::CheckButton::new();
+    keep_all_check.set_group(Some(&strip_all_check));
+    keep_all_check.set_active(cfg.metadata_mode == MetadataMode::KeepAll);
+    keep_all_row.add_suffix(&keep_all_check);
+    keep_all_row.set_activatable_widget(Some(&keep_all_check));
+
+    let photographer_row = adw::ActionRow::builder()
+        .title("Photographer")
+        .subtitle("Keep copyright and camera model, strip GPS and software")
+        .activatable(true)
+        .build();
+    let photographer_icon = gtk::Image::from_icon_name("camera-photo-symbolic");
+    photographer_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    photographer_row.add_prefix(&photographer_icon);
+    let photographer_check = gtk::CheckButton::new();
+    photographer_check.set_group(Some(&strip_all_check));
+    photographer_row.add_suffix(&photographer_check);
+    photographer_row.set_activatable_widget(Some(&photographer_check));
+
+    let custom_row = adw::ActionRow::builder()
+        .title("Custom")
+        .subtitle("Choose exactly which metadata categories to strip")
+        .activatable(true)
+        .build();
+    let custom_icon = gtk::Image::from_icon_name("emblem-system-symbolic");
+    custom_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    custom_row.add_prefix(&custom_icon);
+    let custom_check = gtk::CheckButton::new();
+    custom_check.set_group(Some(&strip_all_check));
+    custom_check.set_active(cfg.metadata_mode == MetadataMode::Custom);
+    custom_row.add_suffix(&custom_check);
+    custom_row.set_activatable_widget(Some(&custom_check));
+
+    presets_group.add(&strip_all_row);
+    presets_group.add(&privacy_row);
+    presets_group.add(&photographer_row);
+    presets_group.add(&keep_all_row);
+    presets_group.add(&custom_row);
+    content.append(&presets_group);
+
+    // Custom category checkboxes
+    let custom_group = adw::PreferencesGroup::builder()
+        .title("Custom Categories")
+        .description("Select which metadata categories to strip")
+        .build();
+
+    let gps_row = adw::SwitchRow::builder()
+        .title("GPS / Location")
+        .subtitle("GPS coordinates, location name, altitude")
+        .active(cfg.strip_gps)
+        .tooltip_text("Strip GPS coordinates, location name, and altitude")
+        .build();
+
+    let camera_row = adw::SwitchRow::builder()
+        .title("Camera Info")
+        .subtitle("Camera model, serial number, lens data")
+        .active(cfg.strip_camera)
+        .tooltip_text("Strip camera model, serial number, and lens data")
+        .build();
+
+    let software_row = adw::SwitchRow::builder()
+        .title("Software")
+        .subtitle("Editing software, processing history")
+        .active(cfg.strip_software)
+        .tooltip_text("Strip editing software and processing history")
+        .build();
+
+    let timestamps_row = adw::SwitchRow::builder()
+        .title("Timestamps")
+        .subtitle("Date taken, date modified, date digitized")
+        .active(cfg.strip_timestamps)
+        .tooltip_text("Strip date taken, date modified, date digitized")
+        .build();
+
+    let copyright_row = adw::SwitchRow::builder()
+        .title("Copyright / Author")
+        .subtitle("Copyright notice, artist name, credits")
+        .active(cfg.strip_copyright)
+        .tooltip_text("Strip copyright notice, artist name, and credits")
+        .build();
+
+    custom_group.add(&gps_row);
+    custom_group.add(&camera_row);
+    custom_group.add(&software_row);
+    custom_group.add(&timestamps_row);
+    custom_group.add(&copyright_row);
+
+    // Only show custom group when Custom mode is selected
+    custom_group.set_visible(cfg.metadata_mode == MetadataMode::Custom);
+
+    content.append(&custom_group);
+
+    drop(cfg);
+
+    // Wire signals
+    {
+        let jc = state.job_config.clone();
+        enable_row.connect_active_notify(move |row| {
+            jc.borrow_mut().metadata_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let cg = custom_group.clone();
+        strip_all_check.connect_toggled(move |check| {
+            if check.is_active() {
+                jc.borrow_mut().metadata_mode = MetadataMode::StripAll;
+                cg.set_visible(false);
+            }
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let cg = custom_group.clone();
+        privacy_check.connect_toggled(move |check| {
+            if check.is_active() {
+                jc.borrow_mut().metadata_mode = MetadataMode::Privacy;
+                cg.set_visible(false);
+            }
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let cg = custom_group.clone();
+        let gps_c = gps_row.clone();
+        let camera_c = camera_row.clone();
+        let software_c = software_row.clone();
+        let timestamps_c = timestamps_row.clone();
+        let copyright_c = copyright_row.clone();
+        photographer_check.connect_toggled(move |check| {
+            if check.is_active() {
+                {
+                    let mut cfg = jc.borrow_mut();
+                    cfg.metadata_mode = MetadataMode::Custom;
+                    // Photographer: keep copyright + camera model, strip GPS + software
+                    cfg.strip_gps = true;
+                    cfg.strip_camera = false;
+                    cfg.strip_software = true;
+                    cfg.strip_timestamps = false;
+                    cfg.strip_copyright = false;
+                }
+                // Update UI to match (after dropping borrow to avoid re-entrancy)
+                gps_c.set_active(true);
+                camera_c.set_active(false);
+                software_c.set_active(true);
+                timestamps_c.set_active(false);
+                copyright_c.set_active(false);
+                cg.set_visible(false);
+            }
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let cg = custom_group.clone();
+        keep_all_check.connect_toggled(move |check| {
+            if check.is_active() {
+                jc.borrow_mut().metadata_mode = MetadataMode::KeepAll;
+                cg.set_visible(false);
+            }
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        let cg = custom_group;
+        custom_check.connect_toggled(move |check| {
+            if check.is_active() {
+                jc.borrow_mut().metadata_mode = MetadataMode::Custom;
+                cg.set_visible(true);
+            }
+        });
+    }
+
+    // Wire custom category toggles
+    {
+        let jc = state.job_config.clone();
+        gps_row.connect_active_notify(move |row| {
+            jc.borrow_mut().strip_gps = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        camera_row.connect_active_notify(move |row| {
+            jc.borrow_mut().strip_camera = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        software_row.connect_active_notify(move |row| {
+            jc.borrow_mut().strip_software = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        timestamps_row.connect_active_notify(move |row| {
+            jc.borrow_mut().strip_timestamps = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        copyright_row.connect_active_notify(move |row| {
+            jc.borrow_mut().strip_copyright = row.is_active();
+        });
+    }
+
+    scrolled.set_child(Some(&content));
+
+    let page = adw::NavigationPage::builder()
+        .title("Metadata")
+        .tag("step-metadata")
+        .child(&scrolled)
+        .build();
+
+    // Sync enable toggle when navigating to this page
+    {
+        let jc = state.job_config.clone();
+        let er = enable_row.clone();
+        page.connect_map(move |_| {
+            let enabled = jc.borrow().metadata_enabled;
+            er.set_active(enabled);
+        });
+    }
+
+    page
+}

pixstrip-gtk/src/steps/step_output.rs

@@ -0,0 +1,256 @@
+use adw::prelude::*;
+use crate::app::AppState;
+use crate::utils::format_size;
+
+pub fn build_output_page(state: &AppState) -> adw::NavigationPage {
+    let scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .build();
+
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    // Operation summary - dynamically rebuilt when this step is shown
+    let summary_group = adw::PreferencesGroup::builder()
+        .title("Operation Summary")
+        .description("Review your processing settings before starting")
+        .build();
+
+    let summary_box = gtk::ListBox::builder()
+        .selection_mode(gtk::SelectionMode::None)
+        .css_classes(["boxed-list"])
+        .build();
+    summary_box.set_widget_name("ops-summary-list");
+
+    summary_group.add(&summary_box);
+    content.append(&summary_group);
+
+    // Output directory
+    let output_group = adw::PreferencesGroup::builder()
+        .title("Output Directory")
+        .build();
+
+    let default_output = state.output_dir.borrow()
+        .as_ref()
+        .map(|p| p.display().to_string())
+        .unwrap_or_else(|| "processed/ (subfolder next to originals)".to_string());
+
+    let output_row = adw::ActionRow::builder()
+        .title("Output Location")
+        .subtitle(&default_output)
+        .activatable(true)
+        .action_name("win.choose-output")
+        .build();
+    output_row.add_prefix(&gtk::Image::from_icon_name("folder-symbolic"));
+
+    let choose_button = gtk::Button::builder()
+        .icon_name("folder-open-symbolic")
+        .tooltip_text("Choose output folder")
+        .valign(gtk::Align::Center)
+        .action_name("win.choose-output")
+        .build();
+    choose_button.add_css_class("flat");
+    output_row.add_suffix(&choose_button);
+    output_row.add_suffix(&gtk::Image::from_icon_name("go-next-symbolic"));
+
+    let cfg = state.job_config.borrow();
+
+    let structure_row = adw::SwitchRow::builder()
+        .title("Preserve Directory Structure")
+        .subtitle("Keep subfolder hierarchy in output")
+        .active(cfg.preserve_dir_structure)
+        .build();
+
+    output_group.add(&output_row);
+    output_group.add(&structure_row);
+    content.append(&output_group);
+
+    // Overwrite behavior
+    let overwrite_group = adw::PreferencesGroup::builder()
+        .title("If Files Already Exist")
+        .build();
+
+    let overwrite_row = adw::ComboRow::builder()
+        .title("Overwrite Behavior")
+        .subtitle("What to do when output file already exists")
+        .use_subtitle(true)
+        .build();
+    let overwrite_model = gtk::StringList::new(&[
+        "Ask before overwriting",
+        "Auto-rename with suffix",
+        "Always overwrite",
+        "Skip existing files",
+    ]);
+    overwrite_row.set_model(Some(&overwrite_model));
+    overwrite_row.set_list_factory(Some(&super::full_text_list_factory()));
+    overwrite_row.set_selected(cfg.overwrite_behavior as u32);
+
+    overwrite_group.add(&overwrite_row);
+    content.append(&overwrite_group);
+
+    // Image count - dynamically updated
+    let stats_group = adw::PreferencesGroup::builder()
+        .title("Batch Info")
+        .build();
+
+    let excluded = state.excluded_files.borrow();
+    let files = state.loaded_files.borrow();
+    let included_count = files.iter().filter(|p| !excluded.contains(*p)).count();
+    let total_size: u64 = files.iter()
+        .filter(|p| !excluded.contains(*p))
+        .filter_map(|p| std::fs::metadata(p).ok())
+        .map(|m| m.len())
+        .sum();
+    drop(files);
+    drop(excluded);
+
+    let count_row = adw::ActionRow::builder()
+        .title("Images to process")
+        .subtitle(format!("{} images ({})", included_count, format_size(total_size)))
+        .build();
+    count_row.add_prefix(&gtk::Image::from_icon_name("image-x-generic-symbolic"));
+
+    stats_group.add(&count_row);
+    content.append(&stats_group);
+
+    drop(cfg);
+
+    // Wire preserve directory structure
+    {
+        let jc = state.job_config.clone();
+        structure_row.connect_active_notify(move |row| {
+            jc.borrow_mut().preserve_dir_structure = row.is_active();
+        });
+    }
+
+    // Wire overwrite behavior
+    {
+        let jc = state.job_config.clone();
+        overwrite_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().overwrite_behavior = row.selected() as u8;
+        });
+    }
+
+    scrolled.set_child(Some(&content));
+
+    let page = adw::NavigationPage::builder()
+        .title("Output & Process")
+        .tag("step-output")
+        .child(&scrolled)
+        .build();
+
+    // Refresh stats and summary when navigating to this page
+    {
+        let lf = state.loaded_files.clone();
+        let ef = state.excluded_files.clone();
+        let jc = state.job_config.clone();
+        let od = state.output_dir.clone();
+        let cr = count_row.clone();
+        let or = output_row.clone();
+        let sb = summary_box.clone();
+        page.connect_map(move |_| {
+            // Update image count and size
+            let files = lf.borrow();
+            let excluded = ef.borrow();
+            let included_count = files.iter().filter(|p| !excluded.contains(*p)).count();
+            let total_size: u64 = files.iter()
+                .filter(|p| !excluded.contains(*p))
+                .filter_map(|p| std::fs::metadata(p).ok())
+                .map(|m| m.len())
+                .sum();
+            cr.set_subtitle(&format!("{} images ({})", included_count, format_size(total_size)));
+            drop(files);
+            drop(excluded);
+
+            // Update output directory display
+            let dir_text = od.borrow()
+                .as_ref()
+                .map(|p| p.display().to_string())
+                .unwrap_or_else(|| "processed/ (subfolder next to originals)".to_string());
+            or.set_subtitle(&dir_text);
+
+            // Build operation summary
+            while let Some(child) = sb.first_child() {
+                sb.remove(&child);
+            }
+
+            let cfg = jc.borrow();
+            let mut ops: Vec<(&str, String)> = Vec::new();
+
+            if cfg.resize_enabled {
+                let mode = match cfg.resize_mode {
+                    0 => format!("{}x{} (exact)", cfg.resize_width, cfg.resize_height),
+                    _ => format!("fit {}x{}", cfg.resize_width, cfg.resize_height),
+                };
+                ops.push(("Resize", mode));
+            }
+            if cfg.adjustments_enabled {
+                let mut parts = Vec::new();
+                if cfg.rotation > 0 { parts.push("rotate"); }
+                if cfg.flip > 0 { parts.push("flip"); }
+                if cfg.brightness != 0 { parts.push("brightness"); }
+                if cfg.contrast != 0 { parts.push("contrast"); }
+                if cfg.saturation != 0 { parts.push("saturation"); }
+                if cfg.grayscale { parts.push("grayscale"); }
+                if cfg.sepia { parts.push("sepia"); }
+                if cfg.sharpen { parts.push("sharpen"); }
+                if cfg.crop_aspect_ratio > 0 { parts.push("crop"); }
+                if cfg.trim_whitespace { parts.push("trim"); }
+                if cfg.canvas_padding > 0 { parts.push("padding"); }
+                let desc = if parts.is_empty() { "enabled".into() } else { parts.join(", ") };
+                ops.push(("Adjustments", desc));
+            }
+            if cfg.convert_enabled {
+                let fmt = cfg.convert_format.map(|f| f.extension().to_uppercase())
+                    .unwrap_or_else(|| "per-format mapping".into());
+                ops.push(("Convert", fmt));
+            }
+            if cfg.compress_enabled {
+                ops.push(("Compress", cfg.quality_preset.label().into()));
+            }
+            if cfg.metadata_enabled {
+                let mode = match &cfg.metadata_mode {
+                    crate::app::MetadataMode::StripAll => "strip all",
+                    crate::app::MetadataMode::KeepAll => "keep all",
+                    crate::app::MetadataMode::Privacy => "privacy mode",
+                    crate::app::MetadataMode::Custom => "custom",
+                };
+                ops.push(("Metadata", mode.into()));
+            }
+            if cfg.watermark_enabled {
+                let wm_type = if cfg.watermark_use_image { "image" } else { "text" };
+                ops.push(("Watermark", wm_type.into()));
+            }
+            if cfg.rename_enabled {
+                ops.push(("Rename", "enabled".into()));
+            }
+
+            if ops.is_empty() {
+                let row = adw::ActionRow::builder()
+                    .title("No operations enabled")
+                    .subtitle("Go back and enable at least one operation")
+                    .build();
+                row.add_prefix(&gtk::Image::from_icon_name("dialog-warning-symbolic"));
+                sb.append(&row);
+            } else {
+                for (name, desc) in &ops {
+                    let row = adw::ActionRow::builder()
+                        .title(*name)
+                        .subtitle(desc.as_str())
+                        .build();
+                    row.add_prefix(&gtk::Image::from_icon_name("emblem-ok-symbolic"));
+                    sb.append(&row);
+                }
+            }
+        });
+    }
+
+    page
+}

pixstrip-gtk/src/steps/step_rename.rs

@@ -0,0 +1,901 @@
+use adw::prelude::*;
+use std::cell::Cell;
+use std::collections::HashMap;
+use std::rc::Rc;
+
+use crate::app::AppState;
+
+pub fn build_rename_page(state: &AppState) -> adw::NavigationPage {
+    let cfg = state.job_config.borrow();
+
+    // === OUTER LAYOUT ===
+    let outer = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(0)
+        .vexpand(true)
+        .build();
+
+    // --- Enable toggle (full width) ---
+    let enable_group = adw::PreferencesGroup::builder()
+        .margin_start(12)
+        .margin_end(12)
+        .margin_top(12)
+        .build();
+    let enable_row = adw::SwitchRow::builder()
+        .title("Enable Rename")
+        .subtitle("Rename output files with prefix, suffix, or template")
+        .active(cfg.rename_enabled)
+        .tooltip_text("Toggle file renaming on or off")
+        .build();
+    enable_group.add(&enable_row);
+    outer.append(&enable_group);
+
+    // === LEFT SIDE: Preview ===
+
+    let show_all: Rc<Cell<bool>> = Rc::new(Cell::new(false));
+
+    let preview_header = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(8)
+        .margin_bottom(4)
+        .build();
+
+    let showing_label = gtk::Label::builder()
+        .css_classes(["dim-label", "caption"])
+        .halign(gtk::Align::Start)
+        .hexpand(true)
+        .build();
+
+    let show_all_button = gtk::Button::builder()
+        .label("Show all")
+        .build();
+    show_all_button.add_css_class("pill");
+    show_all_button.add_css_class("caption");
+
+    preview_header.append(&showing_label);
+    preview_header.append(&show_all_button);
+
+    // Preview rows container
+    let preview_rows = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(2)
+        .build();
+
+    let preview_scroll = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .child(&preview_rows)
+        .build();
+
+    // Conflict banner
+    let conflict_banner = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(8)
+        .margin_top(8)
+        .visible(false)
+        .build();
+    conflict_banner.add_css_class("card");
+    conflict_banner.set_accessible_role(gtk::AccessibleRole::Alert);
+
+    let conflict_icon = gtk::Image::builder()
+        .icon_name("dialog-warning-symbolic")
+        .margin_start(8)
+        .margin_top(4)
+        .margin_bottom(4)
+        .build();
+    conflict_icon.add_css_class("warning");
+
+    let conflict_label = gtk::Label::builder()
+        .css_classes(["caption"])
+        .halign(gtk::Align::Start)
+        .hexpand(true)
+        .wrap(true)
+        .margin_top(4)
+        .margin_bottom(4)
+        .margin_end(8)
+        .build();
+
+    conflict_banner.append(&conflict_icon);
+    conflict_banner.append(&conflict_label);
+
+    // Stats label
+    let stats_label = gtk::Label::builder()
+        .css_classes(["dim-label", "caption"])
+        .halign(gtk::Align::Start)
+        .wrap(true)
+        .margin_top(4)
+        .build();
+
+    let preview_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(4)
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    preview_box.append(&preview_header);
+    preview_box.append(&preview_scroll);
+    preview_box.append(&conflict_banner);
+    preview_box.append(&stats_label);
+
+    // === RIGHT SIDE: Controls (scrollable) ===
+
+    let controls = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_start(12)
+        .build();
+
+    // Reset button at end of controls (added later)
+    let reset_button = gtk::Button::builder()
+        .label("Reset to defaults")
+        .halign(gtk::Align::Start)
+        .margin_top(4)
+        .tooltip_text("Reset all rename options to their defaults")
+        .build();
+    reset_button.add_css_class("pill");
+
+    // --- Simple Rename group ---
+    let simple_group = adw::PreferencesGroup::builder()
+        .title("Simple Rename")
+        .description("Add prefix, suffix, and text transformations")
+        .build();
+
+    let prefix_row = adw::EntryRow::builder()
+        .title("Prefix")
+        .text(&cfg.rename_prefix)
+        .tooltip_text("Text added before the original filename")
+        .build();
+
+    let suffix_row = adw::EntryRow::builder()
+        .title("Suffix")
+        .text(&cfg.rename_suffix)
+        .tooltip_text("Text added after the original filename")
+        .build();
+
+    let replace_spaces_row = adw::ComboRow::builder()
+        .title("Replace Spaces")
+        .subtitle("How to handle spaces in filenames")
+        .use_subtitle(true)
+        .build();
+    replace_spaces_row.set_model(Some(&gtk::StringList::new(&[
+        "No change",
+        "Underscores (_)",
+        "Hyphens (-)",
+        "Dots (.)",
+        "CamelCase",
+        "Remove spaces",
+    ])));
+    replace_spaces_row.set_list_factory(Some(&super::full_text_list_factory()));
+    replace_spaces_row.set_selected(cfg.rename_replace_spaces);
+
+    let special_chars_row = adw::ComboRow::builder()
+        .title("Special Characters")
+        .subtitle("Filter non-standard characters from filenames")
+        .use_subtitle(true)
+        .build();
+    special_chars_row.set_model(Some(&gtk::StringList::new(&[
+        "Keep all",
+        "Filesystem-safe (remove / \\ : * ? \" < > |)",
+        "Web-safe (a-z, 0-9, -, _, .)",
+        "Hyphens + underscores (a-z, 0-9, -, _)",
+        "Hyphens only (a-z, 0-9, -)",
+        "Alphanumeric only (a-z, 0-9)",
+    ])));
+    special_chars_row.set_list_factory(Some(&super::full_text_list_factory()));
+    special_chars_row.set_selected(cfg.rename_special_chars);
+
+    let case_row = adw::ComboRow::builder()
+        .title("Case Conversion")
+        .subtitle("Convert filename case")
+        .use_subtitle(true)
+        .build();
+    case_row.set_model(Some(&gtk::StringList::new(&["No change", "lowercase", "UPPERCASE", "Title Case"])));
+    case_row.set_list_factory(Some(&super::full_text_list_factory()));
+    case_row.set_selected(cfg.rename_case);
+
+    // Counter toggle + expandable sub-options
+    let counter_row = adw::ExpanderRow::builder()
+        .title("Add Sequential Counter")
+        .subtitle("Append a numbered sequence to filenames")
+        .show_enable_switch(true)
+        .enable_expansion(cfg.rename_counter_enabled)
+        .expanded(cfg.rename_counter_enabled)
+        .build();
+
+    let counter_position_row = adw::ComboRow::builder()
+        .title("Counter Position")
+        .subtitle("Where the counter number appears")
+        .use_subtitle(true)
+        .build();
+    counter_position_row.set_model(Some(&gtk::StringList::new(&[
+        "Before prefix",
+        "Before name",
+        "After name",
+        "After suffix",
+        "Replace name",
+    ])));
+    counter_position_row.set_list_factory(Some(&super::full_text_list_factory()));
+    counter_position_row.set_selected(cfg.rename_counter_position);
+
+    let counter_start_row = adw::SpinRow::builder()
+        .title("Counter Start")
+        .subtitle("First number in sequence")
+        .adjustment(&gtk::Adjustment::new(cfg.rename_counter_start as f64, 0.0, 99999.0, 1.0, 10.0, 0.0))
+        .build();
+
+    let counter_padding_row = adw::SpinRow::builder()
+        .title("Counter Padding")
+        .subtitle("Minimum digits (e.g., 3 = 001, 002, 003)")
+        .adjustment(&gtk::Adjustment::new(cfg.rename_counter_padding as f64, 1.0, 10.0, 1.0, 1.0, 0.0))
+        .build();
+
+    counter_row.add_row(&counter_position_row);
+    counter_row.add_row(&counter_start_row);
+    counter_row.add_row(&counter_padding_row);
+
+    simple_group.add(&prefix_row);
+    simple_group.add(&suffix_row);
+    simple_group.add(&replace_spaces_row);
+    simple_group.add(&special_chars_row);
+    simple_group.add(&case_row);
+    simple_group.add(&counter_row);
+    controls.append(&simple_group);
+
+    // --- Advanced group ---
+    let advanced_group = adw::PreferencesGroup::builder()
+        .title("Advanced")
+        .build();
+
+    let advanced_expander = adw::ExpanderRow::builder()
+        .title("Template Engine and Find/Replace")
+        .subtitle("Advanced rename options with variables and regex")
+        .show_enable_switch(false)
+        .expanded(state.is_section_expanded("rename-advanced"))
+        .build();
+
+    {
+        let st = state.clone();
+        advanced_expander.connect_expanded_notify(move |row| {
+            st.set_section_expanded("rename-advanced", row.is_expanded());
+        });
+    }
+
+    let template_row = adw::EntryRow::builder()
+        .title("Template")
+        .text(&cfg.rename_template)
+        .tooltip_text("Use variables like {name}, {date}, {counter:3} to build filenames")
+        .build();
+
+    // Template preset chips
+    let preset_templates = [
+        ("Date + Name", "{date}_{name}"),
+        ("EXIF Date + Name", "{exif_date}_{name}"),
+        ("Sequential", "{name}_{counter:4}"),
+        ("Dimensions", "{name}_{width}x{height}"),
+        ("Camera + Date", "{camera}_{exif_date}_{counter:3}"),
+        ("Web-safe", "{name}_web"),
+        ("Date + Counter", "{date}_{counter:4}"),
+        ("Name + Size", "{name}_{width}x{height}_{counter:3}"),
+    ];
+
+    let presets_box = gtk::FlowBox::builder()
+        .selection_mode(gtk::SelectionMode::None)
+        .max_children_per_line(6)
+        .min_children_per_line(2)
+        .row_spacing(4)
+        .column_spacing(4)
+        .margin_top(4)
+        .margin_bottom(4)
+        .margin_start(12)
+        .margin_end(12)
+        .homogeneous(false)
+        .build();
+
+    for (label, template) in &preset_templates {
+        let btn = gtk::Button::builder()
+            .label(*label)
+            .tooltip_text(*template)
+            .build();
+        btn.add_css_class("flat");
+
+        let tr = template_row.clone();
+        let tmpl = template.to_string();
+        btn.connect_clicked(move |_| {
+            tr.set_text(&tmpl);
+            tr.set_position(tmpl.chars().count() as i32);
+        });
+        presets_box.append(&btn);
+    }
+
+    let presets_list_row = gtk::ListBoxRow::builder()
+        .activatable(false)
+        .selectable(false)
+        .child(&presets_box)
+        .build();
+
+    // Variable chips (collapsible)
+    let variables_expander = adw::ExpanderRow::builder()
+        .title("Available Variables")
+        .subtitle("Click to insert at cursor position in template")
+        .show_enable_switch(false)
+        .expanded(state.is_section_expanded("rename-variables"))
+        .build();
+
+    {
+        let st = state.clone();
+        variables_expander.connect_expanded_notify(move |row| {
+            st.set_section_expanded("rename-variables", row.is_expanded());
+        });
+    }
+
+    let variables = [
+        ("{name}", "Original filename (no extension)"),
+        ("{ext}", "Output file extension"),
+        ("{original_ext}", "Original file extension"),
+        ("{counter}", "Sequential counter number"),
+        ("{counter:3}", "Counter, zero-padded to 3 digits"),
+        ("{counter:4}", "Counter, zero-padded to 4 digits"),
+        ("{date}", "Today's date (YYYY-MM-DD)"),
+        ("{exif_date}", "Date photo was taken (from EXIF)"),
+        ("{camera}", "Camera model (from EXIF)"),
+        ("{width}", "Output image width in pixels"),
+        ("{height}", "Output image height in pixels"),
+    ];
+
+    let vars_flow = gtk::FlowBox::builder()
+        .selection_mode(gtk::SelectionMode::None)
+        .max_children_per_line(3)
+        .min_children_per_line(1)
+        .row_spacing(4)
+        .column_spacing(4)
+        .margin_top(4)
+        .margin_bottom(4)
+        .margin_start(12)
+        .margin_end(12)
+        .homogeneous(false)
+        .build();
+
+    for (var_name, description) in &variables {
+        let chip_box = gtk::Box::builder()
+            .orientation(gtk::Orientation::Vertical)
+            .spacing(1)
+            .build();
+
+        let name_label = gtk::Label::builder()
+            .label(*var_name)
+            .css_classes(["monospace", "caption"])
+            .halign(gtk::Align::Start)
+            .build();
+
+        let desc_label = gtk::Label::builder()
+            .label(*description)
+            .css_classes(["dim-label"])
+            .halign(gtk::Align::Start)
+            .build();
+        desc_label.add_css_class("caption");
+
+        chip_box.append(&name_label);
+        chip_box.append(&desc_label);
+
+        let btn = gtk::Button::builder()
+            .child(&chip_box)
+            .has_frame(false)
+            .build();
+        btn.update_property(&[
+            gtk::accessible::Property::Label(
+                &format!("Insert {} - {}", var_name, description)
+            ),
+        ]);
+
+        let tr = template_row.clone();
+        let var_text = var_name.to_string();
+        btn.connect_clicked(move |_| {
+            let current = tr.text().to_string();
+            if current.is_empty() {
+                tr.set_text(&var_text);
+                tr.set_position(var_text.chars().count() as i32);
+            } else {
+                let char_count = current.chars().count();
+                let pos = (tr.position().max(0) as usize).min(char_count);
+                let byte_pos = current.char_indices()
+                    .nth(pos)
+                    .map(|(i, _)| i)
+                    .unwrap_or(current.len());
+                let mut new_text = current.clone();
+                new_text.insert_str(byte_pos, &var_text);
+                tr.set_text(&new_text);
+                tr.set_position((pos.saturating_add(var_text.chars().count())) as i32);
+            }
+        });
+
+        vars_flow.append(&btn);
+    }
+
+    let vars_list_row = gtk::ListBoxRow::builder()
+        .activatable(false)
+        .selectable(false)
+        .child(&vars_flow)
+        .build();
+    variables_expander.add_row(&vars_list_row);
+
+    // Find/replace
+    let find_row = adw::EntryRow::builder()
+        .title("Find (regex)")
+        .text(&cfg.rename_find)
+        .tooltip_text("Regular expression pattern to match in filenames")
+        .build();
+
+    let replace_row = adw::EntryRow::builder()
+        .title("Replace with")
+        .text(&cfg.rename_replace)
+        .tooltip_text("Replacement text for matched pattern")
+        .build();
+
+    advanced_expander.add_row(&template_row);
+    advanced_expander.add_row(&presets_list_row);
+    advanced_expander.add_row(&find_row);
+    advanced_expander.add_row(&replace_row);
+
+    advanced_group.add(&advanced_expander);
+    advanced_group.add(&variables_expander);
+    controls.append(&advanced_group);
+    controls.append(&reset_button);
+
+    // Scrollable controls
+    let controls_scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .width_request(420)
+        .child(&controls)
+        .build();
+
+    // === Main layout: 60/40 side-by-side ===
+    let main_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(12)
+        .margin_end(12)
+        .vexpand(true)
+        .build();
+
+    preview_box.set_width_request(400);
+    main_box.append(&preview_box);
+    main_box.append(&controls_scrolled);
+    outer.append(&main_box);
+
+    drop(cfg);
+
+    // === Preview update closure ===
+    let update_preview = {
+        let files = state.loaded_files.clone();
+        let jc = state.job_config.clone();
+        let rows_box = preview_rows.clone();
+        let showing = showing_label.clone();
+        let show_all_state = show_all.clone();
+        let conflict_banner_c = conflict_banner.clone();
+        let conflict_label_c = conflict_label.clone();
+        let stats = stats_label.clone();
+        let show_btn = show_all_button.clone();
+
+        Rc::new(move || {
+            let loaded = files.borrow();
+            let cfg = jc.borrow();
+            let total = loaded.len();
+
+            // Clear existing rows
+            while let Some(child) = rows_box.first_child() {
+                rows_box.remove(&child);
+            }
+
+            if total == 0 {
+                showing.set_label("No images loaded");
+                stats.set_label("");
+                conflict_banner_c.set_visible(false);
+                show_btn.set_visible(false);
+                return;
+            }
+
+            let display_count = if show_all_state.get() { total } else { total.min(5) };
+            show_btn.set_visible(total > 5);
+            if show_all_state.get() {
+                show_btn.set_label("Show less");
+                showing.set_label(&format!("All {} files", total));
+            } else {
+                show_btn.set_label("Show all");
+                showing.set_label(&format!("Showing {} of {} files", display_count, total));
+            }
+
+            // Compute all renames for conflict detection
+            let mut all_results: Vec<String> = Vec::with_capacity(total);
+            let mut ext_counts: HashMap<String, usize> = HashMap::new();
+            let mut longest_name = 0usize;
+
+            // Pre-compile regex once for the entire batch (avoids recompiling per file)
+            let rename_cfg = pixstrip_core::operations::RenameConfig {
+                prefix: cfg.rename_prefix.clone(),
+                suffix: cfg.rename_suffix.clone(),
+                counter_start: cfg.rename_counter_start,
+                counter_padding: cfg.rename_counter_padding,
+                counter_enabled: cfg.rename_counter_enabled,
+                counter_position: cfg.rename_counter_position,
+                template: None,
+                case_mode: cfg.rename_case,
+                replace_spaces: cfg.rename_replace_spaces,
+                special_chars: cfg.rename_special_chars,
+                regex_find: cfg.rename_find.clone(),
+                regex_replace: cfg.rename_replace.clone(),
+            };
+            let compiled_re = rename_cfg.compile_regex();
+
+            for (i, path) in loaded.iter().enumerate() {
+                let name = path.file_stem().and_then(|s| s.to_str()).unwrap_or("file");
+                let ext = path.extension().and_then(|e| e.to_str()).unwrap_or("jpg");
+
+                *ext_counts.entry(ext.to_string()).or_insert(0) += 1;
+
+                let result = if !cfg.rename_template.is_empty() {
+                    let counter = cfg.rename_counter_start + i as u32;
+                    pixstrip_core::operations::rename::apply_template(
+                        &cfg.rename_template, name, ext, counter, None,
+                    )
+                } else {
+                    rename_cfg.apply_simple_compiled(name, ext, (i + 1) as u32, compiled_re.as_ref())
+                };
+
+                if result.len() > longest_name {
+                    longest_name = result.len();
+                }
+                all_results.push(result);
+            }
+
+            // Detect conflicts
+            let mut name_counts: HashMap<&str, usize> = HashMap::new();
+            for result in &all_results {
+                *name_counts.entry(result.as_str()).or_insert(0) += 1;
+            }
+            let conflicts: usize = name_counts.values().filter(|&&c| c > 1).map(|c| c).sum();
+
+            if conflicts > 0 {
+                conflict_banner_c.set_visible(true);
+                let dupes: Vec<&str> = name_counts.iter()
+                    .filter(|(_, c)| **c > 1)
+                    .take(3)
+                    .map(|(n, _)| *n)
+                    .collect();
+                let dupe_list = dupes.join(", ");
+                let msg = if name_counts.values().filter(|c| **c > 1).count() > 3 {
+                    format!("{} files have duplicate names (e.g. {}, ...)", conflicts, dupe_list)
+                } else {
+                    format!("{} files have duplicate names: {}", conflicts, dupe_list)
+                };
+                conflict_label_c.set_label(&msg);
+            } else {
+                conflict_banner_c.set_visible(false);
+            }
+
+            // Build preview rows (vertical: original on top, new name below)
+            for (i, path) in loaded.iter().take(display_count).enumerate() {
+                let name = path.file_stem().and_then(|s| s.to_str()).unwrap_or("file");
+                let ext = path.extension().and_then(|e| e.to_str()).unwrap_or("jpg");
+
+                let new_full = &all_results[i];
+
+                let row = gtk::Box::builder()
+                    .orientation(gtk::Orientation::Vertical)
+                    .spacing(1)
+                    .margin_top(3)
+                    .margin_bottom(3)
+                    .build();
+
+                let orig_label = gtk::Label::builder()
+                    .label(&format!("{}.{}", name, ext))
+                    .css_classes(["monospace", "caption", "dim-label"])
+                    .halign(gtk::Align::Start)
+                    .ellipsize(gtk::pango::EllipsizeMode::Middle)
+                    .max_width_chars(50)
+                    .build();
+
+                let new_line = gtk::Box::builder()
+                    .orientation(gtk::Orientation::Horizontal)
+                    .spacing(4)
+                    .build();
+
+                let arrow_label = gtk::Label::builder()
+                    .label("->")
+                    .css_classes(["dim-label", "caption"])
+                    .build();
+
+                let new_name_label = gtk::Label::builder()
+                    .label(new_full.as_str())
+                    .css_classes(["monospace", "caption"])
+                    .halign(gtk::Align::Start)
+                    .hexpand(true)
+                    .ellipsize(gtk::pango::EllipsizeMode::Middle)
+                    .max_width_chars(50)
+                    .build();
+
+                // Highlight conflicts with both color AND icon indicator
+                let is_conflict = name_counts.get(new_full.as_str()).copied().unwrap_or(0) > 1;
+                if is_conflict {
+                    new_name_label.add_css_class("error");
+                    let conflict_icon = gtk::Image::builder()
+                        .icon_name("dialog-warning-symbolic")
+                        .pixel_size(12)
+                        .tooltip_text("Duplicate filename")
+                        .build();
+                    conflict_icon.add_css_class("warning");
+                    new_line.append(&conflict_icon);
+                }
+
+                new_line.append(&arrow_label);
+                new_line.append(&new_name_label);
+
+                row.append(&orig_label);
+                row.append(&new_line);
+                rows_box.append(&row);
+            }
+
+            // Stats
+            let mut ext_parts: Vec<String> = ext_counts
+                .iter()
+                .map(|(e, c)| format!("{} .{}", c, e))
+                .collect();
+            ext_parts.sort();
+
+            stats.set_label(&format!(
+                "{} files | {} conflicts | {} | Longest: {} chars",
+                total,
+                conflicts,
+                ext_parts.join(", "),
+                longest_name,
+            ));
+        })
+    };
+
+    // Debounced wrapper for text entry handlers (150ms)
+    let debounce_source: Rc<Cell<Option<gtk::glib::SourceId>>> = Rc::new(Cell::new(None));
+    let debounced_preview = {
+        let up = update_preview.clone();
+        let ds = debounce_source.clone();
+        Rc::new(move || {
+            if let Some(id) = ds.take() {
+                id.remove();
+            }
+            let up2 = up.clone();
+            let ds2 = ds.clone();
+            let id = gtk::glib::timeout_add_local_once(
+                std::time::Duration::from_millis(150),
+                move || {
+                    ds2.set(None);
+                    up2();
+                },
+            );
+            ds.set(Some(id));
+        })
+    };
+
+    // Call once for initial state
+    update_preview();
+
+    // === Wire signals ===
+
+    // Enable toggle
+    {
+        let jc = state.job_config.clone();
+        enable_row.connect_active_notify(move |row| {
+            jc.borrow_mut().rename_enabled = row.is_active();
+        });
+    }
+
+    // Show all toggle
+    {
+        let sa = show_all.clone();
+        let up = update_preview.clone();
+        show_all_button.connect_clicked(move |_| {
+            sa.set(!sa.get());
+            up();
+        });
+    }
+
+    // Reset button
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        let prefix_r = prefix_row.clone();
+        let suffix_r = suffix_row.clone();
+        let spaces_r = replace_spaces_row.clone();
+        let special_r = special_chars_row.clone();
+        let case_r = case_row.clone();
+        let counter_r = counter_row.clone();
+        let counter_pos_r = counter_position_row.clone();
+        let counter_start_r = counter_start_row.clone();
+        let counter_pad_r = counter_padding_row.clone();
+        let template_r = template_row.clone();
+        let find_r = find_row.clone();
+        let replace_r = replace_row.clone();
+
+        reset_button.connect_clicked(move |_| {
+            {
+                let mut cfg = jc.borrow_mut();
+                cfg.rename_prefix = String::new();
+                cfg.rename_suffix = String::new();
+                cfg.rename_counter_enabled = false;
+                cfg.rename_counter_start = 1;
+                cfg.rename_counter_padding = 3;
+                cfg.rename_counter_position = 3;
+                cfg.rename_replace_spaces = 0;
+                cfg.rename_special_chars = 0;
+                cfg.rename_case = 0;
+                cfg.rename_template = String::new();
+                cfg.rename_find = String::new();
+                cfg.rename_replace = String::new();
+            }
+            prefix_r.set_text("");
+            suffix_r.set_text("");
+            spaces_r.set_selected(0);
+            special_r.set_selected(0);
+            case_r.set_selected(0);
+            counter_r.set_enable_expansion(false);
+            counter_r.set_expanded(false);
+            counter_pos_r.set_selected(3);
+            counter_start_r.set_value(1.0);
+            counter_pad_r.set_value(3.0);
+            template_r.set_text("");
+            find_r.set_text("");
+            replace_r.set_text("");
+            up();
+        });
+    }
+
+    // Prefix
+    {
+        let jc = state.job_config.clone();
+        let up = debounced_preview.clone();
+        prefix_row.connect_changed(move |row| {
+            jc.borrow_mut().rename_prefix = row.text().to_string();
+            up();
+        });
+    }
+
+    // Suffix
+    {
+        let jc = state.job_config.clone();
+        let up = debounced_preview.clone();
+        suffix_row.connect_changed(move |row| {
+            jc.borrow_mut().rename_suffix = row.text().to_string();
+            up();
+        });
+    }
+
+    // Replace spaces
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        replace_spaces_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().rename_replace_spaces = row.selected();
+            up();
+        });
+    }
+
+    // Special chars
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        special_chars_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().rename_special_chars = row.selected();
+            up();
+        });
+    }
+
+    // Case conversion
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        case_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().rename_case = row.selected();
+            up();
+        });
+    }
+
+    // Counter enable
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        counter_row.connect_enable_expansion_notify(move |row| {
+            jc.borrow_mut().rename_counter_enabled = row.enables_expansion();
+            up();
+        });
+    }
+
+    // Counter position
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        counter_position_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().rename_counter_position = row.selected();
+            up();
+        });
+    }
+
+    // Counter start
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        counter_start_row.connect_value_notify(move |row| {
+            jc.borrow_mut().rename_counter_start = row.value() as u32;
+            up();
+        });
+    }
+
+    // Counter padding
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        counter_padding_row.connect_value_notify(move |row| {
+            jc.borrow_mut().rename_counter_padding = row.value() as u32;
+            up();
+        });
+    }
+
+    // Template
+    {
+        let jc = state.job_config.clone();
+        let up = debounced_preview.clone();
+        template_row.connect_changed(move |row| {
+            jc.borrow_mut().rename_template = row.text().to_string();
+            up();
+        });
+    }
+
+    // Find regex
+    {
+        let jc = state.job_config.clone();
+        let up = debounced_preview.clone();
+        find_row.connect_changed(move |row| {
+            let text = row.text().to_string();
+            if !text.is_empty() {
+                if regex::Regex::new(&text).is_err() {
+                    row.add_css_class("error");
+                } else {
+                    row.remove_css_class("error");
+                }
+            } else {
+                row.remove_css_class("error");
+            }
+            jc.borrow_mut().rename_find = text;
+            up();
+        });
+    }
+
+    // Replace
+    {
+        let jc = state.job_config.clone();
+        let up = debounced_preview.clone();
+        replace_row.connect_changed(move |row| {
+            jc.borrow_mut().rename_replace = row.text().to_string();
+            up();
+        });
+    }
+
+    let page = adw::NavigationPage::builder()
+        .title("Rename")
+        .tag("step-rename")
+        .child(&outer)
+        .build();
+
+    // Sync enable toggle and refresh preview when navigating to this page
+    {
+        let up = update_preview.clone();
+        let jc = state.job_config.clone();
+        let er = enable_row.clone();
+        page.connect_map(move |_| {
+            let enabled = jc.borrow().rename_enabled;
+            er.set_active(enabled);
+            up();
+        });
+    }
+
+    page
+}

pixstrip-gtk/src/steps/step_resize.rs

@@ -0,0 +1,949 @@
+use adw::prelude::*;
+use gtk::glib;
+use std::cell::Cell;
+use std::rc::Rc;
+use crate::app::AppState;
+
+fn get_first_image_aspect(files: &[std::path::PathBuf]) -> f64 {
+    let Some(first) = files.first() else { return 0.0 };
+    let Ok((w, h)) = image::image_dimensions(first) else { return 0.0 };
+    if h == 0 { return 0.0; }
+    w as f64 / h as f64
+}
+
+fn get_image_dims(path: &std::path::Path) -> (u32, u32) {
+    image::image_dimensions(path).unwrap_or((4000, 3000))
+}
+
+fn get_first_image_dims(files: &[std::path::PathBuf]) -> (u32, u32) {
+    let Some(first) = files.first() else { return (4000, 3000) };
+    get_image_dims(first)
+}
+
+fn algo_index_to_filter(idx: u32) -> image::imageops::FilterType {
+    match idx {
+        1 => image::imageops::FilterType::CatmullRom,
+        2 => image::imageops::FilterType::Triangle,
+        3 => image::imageops::FilterType::Nearest,
+        _ => image::imageops::FilterType::Lanczos3,
+    }
+}
+
+const CATEGORIES: &[&str] = &[
+    "Fediverse / Open Platforms",
+    "Mainstream Platforms",
+    "Common / Web",
+];
+
+fn presets_for_category(cat: u32) -> &'static [(&'static str, u32, u32)] {
+    match cat {
+        0 => &[
+            ("Mastodon Post (1920 x 1080)", 1920, 1080),
+            ("Mastodon Profile (400 x 400)", 400, 400),
+            ("Mastodon Header (1500 x 500)", 1500, 500),
+            ("Pixelfed Post (1080 x 1080)", 1080, 1080),
+            ("Pixelfed Story (1080 x 1920)", 1080, 1920),
+            ("Bluesky Post (1200 x 630)", 1200, 630),
+            ("Bluesky Profile (400 x 400)", 400, 400),
+            ("Bluesky Banner (1500 x 500)", 1500, 500),
+            ("Lemmy Post (1200 x 630)", 1200, 630),
+            ("PeerTube Thumbnail (1280 x 720)", 1280, 720),
+            ("Friendica Post (1200 x 630)", 1200, 630),
+            ("Funkwhale Cover (1400 x 1400)", 1400, 1400),
+        ],
+        1 => &[
+            ("Instagram Post Square (1080 x 1080)", 1080, 1080),
+            ("Instagram Post Portrait (1080 x 1350)", 1080, 1350),
+            ("Instagram Story/Reel (1080 x 1920)", 1080, 1920),
+            ("Facebook Post (1200 x 630)", 1200, 630),
+            ("Facebook Cover (820 x 312)", 820, 312),
+            ("Facebook Profile (170 x 170)", 170, 170),
+            ("YouTube Thumbnail (1280 x 720)", 1280, 720),
+            ("YouTube Channel Art (2560 x 1440)", 2560, 1440),
+            ("LinkedIn Post (1200 x 627)", 1200, 627),
+            ("LinkedIn Cover (1584 x 396)", 1584, 396),
+            ("LinkedIn Profile (400 x 400)", 400, 400),
+            ("Pinterest Pin (1000 x 1500)", 1000, 1500),
+            ("TikTok Video Cover (1080 x 1920)", 1080, 1920),
+            ("Threads Post (1080 x 1080)", 1080, 1080),
+        ],
+        _ => &[
+            ("4K UHD (3840 x 2160)", 3840, 2160),
+            ("Full HD (1920 x 1080)", 1920, 1080),
+            ("HD Ready (1280 x 720)", 1280, 720),
+            ("Blog Standard (800 wide)", 800, 0),
+            ("Email Header (600 x 200)", 600, 200),
+            ("Large Thumbnail (300 x 300)", 300, 300),
+            ("Small Thumbnail (150 x 150)", 150, 150),
+            ("Favicon (32 x 32)", 32, 32),
+        ],
+    }
+}
+
+fn rebuild_size_model(size_row: &adw::ComboRow, cat: u32) {
+    let presets = presets_for_category(cat);
+    let mut names: Vec<&str> = vec!["(select a size)"];
+    names.extend(presets.iter().map(|p| p.0));
+    size_row.set_model(Some(&gtk::StringList::new(&names)));
+    size_row.set_list_factory(Some(&super::full_text_list_factory()));
+    size_row.set_selected(0);
+}
+
+pub fn build_resize_page(state: &AppState) -> adw::NavigationPage {
+    let cfg = state.job_config.borrow();
+
+    // === OUTER LAYOUT ===
+    let outer = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(0)
+        .vexpand(true)
+        .build();
+
+    // --- Enable toggle (full width) ---
+    let enable_group = adw::PreferencesGroup::builder()
+        .margin_start(12)
+        .margin_end(12)
+        .margin_top(12)
+        .build();
+    let enable_row = adw::SwitchRow::builder()
+        .title("Enable Resize")
+        .subtitle("Scale images to new dimensions")
+        .active(cfg.resize_enabled)
+        .tooltip_text("Toggle resizing of images on or off")
+        .build();
+    enable_group.add(&enable_row);
+    outer.append(&enable_group);
+
+    // --- Horizontal split: Preview (left 60%) | Controls (right 40%) ---
+    let split = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(12)
+        .margin_start(12)
+        .margin_end(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .vexpand(true)
+        .build();
+
+    // ========== LEFT: Preview ==========
+    let preview_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(8)
+        .hexpand(true)
+        .valign(gtk::Align::Start)
+        .build();
+
+    let thumb_picture = gtk::Picture::builder()
+        .content_fit(gtk::ContentFit::Contain)
+        .height_request(250)
+        .hexpand(true)
+        .build();
+    thumb_picture.add_css_class("card");
+    thumb_picture.update_property(&[
+        gtk::accessible::Property::Label("Resize preview - click to cycle images"),
+    ]);
+
+    let dims_label = gtk::Label::builder()
+        .css_classes(["dim-label", "caption"])
+        .halign(gtk::Align::Center)
+        .margin_top(4)
+        .build();
+
+    let no_preview_label = gtk::Label::builder()
+        .label("Add images to see resize preview")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Center)
+        .build();
+
+    preview_box.append(&thumb_picture);
+    preview_box.append(&dims_label);
+    preview_box.append(&no_preview_label);
+
+    // ========== RIGHT: Controls ==========
+    let controls_scroll = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .width_request(340)
+        .build();
+
+    let controls = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .build();
+
+    // --- Group 1: Preset (two-level: category then size) ---
+    let preset_group = adw::PreferencesGroup::builder()
+        .title("Preset")
+        .description("Pick a category, then a size")
+        .build();
+
+    let category_row = adw::ComboRow::builder()
+        .title("Category")
+        .use_subtitle(true)
+        .tooltip_text("Choose a category of size presets")
+        .build();
+    category_row.set_model(Some(&gtk::StringList::new(CATEGORIES)));
+    category_row.set_list_factory(Some(&super::full_text_list_factory()));
+
+    let size_row = adw::ComboRow::builder()
+        .title("Size")
+        .subtitle("Select a preset to fill dimensions")
+        .use_subtitle(true)
+        .tooltip_text("Pick a preset size to fill dimensions")
+        .build();
+    rebuild_size_model(&size_row, 0);
+
+    preset_group.add(&category_row);
+    preset_group.add(&size_row);
+    controls.append(&preset_group);
+
+    // --- Group 2: Dimensions ---
+    let dims_group = adw::PreferencesGroup::builder()
+        .title("Dimensions")
+        .build();
+
+    // Custom horizontal row: [W] [width_spin] [lock] [height_spin] [H] [px|%]
+    let dim_row = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(6)
+        .margin_start(12)
+        .margin_end(12)
+        .margin_top(10)
+        .margin_bottom(10)
+        .halign(gtk::Align::Center)
+        .build();
+
+    let w_label = gtk::Label::builder()
+        .label("W")
+        .css_classes(["dim-label"])
+        .build();
+    w_label.set_accessible_role(gtk::AccessibleRole::Presentation);
+    let width_spin = gtk::SpinButton::builder()
+        .adjustment(&gtk::Adjustment::new(
+            cfg.resize_width as f64, 0.0, 10000.0, 1.0, 100.0, 0.0,
+        ))
+        .numeric(true)
+        .width_chars(6)
+        .tooltip_text("Width")
+        .build();
+    width_spin.update_property(&[
+        gtk::accessible::Property::Label("Width"),
+    ]);
+
+    let lock_btn = gtk::ToggleButton::builder()
+        .icon_name("changes-prevent-symbolic")
+        .active(true)
+        .tooltip_text("Aspect ratio locked")
+        .build();
+    lock_btn.update_property(&[
+        gtk::accessible::Property::Label("Lock aspect ratio"),
+    ]);
+
+    let height_spin = gtk::SpinButton::builder()
+        .adjustment(&gtk::Adjustment::new(
+            cfg.resize_height as f64, 0.0, 10000.0, 1.0, 100.0, 0.0,
+        ))
+        .numeric(true)
+        .width_chars(6)
+        .tooltip_text("Height")
+        .build();
+    height_spin.update_property(&[
+        gtk::accessible::Property::Label("Height"),
+    ]);
+    let h_label = gtk::Label::builder()
+        .label("H")
+        .css_classes(["dim-label"])
+        .build();
+    h_label.set_accessible_role(gtk::AccessibleRole::Presentation);
+
+    // Unit segmented toggle (px / %)
+    let unit_box = gtk::Box::new(gtk::Orientation::Horizontal, 0);
+    unit_box.add_css_class("linked");
+    unit_box.update_property(&[
+        gtk::accessible::Property::Label("Dimension unit toggle"),
+    ]);
+    let px_btn = gtk::Button::builder()
+        .label("px")
+        .tooltip_text("Use pixel dimensions (currently active)")
+        .build();
+    px_btn.update_property(&[
+        gtk::accessible::Property::Label("Pixels - currently active"),
+    ]);
+    let pct_btn = gtk::Button::builder()
+        .label("%")
+        .tooltip_text("Use percentage dimensions")
+        .build();
+    pct_btn.update_property(&[
+        gtk::accessible::Property::Label("Percentage"),
+    ]);
+    px_btn.add_css_class("suggested-action");
+    unit_box.append(&px_btn);
+    unit_box.append(&pct_btn);
+
+    dim_row.append(&w_label);
+    dim_row.append(&width_spin);
+    dim_row.append(&lock_btn);
+    dim_row.append(&height_spin);
+    dim_row.append(&h_label);
+    dim_row.append(&unit_box);
+    dims_group.add(&dim_row);
+
+    // Mode
+    let mode_row = adw::ComboRow::builder()
+        .title("Mode")
+        .subtitle("How dimensions are applied to images")
+        .use_subtitle(true)
+        .tooltip_text("Exact stretches to dimensions; Fit keeps aspect ratio")
+        .build();
+    mode_row.set_model(Some(&gtk::StringList::new(&[
+        "Exact Size",
+        "Fit Within Box",
+    ])));
+    mode_row.set_list_factory(Some(&super::full_text_list_factory()));
+
+    // Upscale
+    let upscale_row = adw::SwitchRow::builder()
+        .title("Allow Upscaling")
+        .subtitle("Enlarge images smaller than target size")
+        .active(cfg.allow_upscale)
+        .tooltip_text("When off, images smaller than target are left as-is")
+        .build();
+
+    dims_group.add(&mode_row);
+    dims_group.add(&upscale_row);
+    controls.append(&dims_group);
+
+    // --- Group 3: Advanced ---
+    let advanced_group = adw::PreferencesGroup::builder()
+        .title("Advanced")
+        .build();
+    let advanced_expander = adw::ExpanderRow::builder()
+        .title("Advanced Settings")
+        .subtitle("Resize algorithm and output DPI")
+        .show_enable_switch(false)
+        .expanded(state.is_section_expanded("resize-advanced"))
+        .build();
+    {
+        let st = state.clone();
+        advanced_expander.connect_expanded_notify(move |row| {
+            st.set_section_expanded("resize-advanced", row.is_expanded());
+        });
+    }
+
+    let algorithm_row = adw::ComboRow::builder()
+        .title("Resize Algorithm")
+        .use_subtitle(true)
+        .build();
+    algorithm_row.set_model(Some(&gtk::StringList::new(&[
+        "Lanczos3 (Best quality)",
+        "CatmullRom (Good, faster)",
+        "Bilinear (Fast)",
+        "Nearest (Pixelated)",
+    ])));
+    algorithm_row.set_list_factory(Some(&super::full_text_list_factory()));
+
+    let dpi_row = adw::SpinRow::builder()
+        .title("DPI")
+        .subtitle("Output resolution in dots per inch")
+        .adjustment(&gtk::Adjustment::new(72.0, 72.0, 600.0, 1.0, 10.0, 0.0))
+        .build();
+
+    advanced_expander.add_row(&algorithm_row);
+    advanced_expander.add_row(&dpi_row);
+    advanced_group.add(&advanced_expander);
+    controls.append(&advanced_group);
+
+    controls_scroll.set_child(Some(&controls));
+
+    split.append(&preview_box);
+    split.append(&controls_scroll);
+    outer.append(&split);
+
+    // === SHARED STATE ===
+    let preview_width = std::rc::Rc::new(std::cell::RefCell::new(cfg.resize_width));
+    let preview_height = std::rc::Rc::new(std::cell::RefCell::new(cfg.resize_height));
+    let preview_upscale = std::rc::Rc::new(std::cell::Cell::new(cfg.allow_upscale));
+    let preview_mode = std::rc::Rc::new(std::cell::Cell::new(cfg.resize_mode));
+    let preview_algo = std::rc::Rc::new(std::cell::Cell::new(0u32));
+    let preview_index = std::rc::Rc::new(std::cell::Cell::new(0usize));
+    let is_pct = std::rc::Rc::new(std::cell::Cell::new(false));
+    let updating = std::rc::Rc::new(std::cell::Cell::new(false));
+    let loaded_files = state.loaded_files.clone();
+
+    drop(cfg);
+
+    // === RENDER CLOSURE ===
+    let resize_preview_gen: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let render_thumb = {
+        let lf = loaded_files.clone();
+        let pw = preview_width.clone();
+        let ph = preview_height.clone();
+        let pu = preview_upscale.clone();
+        let pm = preview_mode.clone();
+        let pa = preview_algo.clone();
+        let pi = preview_index.clone();
+        let pic = thumb_picture.clone();
+        let dlbl = dims_label.clone();
+        let npl = no_preview_label.clone();
+        let bind_gen = resize_preview_gen.clone();
+        std::rc::Rc::new(move || {
+            let files = lf.borrow();
+            if files.is_empty() {
+                pic.set_paintable(gtk::gdk::Paintable::NONE);
+                pic.set_visible(false);
+                npl.set_visible(true);
+                npl.set_label("Add images to see resize preview");
+                dlbl.set_label("");
+                return;
+            }
+            let idx = pi.get() % files.len();
+            let Some(current) = files.get(idx) else { return };
+            pic.set_visible(true);
+            npl.set_visible(false);
+
+            let tw = *pw.borrow();
+            let th = *ph.borrow();
+            if tw == 0 && th == 0 {
+                pic.set_paintable(gtk::gdk::Paintable::NONE);
+                npl.set_visible(true);
+                npl.set_label("Set dimensions to preview");
+                pic.set_visible(false);
+                dlbl.set_label("");
+                return;
+            }
+
+            let file_count = files.len();
+            let (orig_w, orig_h) = get_image_dims(current.as_path());
+
+            let actual_tw = if tw > 0 { tw } else { orig_w };
+            let actual_th = if th > 0 {
+                th
+            } else if tw > 0 {
+                let scale = tw as f64 / orig_w as f64;
+                (orig_h as f64 * scale).round() as u32
+            } else {
+                orig_h
+            };
+
+            let allow_up = pu.get();
+            let (render_tw, render_th) = if !allow_up {
+                (actual_tw.min(orig_w), actual_th.min(orig_h))
+            } else {
+                (actual_tw, actual_th)
+            };
+
+            let scale_pct = if orig_w > 0 {
+                (render_tw as f64 / orig_w as f64 * 100.0).round() as u32
+            } else {
+                100
+            };
+
+            let counter = if file_count > 1 {
+                format!(" [{}/{}]", idx + 1, file_count)
+            } else {
+                String::new()
+            };
+
+            let clamp_note = if !allow_up && (actual_tw > orig_w || actual_th > orig_h) {
+                " (clamped)"
+            } else {
+                ""
+            };
+
+            dlbl.set_label(&format!(
+                "{} x {} -> {} x {} ({}%){}{}", orig_w, orig_h,
+                render_tw, render_th, scale_pct, clamp_note, counter,
+            ));
+
+            let my_gen = bind_gen.get().wrapping_add(1);
+            bind_gen.set(my_gen);
+            let gen_check = bind_gen.clone();
+
+            let path = current.clone();
+            let pic = pic.clone();
+            let algo = algo_index_to_filter(pa.get());
+            let mode = pm.get();
+            let (tx, rx) = std::sync::mpsc::channel::<Option<Vec<u8>>>();
+            std::thread::spawn(move || {
+                let result = (|| -> Option<Vec<u8>> {
+                    let img = image::open(&path).ok()?;
+                    let target_w = if render_tw > 0 { render_tw } else { img.width().max(1) };
+                    let target_h = if render_th > 0 {
+                        render_th
+                    } else if img.width() > 0 {
+                        let scale = target_w as f64 / img.width() as f64;
+                        (img.height() as f64 * scale).round().max(1.0) as u32
+                    } else {
+                        target_w
+                    };
+                    let resized = if mode == 0 && render_th > 0 {
+                        // Exact: stretch to exact dimensions
+                        img.resize_exact(target_w.min(1024), target_h.min(1024), algo)
+                    } else {
+                        // Fit within box (or width-only): maintain aspect ratio
+                        img.resize(target_w.min(1024), target_h.min(1024), algo)
+                    };
+                    let mut buf = Vec::new();
+                    resized.write_to(
+                        &mut std::io::Cursor::new(&mut buf),
+                        image::ImageFormat::Png,
+                    ).ok()?;
+                    Some(buf)
+                })();
+                let _ = tx.send(result);
+            });
+            glib::timeout_add_local(std::time::Duration::from_millis(100), move || {
+                if gen_check.get() != my_gen {
+                    return glib::ControlFlow::Break;
+                }
+                match rx.try_recv() {
+                    Ok(Some(bytes)) => {
+                        let gbytes = glib::Bytes::from(&bytes);
+                        if let Ok(texture) = gtk::gdk::Texture::from_bytes(&gbytes) {
+                            pic.set_paintable(Some(&texture));
+                        }
+                        glib::ControlFlow::Break
+                    }
+                    Ok(None) => glib::ControlFlow::Break,
+                    Err(std::sync::mpsc::TryRecvError::Empty) => glib::ControlFlow::Continue,
+                    Err(_) => glib::ControlFlow::Break,
+                }
+            });
+        })
+    };
+
+    // === WIRE SIGNALS ===
+
+    // Enable toggle
+    {
+        let jc = state.job_config.clone();
+        enable_row.connect_active_notify(move |row| {
+            jc.borrow_mut().resize_enabled = row.is_active();
+        });
+    }
+
+    // Category selection - rebuild the size dropdown
+    {
+        let sr = size_row.clone();
+        category_row.connect_selected_notify(move |row| {
+            rebuild_size_model(&sr, row.selected());
+        });
+    }
+
+    // Size selection - auto-fill dimensions and lock aspect ratio
+    {
+        let ws = width_spin.clone();
+        let hs = height_spin.clone();
+        let lb = lock_btn.clone();
+        let jc = state.job_config.clone();
+        let pw = preview_width.clone();
+        let ph = preview_height.clone();
+        let upd = updating.clone();
+        let ip = is_pct.clone();
+        let px = px_btn.clone();
+        let pct = pct_btn.clone();
+        let rt = render_thumb.clone();
+        let cr = category_row.clone();
+        size_row.connect_selected_notify(move |row| {
+            let sel = row.selected() as usize;
+            if sel == 0 {
+                return; // "(select a size)" - don't change anything
+            }
+            let presets = presets_for_category(cr.selected());
+            let Some(&(_, w, h)) = presets.get(sel - 1) else { return };
+
+            // Switch to pixels if currently in percentage
+            if ip.get() {
+                ip.set(false);
+                px.add_css_class("suggested-action");
+                pct.remove_css_class("suggested-action");
+                ws.set_range(0.0, 10000.0);
+                ws.set_increments(1.0, 100.0);
+                hs.set_range(0.0, 10000.0);
+                hs.set_increments(1.0, 100.0);
+            }
+
+            upd.set(true);
+            ws.set_value(w as f64);
+            hs.set_value(h as f64);
+            upd.set(false);
+
+            // Lock aspect ratio
+            if !lb.is_active() {
+                lb.set_active(true);
+            }
+
+            let mut c = jc.borrow_mut();
+            c.resize_width = w;
+            c.resize_height = h;
+            *pw.borrow_mut() = w;
+            *ph.borrow_mut() = h;
+
+            rt();
+        });
+    }
+
+    // Lock button icon change
+    {
+        let lb = lock_btn.clone();
+        lock_btn.connect_active_notify(move |btn| {
+            if btn.is_active() {
+                lb.set_icon_name("changes-prevent-symbolic");
+                lb.set_tooltip_text(Some("Aspect ratio locked"));
+                lb.update_property(&[
+                    gtk::accessible::Property::Label("Aspect ratio locked - click to unlock"),
+                ]);
+            } else {
+                lb.set_icon_name("changes-allow-symbolic");
+                lb.set_tooltip_text(Some("Aspect ratio unlocked"));
+                lb.update_property(&[
+                    gtk::accessible::Property::Label("Aspect ratio unlocked - click to lock"),
+                ]);
+            }
+        });
+    }
+
+    // Width spin with aspect lock
+    {
+        let jc = state.job_config.clone();
+        let pw = preview_width.clone();
+        let ph = preview_height.clone();
+        let rt = render_thumb.clone();
+        let lb = lock_btn.clone();
+        let hs = height_spin.clone();
+        let files = state.loaded_files.clone();
+        let upd = updating.clone();
+        let ip = is_pct.clone();
+        let pr = size_row.clone();
+        width_spin.connect_value_notify(move |spin| {
+            if upd.get() { return; }
+            let val = spin.value();
+
+            let pixel_val = if ip.get() {
+                let dims = get_first_image_dims(&files.borrow());
+                (val / 100.0 * dims.0 as f64).round() as u32
+            } else {
+                val as u32
+            };
+
+            jc.borrow_mut().resize_width = pixel_val;
+            *pw.borrow_mut() = pixel_val;
+
+            // Reset preset to Custom when manually editing
+            if pr.selected() != 0 {
+                upd.set(true);
+                pr.set_selected(0);
+                upd.set(false);
+            }
+
+            if lb.is_active() && val > 0.0 {
+                if ip.get() {
+                    upd.set(true);
+                    hs.set_value(val);
+                    let dims = get_first_image_dims(&files.borrow());
+                    let pixel_h = (val / 100.0 * dims.1 as f64).round() as u32;
+                    jc.borrow_mut().resize_height = pixel_h;
+                    *ph.borrow_mut() = pixel_h;
+                    upd.set(false);
+                } else {
+                    let aspect = get_first_image_aspect(&files.borrow());
+                    if aspect > 0.0 {
+                        let new_h = (val / aspect).round() as u32;
+                        upd.set(true);
+                        hs.set_value(new_h as f64);
+                        jc.borrow_mut().resize_height = new_h;
+                        *ph.borrow_mut() = new_h;
+                        upd.set(false);
+                    }
+                }
+            }
+
+            rt();
+        });
+    }
+
+    // Height spin with aspect lock
+    {
+        let jc = state.job_config.clone();
+        let pw = preview_width.clone();
+        let ph = preview_height.clone();
+        let rt = render_thumb.clone();
+        let lb = lock_btn.clone();
+        let ws = width_spin.clone();
+        let files = state.loaded_files.clone();
+        let upd = updating.clone();
+        let ip = is_pct.clone();
+        let pr = size_row.clone();
+        height_spin.connect_value_notify(move |spin| {
+            if upd.get() { return; }
+            let val = spin.value();
+
+            let pixel_val = if ip.get() {
+                let dims = get_first_image_dims(&files.borrow());
+                (val / 100.0 * dims.1 as f64).round() as u32
+            } else {
+                val as u32
+            };
+
+            jc.borrow_mut().resize_height = pixel_val;
+            *ph.borrow_mut() = pixel_val;
+
+            // Reset preset to Custom when manually editing
+            if pr.selected() != 0 {
+                upd.set(true);
+                pr.set_selected(0);
+                upd.set(false);
+            }
+
+            if lb.is_active() && val > 0.0 {
+                if ip.get() {
+                    upd.set(true);
+                    ws.set_value(val);
+                    let dims = get_first_image_dims(&files.borrow());
+                    let pixel_w = (val / 100.0 * dims.0 as f64).round() as u32;
+                    jc.borrow_mut().resize_width = pixel_w;
+                    *pw.borrow_mut() = pixel_w;
+                    upd.set(false);
+                } else {
+                    let aspect = get_first_image_aspect(&files.borrow());
+                    if aspect > 0.0 {
+                        let new_w = (val * aspect).round() as u32;
+                        upd.set(true);
+                        ws.set_value(new_w as f64);
+                        jc.borrow_mut().resize_width = new_w;
+                        *pw.borrow_mut() = new_w;
+                        upd.set(false);
+                    }
+                }
+            }
+
+            rt();
+        });
+    }
+
+    // Unit toggle: px button
+    {
+        let pct = pct_btn.clone();
+        let px = px_btn.clone();
+        let ip = is_pct.clone();
+        let ws = width_spin.clone();
+        let hs = height_spin.clone();
+        let files = state.loaded_files.clone();
+        let upd = updating.clone();
+        let jc = state.job_config.clone();
+        let pw = preview_width.clone();
+        let ph = preview_height.clone();
+        let rt = render_thumb.clone();
+        px_btn.connect_clicked(move |_| {
+            if !ip.get() { return; } // already pixels
+            ip.set(false);
+            px.add_css_class("suggested-action");
+            pct.remove_css_class("suggested-action");
+            px.update_property(&[
+                gtk::accessible::Property::Label("Pixels - currently active"),
+            ]);
+            pct.update_property(&[
+                gtk::accessible::Property::Label("Percentage"),
+            ]);
+            px.set_tooltip_text(Some("Use pixel dimensions (currently active)"));
+            pct.set_tooltip_text(Some("Use percentage dimensions"));
+
+            let dims = get_first_image_dims(&files.borrow());
+            let pct_w = ws.value();
+            let pct_h = hs.value();
+            let pixel_w = (pct_w / 100.0 * dims.0 as f64).round();
+            let pixel_h = (pct_h / 100.0 * dims.1 as f64).round();
+
+            upd.set(true);
+            ws.set_range(0.0, 10000.0);
+            ws.set_increments(1.0, 100.0);
+            hs.set_range(0.0, 10000.0);
+            hs.set_increments(1.0, 100.0);
+            ws.set_value(pixel_w);
+            hs.set_value(pixel_h);
+            upd.set(false);
+
+            let mut c = jc.borrow_mut();
+            c.resize_width = pixel_w as u32;
+            c.resize_height = pixel_h as u32;
+            *pw.borrow_mut() = pixel_w as u32;
+            *ph.borrow_mut() = pixel_h as u32;
+
+            rt();
+        });
+    }
+
+    // Unit toggle: % button
+    {
+        let px = px_btn.clone();
+        let pct = pct_btn.clone();
+        let ip = is_pct.clone();
+        let ws = width_spin.clone();
+        let hs = height_spin.clone();
+        let files = state.loaded_files.clone();
+        let upd = updating.clone();
+        let rt = render_thumb.clone();
+        let jc = state.job_config.clone();
+        let pw = preview_width.clone();
+        let ph = preview_height.clone();
+        pct_btn.connect_clicked(move |_| {
+            if ip.get() { return; } // already percentage
+            ip.set(true);
+            pct.add_css_class("suggested-action");
+            px.remove_css_class("suggested-action");
+            pct.update_property(&[
+                gtk::accessible::Property::Label("Percentage - currently active"),
+            ]);
+            px.update_property(&[
+                gtk::accessible::Property::Label("Pixels"),
+            ]);
+            pct.set_tooltip_text(Some("Use percentage dimensions (currently active)"));
+            px.set_tooltip_text(Some("Use pixel dimensions"));
+
+            let dims = get_first_image_dims(&files.borrow());
+            let cur_w = ws.value();
+            let cur_h = hs.value();
+            let pct_w = if dims.0 > 0 { (cur_w / dims.0 as f64 * 100.0).round() } else { 100.0 };
+            let pct_h = if dims.1 > 0 { (cur_h / dims.1 as f64 * 100.0).round() } else { 100.0 };
+
+            upd.set(true);
+            ws.set_range(0.0, 1000.0);
+            ws.set_increments(1.0, 10.0);
+            hs.set_range(0.0, 1000.0);
+            hs.set_increments(1.0, 10.0);
+            ws.set_value(pct_w);
+            hs.set_value(pct_h);
+            upd.set(false);
+
+            // Update job_config with the pixel values
+            let pixel_w = (pct_w / 100.0 * dims.0 as f64).round() as u32;
+            let pixel_h = (pct_h / 100.0 * dims.1 as f64).round() as u32;
+            let mut c = jc.borrow_mut();
+            c.resize_width = pixel_w;
+            c.resize_height = pixel_h;
+            *pw.borrow_mut() = pixel_w;
+            *ph.borrow_mut() = pixel_h;
+
+            rt();
+        });
+    }
+
+    // Mode toggle - update labels and job_config
+    {
+        let ws = width_spin.clone();
+        let hs = height_spin.clone();
+        let jc = state.job_config.clone();
+        let rt = render_thumb.clone();
+        let pmode = preview_mode.clone();
+        mode_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().resize_mode = row.selected();
+            pmode.set(row.selected());
+            if row.selected() == 1 {
+                ws.set_tooltip_text(Some("Maximum width"));
+                hs.set_tooltip_text(Some("Maximum height"));
+            } else {
+                ws.set_tooltip_text(Some("Width"));
+                hs.set_tooltip_text(Some("Height"));
+            }
+            rt();
+        });
+    }
+
+    // Upscale toggle
+    {
+        let jc = state.job_config.clone();
+        let pu = preview_upscale.clone();
+        let rt = render_thumb.clone();
+        upscale_row.connect_active_notify(move |row| {
+            jc.borrow_mut().allow_upscale = row.is_active();
+            pu.set(row.is_active());
+            rt();
+        });
+    }
+
+    // Algorithm
+    {
+        let jc = state.job_config.clone();
+        let pa = preview_algo.clone();
+        let rt = render_thumb.clone();
+        algorithm_row.connect_selected_notify(move |row| {
+            jc.borrow_mut().resize_algorithm = row.selected();
+            pa.set(row.selected());
+            rt();
+        });
+    }
+
+    // DPI
+    {
+        let jc = state.job_config.clone();
+        dpi_row.connect_value_notify(move |row| {
+            jc.borrow_mut().output_dpi = row.value() as u32;
+        });
+    }
+
+    // Click preview to cycle images
+    {
+        let pi = preview_index.clone();
+        let rt = render_thumb.clone();
+        let lf = loaded_files.clone();
+        let click = gtk::GestureClick::new();
+        click.connect_released(move |gesture, _, _, _| {
+            let count = lf.borrow().len();
+            if count > 1 {
+                pi.set((pi.get() + 1) % count);
+                rt();
+            }
+            gesture.set_state(gtk::EventSequenceState::Claimed);
+        });
+        thumb_picture.set_can_target(true);
+        thumb_picture.set_focusable(true);
+        thumb_picture.add_controller(click);
+        thumb_picture.set_cursor_from_name(Some("pointer"));
+    }
+
+    // Keyboard support for preview cycling (Space/Enter)
+    {
+        let pi = preview_index.clone();
+        let rt = render_thumb.clone();
+        let lf = loaded_files.clone();
+        let key = gtk::EventControllerKey::new();
+        key.connect_key_pressed(move |_, keyval, _, _| {
+            if keyval == gtk::gdk::Key::space || keyval == gtk::gdk::Key::Return {
+                let count = lf.borrow().len();
+                if count > 1 {
+                    pi.set((pi.get() + 1) % count);
+                    rt();
+                }
+                return glib::Propagation::Stop;
+            }
+            glib::Propagation::Proceed
+        });
+        thumb_picture.add_controller(key);
+    }
+
+    // Initial render
+    {
+        let rt = render_thumb.clone();
+        glib::idle_add_local_once(move || rt());
+    }
+
+    let page = adw::NavigationPage::builder()
+        .title("Resize")
+        .tag("step-resize")
+        .child(&outer)
+        .build();
+
+    // Sync enable toggle and re-render on page map
+    {
+        let rt = render_thumb.clone();
+        let jc = state.job_config.clone();
+        let er = enable_row.clone();
+        page.connect_map(move |_| {
+            let enabled = jc.borrow().resize_enabled;
+            er.set_active(enabled);
+            rt();
+        });
+    }
+
+    page
+}

pixstrip-gtk/src/steps/step_watermark.rs

@@ -0,0 +1,941 @@
+use adw::prelude::*;
+use gtk::glib;
+use std::cell::Cell;
+use std::rc::Rc;
+
+use crate::app::AppState;
+
+pub fn build_watermark_page(state: &AppState) -> adw::NavigationPage {
+    let cfg = state.job_config.borrow();
+
+    // === OUTER LAYOUT ===
+    let outer = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(0)
+        .vexpand(true)
+        .build();
+
+    // --- Enable toggle (full width) ---
+    let enable_group = adw::PreferencesGroup::builder()
+        .margin_start(12)
+        .margin_end(12)
+        .margin_top(12)
+        .build();
+    let enable_row = adw::SwitchRow::builder()
+        .title("Enable Watermark")
+        .subtitle("Add text or image watermark to processed images")
+        .active(cfg.watermark_enabled)
+        .tooltip_text("Toggle watermark on or off")
+        .build();
+    enable_group.add(&enable_row);
+    outer.append(&enable_group);
+
+    // === LEFT SIDE: Preview ===
+
+    let preview_picture = gtk::Picture::builder()
+        .content_fit(gtk::ContentFit::Contain)
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    preview_picture.set_can_target(true);
+    preview_picture.set_focusable(true);
+    preview_picture.update_property(&[
+        gtk::accessible::Property::Label("Watermark preview - press Space to cycle images"),
+    ]);
+
+    let info_label = gtk::Label::builder()
+        .label("No images loaded")
+        .css_classes(["dim-label", "caption"])
+        .halign(gtk::Align::Center)
+        .margin_top(4)
+        .margin_bottom(4)
+        .build();
+
+    let preview_frame = gtk::Frame::builder()
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    preview_frame.set_child(Some(&preview_picture));
+
+    let preview_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(4)
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    preview_box.append(&preview_frame);
+    preview_box.append(&info_label);
+
+    // === RIGHT SIDE: Controls (scrollable) ===
+
+    let controls = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_start(12)
+        .build();
+
+    // --- Watermark type ---
+    let type_group = adw::PreferencesGroup::builder()
+        .title("Watermark Type")
+        .build();
+
+    let type_row = adw::ComboRow::builder()
+        .title("Type")
+        .subtitle("Choose text or image watermark")
+        .use_subtitle(true)
+        .tooltip_text("Choose between text or image/logo overlay")
+        .build();
+    type_row.set_model(Some(&gtk::StringList::new(&["Text Watermark", "Image Watermark"])));
+    type_row.set_list_factory(Some(&super::full_text_list_factory()));
+    type_row.set_selected(if cfg.watermark_use_image { 1 } else { 0 });
+
+    type_group.add(&type_row);
+    controls.append(&type_group);
+
+    // --- Text watermark settings ---
+    let text_group = adw::PreferencesGroup::builder()
+        .title("Text Watermark")
+        .visible(!cfg.watermark_use_image)
+        .build();
+
+    let text_row = adw::EntryRow::builder()
+        .title("Watermark Text")
+        .text(&cfg.watermark_text)
+        .tooltip_text("The text that appears as a watermark on each image")
+        .build();
+
+    let font_row = adw::ActionRow::builder()
+        .title("Font Family")
+        .subtitle("Choose a typeface for the watermark text")
+        .build();
+
+    let font_dialog = gtk::FontDialog::builder()
+        .title("Choose Watermark Font")
+        .modal(true)
+        .build();
+    let font_button = gtk::FontDialogButton::builder()
+        .dialog(&font_dialog)
+        .valign(gtk::Align::Center)
+        .build();
+
+    if !cfg.watermark_font_family.is_empty() {
+        let desc = gtk::pango::FontDescription::from_string(&cfg.watermark_font_family);
+        font_button.set_font_desc(&desc);
+    }
+    font_button.update_property(&[
+        gtk::accessible::Property::Label("Choose watermark font"),
+    ]);
+    font_row.add_suffix(&font_button);
+
+    let font_size_row = adw::SpinRow::builder()
+        .title("Font Size")
+        .subtitle("Size in pixels")
+        .adjustment(&gtk::Adjustment::new(cfg.watermark_font_size as f64, 8.0, 200.0, 1.0, 10.0, 0.0))
+        .tooltip_text("Size of watermark text in pixels")
+        .build();
+
+    text_group.add(&text_row);
+    text_group.add(&font_row);
+    text_group.add(&font_size_row);
+    controls.append(&text_group);
+
+    // --- Image watermark settings ---
+    let image_group = adw::PreferencesGroup::builder()
+        .title("Image Watermark")
+        .visible(cfg.watermark_use_image)
+        .build();
+
+    let image_path_row = adw::ActionRow::builder()
+        .title("Logo Image")
+        .subtitle(
+            cfg.watermark_image_path
+                .as_ref()
+                .map(|p| p.display().to_string())
+                .unwrap_or_else(|| "No image selected".to_string()),
+        )
+        .activatable(true)
+        .build();
+    let image_prefix_icon = gtk::Image::from_icon_name("image-x-generic-symbolic");
+    image_prefix_icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    image_path_row.add_prefix(&image_prefix_icon);
+
+    let choose_image_button = gtk::Button::builder()
+        .icon_name("document-open-symbolic")
+        .tooltip_text("Choose logo image")
+        .valign(gtk::Align::Center)
+        .has_frame(false)
+        .build();
+    choose_image_button.update_property(&[
+        gtk::accessible::Property::Label("Choose logo image"),
+    ]);
+    image_path_row.add_suffix(&choose_image_button);
+
+    image_group.add(&image_path_row);
+    controls.append(&image_group);
+
+    // --- Position group with 3x3 grid ---
+    let position_group = adw::PreferencesGroup::builder()
+        .title("Position")
+        .description("Choose where the watermark appears on the image")
+        .build();
+
+    let position_names = [
+        "Top Left", "Top Center", "Top Right",
+        "Middle Left", "Center", "Middle Right",
+        "Bottom Left", "Bottom Center", "Bottom Right",
+    ];
+
+    let grid = gtk::Grid::builder()
+        .row_spacing(4)
+        .column_spacing(4)
+        .halign(gtk::Align::Center)
+        .margin_top(8)
+        .margin_bottom(8)
+        .build();
+
+    // Frame styled to look like a miniature image
+    let grid_outer = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .halign(gtk::Align::Center)
+        .build();
+
+    let grid_frame = gtk::Frame::builder()
+        .halign(gtk::Align::Center)
+        .build();
+    grid_frame.set_child(Some(&grid));
+    grid_frame.update_property(&[
+        gtk::accessible::Property::Label("Watermark position grid. Select where the watermark appears on the image."),
+    ]);
+
+    // Image outline label above the grid
+    let grid_title = gtk::Label::builder()
+        .label("Image")
+        .css_classes(["dim-label", "caption"])
+        .halign(gtk::Align::Center)
+        .margin_bottom(4)
+        .build();
+
+    grid_outer.append(&grid_title);
+    grid_outer.append(&grid_frame);
+
+    let mut first_button: Option<gtk::ToggleButton> = None;
+    let buttons: Vec<gtk::ToggleButton> = position_names.iter().enumerate().map(|(i, name)| {
+        let btn = gtk::ToggleButton::builder()
+            .tooltip_text(*name)
+            .width_request(48)
+            .height_request(48)
+            .build();
+
+        btn.update_property(&[
+            gtk::accessible::Property::Label(&format!("Watermark position: {}", name)),
+        ]);
+
+        let icon = if i == cfg.watermark_position as usize {
+            "radio-checked-symbolic"
+        } else {
+            "radio-symbolic"
+        };
+        btn.set_child(Some(&gtk::Image::from_icon_name(icon)));
+        btn.set_active(i == cfg.watermark_position as usize);
+
+        if let Some(ref first) = first_button {
+            btn.set_group(Some(first));
+        } else {
+            first_button = Some(btn.clone());
+        }
+
+        let row = i / 3;
+        let col = i % 3;
+        grid.attach(&btn, col as i32, row as i32, 1, 1);
+
+        btn
+    }).collect();
+
+    position_group.add(&grid_outer);
+
+    let position_label = gtk::Label::builder()
+        .label(position_names.get(cfg.watermark_position as usize).copied().unwrap_or("Center"))
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Center)
+        .margin_bottom(4)
+        .build();
+    position_group.add(&position_label);
+
+    controls.append(&position_group);
+
+    // --- Advanced options ---
+    let advanced_group = adw::PreferencesGroup::builder()
+        .title("Advanced")
+        .build();
+
+    let advanced_expander = adw::ExpanderRow::builder()
+        .title("Advanced Options")
+        .subtitle("Color, opacity, rotation, tiling, margin, scale")
+        .show_enable_switch(false)
+        .expanded(state.is_section_expanded("watermark-advanced"))
+        .build();
+
+    {
+        let st = state.clone();
+        advanced_expander.connect_expanded_notify(move |row| {
+            st.set_section_expanded("watermark-advanced", row.is_expanded());
+        });
+    }
+
+    // Text color picker
+    let color_row = adw::ActionRow::builder()
+        .title("Text Color")
+        .subtitle("Color of the watermark text")
+        .build();
+
+    let initial_color = gtk::gdk::RGBA::new(
+        cfg.watermark_color[0] as f32 / 255.0,
+        cfg.watermark_color[1] as f32 / 255.0,
+        cfg.watermark_color[2] as f32 / 255.0,
+        cfg.watermark_color[3] as f32 / 255.0,
+    );
+    let color_dialog = gtk::ColorDialog::builder()
+        .with_alpha(true)
+        .title("Watermark Text Color")
+        .build();
+    let color_button = gtk::ColorDialogButton::builder()
+        .dialog(&color_dialog)
+        .rgba(&initial_color)
+        .valign(gtk::Align::Center)
+        .build();
+    color_button.update_property(&[
+        gtk::accessible::Property::Label("Choose watermark text color"),
+    ]);
+    color_row.add_suffix(&color_button);
+
+    // Opacity slider + reset
+    let opacity_row = adw::ActionRow::builder()
+        .title("Opacity")
+        .subtitle(&format!("{}%", (cfg.watermark_opacity * 100.0).round() as i32))
+        .build();
+    let opacity_scale = gtk::Scale::with_range(gtk::Orientation::Horizontal, 0.0, 100.0, 1.0);
+    opacity_scale.set_value((cfg.watermark_opacity * 100.0) as f64);
+    opacity_scale.set_draw_value(false);
+    opacity_scale.set_hexpand(false);
+    opacity_scale.set_valign(gtk::Align::Center);
+    opacity_scale.set_width_request(180);
+    opacity_scale.update_property(&[
+        gtk::accessible::Property::Label("Watermark opacity, 0 to 100 percent"),
+    ]);
+    let opacity_reset = gtk::Button::builder()
+        .icon_name("edit-undo-symbolic")
+        .valign(gtk::Align::Center)
+        .tooltip_text("Reset to 50%")
+        .has_frame(false)
+        .build();
+    opacity_reset.update_property(&[
+        gtk::accessible::Property::Label("Reset opacity to 50%"),
+    ]);
+    opacity_reset.set_sensitive((cfg.watermark_opacity - 0.5).abs() > 0.01);
+    opacity_row.add_suffix(&opacity_scale);
+    opacity_row.add_suffix(&opacity_reset);
+
+    // Rotation slider + reset (-180 to +180)
+    let rotation_row = adw::ActionRow::builder()
+        .title("Rotation")
+        .subtitle(&format!("{} degrees", cfg.watermark_rotation))
+        .build();
+    let rotation_scale = gtk::Scale::with_range(gtk::Orientation::Horizontal, -180.0, 180.0, 1.0);
+    rotation_scale.set_value(cfg.watermark_rotation as f64);
+    rotation_scale.set_draw_value(false);
+    rotation_scale.set_hexpand(false);
+    rotation_scale.set_valign(gtk::Align::Center);
+    rotation_scale.set_width_request(180);
+    rotation_scale.update_property(&[
+        gtk::accessible::Property::Label("Watermark rotation, -180 to +180 degrees"),
+    ]);
+    let rotation_reset = gtk::Button::builder()
+        .icon_name("edit-undo-symbolic")
+        .valign(gtk::Align::Center)
+        .tooltip_text("Reset to 0 degrees")
+        .has_frame(false)
+        .build();
+    rotation_reset.update_property(&[
+        gtk::accessible::Property::Label("Reset rotation to 0 degrees"),
+    ]);
+    rotation_reset.set_sensitive(cfg.watermark_rotation != 0);
+    rotation_row.add_suffix(&rotation_scale);
+    rotation_row.add_suffix(&rotation_reset);
+
+    // Tiled toggle
+    let tiled_row = adw::SwitchRow::builder()
+        .title("Tiled / Repeated")
+        .subtitle("Repeat watermark across the entire image")
+        .active(cfg.watermark_tiled)
+        .tooltip_text("Repeat the watermark in a grid pattern across the entire image")
+        .build();
+
+    // Margin slider + reset
+    let margin_row = adw::ActionRow::builder()
+        .title("Margin from Edges")
+        .subtitle(&format!("{} px", cfg.watermark_margin))
+        .build();
+    let margin_scale = gtk::Scale::with_range(gtk::Orientation::Horizontal, 0.0, 200.0, 1.0);
+    margin_scale.set_value(cfg.watermark_margin as f64);
+    margin_scale.set_draw_value(false);
+    margin_scale.set_hexpand(false);
+    margin_scale.set_valign(gtk::Align::Center);
+    margin_scale.set_width_request(180);
+    margin_scale.update_property(&[
+        gtk::accessible::Property::Label("Watermark margin from edges, 0 to 200 pixels"),
+    ]);
+    let margin_reset = gtk::Button::builder()
+        .icon_name("edit-undo-symbolic")
+        .valign(gtk::Align::Center)
+        .tooltip_text("Reset to 10 px")
+        .has_frame(false)
+        .build();
+    margin_reset.update_property(&[
+        gtk::accessible::Property::Label("Reset margin to 10 pixels"),
+    ]);
+    margin_reset.set_sensitive(cfg.watermark_margin != 10);
+    margin_row.add_suffix(&margin_scale);
+    margin_row.add_suffix(&margin_reset);
+
+    // Scale slider + reset (only relevant for image watermarks)
+    let scale_row = adw::ActionRow::builder()
+        .title("Scale (% of image)")
+        .subtitle(&format!("{}%", cfg.watermark_scale.round() as i32))
+        .visible(cfg.watermark_use_image)
+        .build();
+    let scale_scale = gtk::Scale::with_range(gtk::Orientation::Horizontal, 1.0, 100.0, 1.0);
+    scale_scale.set_value(cfg.watermark_scale as f64);
+    scale_scale.set_draw_value(false);
+    scale_scale.set_hexpand(false);
+    scale_scale.set_valign(gtk::Align::Center);
+    scale_scale.set_width_request(180);
+    scale_scale.update_property(&[
+        gtk::accessible::Property::Label("Watermark scale, 1 to 100 percent of image"),
+    ]);
+    let scale_reset = gtk::Button::builder()
+        .icon_name("edit-undo-symbolic")
+        .valign(gtk::Align::Center)
+        .tooltip_text("Reset to 20%")
+        .has_frame(false)
+        .build();
+    scale_reset.update_property(&[
+        gtk::accessible::Property::Label("Reset scale to 20%"),
+    ]);
+    scale_reset.set_sensitive((cfg.watermark_scale - 20.0).abs() > 0.5);
+    scale_row.add_suffix(&scale_scale);
+    scale_row.add_suffix(&scale_reset);
+
+    advanced_expander.add_row(&color_row);
+    advanced_expander.add_row(&opacity_row);
+    advanced_expander.add_row(&rotation_row);
+    advanced_expander.add_row(&tiled_row);
+    advanced_expander.add_row(&margin_row);
+    advanced_expander.add_row(&scale_row);
+
+    advanced_group.add(&advanced_expander);
+    controls.append(&advanced_group);
+
+    // Scrollable controls
+    let controls_scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .width_request(360)
+        .child(&controls)
+        .build();
+
+    // === Main layout: 60/40 side-by-side ===
+    let main_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(12)
+        .margin_end(12)
+        .vexpand(true)
+        .build();
+
+    preview_box.set_width_request(400);
+    main_box.append(&preview_box);
+    main_box.append(&controls_scrolled);
+    outer.append(&main_box);
+
+    // Preview state
+    let preview_index: Rc<Cell<usize>> = Rc::new(Cell::new(0));
+
+    drop(cfg);
+
+    // === Preview update closure ===
+    let preview_gen: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let update_preview = {
+        let files = state.loaded_files.clone();
+        let jc = state.job_config.clone();
+        let pic = preview_picture.clone();
+        let info = info_label.clone();
+        let pidx = preview_index.clone();
+        let bind_gen = preview_gen.clone();
+
+        Rc::new(move || {
+            let loaded = files.borrow();
+            if loaded.is_empty() {
+                info.set_label("No images loaded");
+                pic.set_paintable(gtk::gdk::Paintable::NONE);
+                return;
+            }
+
+            let idx = pidx.get().min(loaded.len().saturating_sub(1));
+            pidx.set(idx);
+            let path = loaded[idx].clone();
+            let name = path.file_name().and_then(|n| n.to_str()).unwrap_or("image");
+            info.set_label(&format!("[{}/{}] {}", idx + 1, loaded.len(), name));
+
+            let cfg = jc.borrow();
+            let wm_text = cfg.watermark_text.clone();
+            let wm_use_image = cfg.watermark_use_image;
+            let wm_image_path = cfg.watermark_image_path.clone();
+            let wm_position = cfg.watermark_position;
+            let wm_opacity = cfg.watermark_opacity;
+            let wm_font_size = cfg.watermark_font_size;
+            let wm_color = cfg.watermark_color;
+            let wm_font_family = cfg.watermark_font_family.clone();
+            let wm_tiled = cfg.watermark_tiled;
+            let wm_margin = cfg.watermark_margin;
+            let wm_scale = cfg.watermark_scale;
+            let wm_rotation = cfg.watermark_rotation;
+            let wm_enabled = cfg.watermark_enabled;
+            drop(cfg);
+
+            let my_gen = bind_gen.get().wrapping_add(1);
+            bind_gen.set(my_gen);
+            let gen_check = bind_gen.clone();
+
+            let pic = pic.clone();
+            let (tx, rx) = std::sync::mpsc::channel::<Option<Vec<u8>>>();
+            std::thread::spawn(move || {
+                let result = (|| -> Option<Vec<u8>> {
+                    let img = image::open(&path).ok()?;
+                    let img = img.resize(1024, 1024, image::imageops::FilterType::Triangle);
+
+                    let img = if wm_enabled {
+                        let position = match wm_position {
+                            0 => pixstrip_core::operations::WatermarkPosition::TopLeft,
+                            1 => pixstrip_core::operations::WatermarkPosition::TopCenter,
+                            2 => pixstrip_core::operations::WatermarkPosition::TopRight,
+                            3 => pixstrip_core::operations::WatermarkPosition::MiddleLeft,
+                            4 => pixstrip_core::operations::WatermarkPosition::Center,
+                            5 => pixstrip_core::operations::WatermarkPosition::MiddleRight,
+                            6 => pixstrip_core::operations::WatermarkPosition::BottomLeft,
+                            7 => pixstrip_core::operations::WatermarkPosition::BottomCenter,
+                            _ => pixstrip_core::operations::WatermarkPosition::BottomRight,
+                        };
+                        let rotation = if wm_rotation != 0 {
+                            Some(pixstrip_core::operations::WatermarkRotation::Custom(wm_rotation as f32))
+                        } else {
+                            None
+                        };
+
+                        let wm_config = if wm_use_image {
+                            wm_image_path.as_ref().map(|p| {
+                                pixstrip_core::operations::WatermarkConfig::Image {
+                                    path: p.clone(),
+                                    position,
+                                    opacity: wm_opacity,
+                                    scale: wm_scale / 100.0,
+                                    rotation,
+                                    tiled: wm_tiled,
+                                    margin: wm_margin,
+                                }
+                            })
+                        } else if !wm_text.is_empty() {
+                            Some(pixstrip_core::operations::WatermarkConfig::Text {
+                                text: wm_text,
+                                position,
+                                font_size: wm_font_size,
+                                opacity: wm_opacity,
+                                color: wm_color,
+                                font_family: if wm_font_family.is_empty() { None } else { Some(wm_font_family) },
+                                rotation,
+                                tiled: wm_tiled,
+                                margin: wm_margin,
+                            })
+                        } else {
+                            None
+                        };
+
+                        if let Some(config) = wm_config {
+                            pixstrip_core::operations::watermark::apply_watermark(img, &config).ok()?
+                        } else {
+                            img
+                        }
+                    } else {
+                        img
+                    };
+
+                    let mut buf = Vec::new();
+                    img.write_to(
+                        &mut std::io::Cursor::new(&mut buf),
+                        image::ImageFormat::Png,
+                    ).ok()?;
+                    Some(buf)
+                })();
+                let _ = tx.send(result);
+            });
+
+            glib::timeout_add_local(std::time::Duration::from_millis(100), move || {
+                if gen_check.get() != my_gen {
+                    return glib::ControlFlow::Break;
+                }
+                match rx.try_recv() {
+                    Ok(Some(bytes)) => {
+                        let gbytes = glib::Bytes::from(&bytes);
+                        if let Ok(texture) = gtk::gdk::Texture::from_bytes(&gbytes) {
+                            pic.set_paintable(Some(&texture));
+                        }
+                        glib::ControlFlow::Break
+                    }
+                    Ok(None) => glib::ControlFlow::Break,
+                    Err(std::sync::mpsc::TryRecvError::Empty) => glib::ControlFlow::Continue,
+                    Err(_) => glib::ControlFlow::Break,
+                }
+            });
+        })
+    };
+
+    // Click-to-cycle on preview
+    {
+        let click = gtk::GestureClick::new();
+        let pidx = preview_index.clone();
+        let files = state.loaded_files.clone();
+        let up = update_preview.clone();
+        click.connect_released(move |_, _, _, _| {
+            let loaded = files.borrow();
+            if loaded.len() > 1 {
+                let next = (pidx.get() + 1) % loaded.len();
+                pidx.set(next);
+                up();
+            }
+        });
+        preview_picture.add_controller(click);
+    }
+
+    // Keyboard support for preview cycling (Space/Enter)
+    {
+        let key = gtk::EventControllerKey::new();
+        let pidx = preview_index.clone();
+        let files = state.loaded_files.clone();
+        let up = update_preview.clone();
+        key.connect_key_pressed(move |_, keyval, _, _| {
+            if keyval == gtk::gdk::Key::space || keyval == gtk::gdk::Key::Return {
+                let loaded = files.borrow();
+                if loaded.len() > 1 {
+                    let next = (pidx.get() + 1) % loaded.len();
+                    pidx.set(next);
+                    up();
+                }
+                return gtk::glib::Propagation::Stop;
+            }
+            gtk::glib::Propagation::Proceed
+        });
+        preview_picture.add_controller(key);
+    }
+
+    // === Wire signals ===
+
+    // Enable toggle
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        enable_row.connect_active_notify(move |row| {
+            jc.borrow_mut().watermark_enabled = row.is_active();
+            up();
+        });
+    }
+
+    // Type selector
+    {
+        let jc = state.job_config.clone();
+        let text_group_c = text_group.clone();
+        let image_group_c = image_group.clone();
+        let scale_row_c = scale_row.clone();
+        let up = update_preview.clone();
+        type_row.connect_selected_notify(move |row| {
+            let use_image = row.selected() == 1;
+            jc.borrow_mut().watermark_use_image = use_image;
+            text_group_c.set_visible(!use_image);
+            image_group_c.set_visible(use_image);
+            scale_row_c.set_visible(use_image);
+            up();
+        });
+    }
+
+    // Text entry (debounced to avoid preview on every keystroke)
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        let debounce_id: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+        text_row.connect_changed(move |row| {
+            let text = row.text().to_string();
+            jc.borrow_mut().watermark_text = text;
+            let up = up.clone();
+            let did = debounce_id.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(300), move || {
+                if did.get() == id {
+                    up();
+                }
+            });
+        });
+    }
+
+    // Font family
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        font_button.connect_font_desc_notify(move |btn| {
+            if let Some(desc) = btn.font_desc() {
+                if let Some(family) = desc.family() {
+                    jc.borrow_mut().watermark_font_family = family.to_string();
+                    up();
+                }
+            }
+        });
+    }
+
+    // Font size
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        font_size_row.connect_value_notify(move |row| {
+            jc.borrow_mut().watermark_font_size = row.value() as f32;
+            up();
+        });
+    }
+
+    // Position grid buttons
+    for (i, btn) in buttons.iter().enumerate() {
+        let jc = state.job_config.clone();
+        let label = position_label.clone();
+        let names = position_names;
+        let all_buttons = buttons.clone();
+        let up = update_preview.clone();
+        btn.connect_toggled(move |b| {
+            if b.is_active() {
+                jc.borrow_mut().watermark_position = i as u32;
+                label.set_label(names[i]);
+                for (j, other) in all_buttons.iter().enumerate() {
+                    let icon_name = if j == i {
+                        "radio-checked-symbolic"
+                    } else {
+                        "radio-symbolic"
+                    };
+                    other.set_child(Some(&gtk::Image::from_icon_name(icon_name)));
+                }
+                up();
+            }
+        });
+    }
+
+    // Color picker
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        color_button.connect_rgba_notify(move |btn| {
+            let c = btn.rgba();
+            jc.borrow_mut().watermark_color = [
+                (c.red() * 255.0) as u8,
+                (c.green() * 255.0) as u8,
+                (c.blue() * 255.0) as u8,
+                (c.alpha() * 255.0) as u8,
+            ];
+            up();
+        });
+    }
+
+    // Per-slider debounce counters (separate to avoid cross-slider cancellation)
+    let opacity_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let rotation_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let margin_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+    let scale_debounce: Rc<Cell<u32>> = Rc::new(Cell::new(0));
+
+    // Opacity slider
+    {
+        let jc = state.job_config.clone();
+        let row = opacity_row.clone();
+        let up = update_preview.clone();
+        let rst = opacity_reset.clone();
+        let did = opacity_debounce.clone();
+        opacity_scale.connect_value_changed(move |scale| {
+            let val = scale.value().round() as i32;
+            let opacity = val as f32 / 100.0;
+            jc.borrow_mut().watermark_opacity = opacity;
+            row.set_subtitle(&format!("{}%", val));
+            rst.set_sensitive(val != 50);
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id { up(); }
+            });
+        });
+    }
+    {
+        let scale = opacity_scale.clone();
+        opacity_reset.connect_clicked(move |_| {
+            scale.set_value(50.0);
+        });
+    }
+
+    // Rotation slider
+    {
+        let jc = state.job_config.clone();
+        let row = rotation_row.clone();
+        let up = update_preview.clone();
+        let rst = rotation_reset.clone();
+        let did = rotation_debounce.clone();
+        rotation_scale.connect_value_changed(move |scale| {
+            let val = scale.value().round() as i32;
+            jc.borrow_mut().watermark_rotation = val;
+            row.set_subtitle(&format!("{} degrees", val));
+            rst.set_sensitive(val != 0);
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id { up(); }
+            });
+        });
+    }
+    {
+        let scale = rotation_scale.clone();
+        rotation_reset.connect_clicked(move |_| {
+            scale.set_value(0.0);
+        });
+    }
+
+    // Tiled toggle
+    {
+        let jc = state.job_config.clone();
+        let up = update_preview.clone();
+        tiled_row.connect_active_notify(move |row| {
+            jc.borrow_mut().watermark_tiled = row.is_active();
+            up();
+        });
+    }
+
+    // Margin slider
+    {
+        let jc = state.job_config.clone();
+        let row = margin_row.clone();
+        let up = update_preview.clone();
+        let rst = margin_reset.clone();
+        let did = margin_debounce.clone();
+        margin_scale.connect_value_changed(move |scale| {
+            let val = scale.value().round() as i32;
+            jc.borrow_mut().watermark_margin = val as u32;
+            row.set_subtitle(&format!("{} px", val));
+            rst.set_sensitive(val != 10);
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id { up(); }
+            });
+        });
+    }
+    {
+        let scale = margin_scale.clone();
+        margin_reset.connect_clicked(move |_| {
+            scale.set_value(10.0);
+        });
+    }
+
+    // Scale slider
+    {
+        let jc = state.job_config.clone();
+        let row = scale_row.clone();
+        let up = update_preview.clone();
+        let rst = scale_reset.clone();
+        let did = scale_debounce.clone();
+        scale_scale.connect_value_changed(move |scale| {
+            let val = scale.value().round() as i32;
+            jc.borrow_mut().watermark_scale = val as f32;
+            row.set_subtitle(&format!("{}%", val));
+            rst.set_sensitive((val - 20).abs() > 0);
+            let up = up.clone();
+            let did = did.clone();
+            let id = did.get().wrapping_add(1);
+            did.set(id);
+            glib::timeout_add_local_once(std::time::Duration::from_millis(150), move || {
+                if did.get() == id { up(); }
+            });
+        });
+    }
+    {
+        let scale = scale_scale.clone();
+        scale_reset.connect_clicked(move |_| {
+            scale.set_value(20.0);
+        });
+    }
+
+    // Image chooser button
+    {
+        let jc = state.job_config.clone();
+        let path_row = image_path_row.clone();
+        let up = update_preview.clone();
+        choose_image_button.connect_clicked(move |btn| {
+            let jc = jc.clone();
+            let path_row = path_row.clone();
+            let up = up.clone();
+            let dialog = gtk::FileDialog::builder()
+                .title("Choose Watermark Image")
+                .modal(true)
+                .build();
+
+            let filter = gtk::FileFilter::new();
+            filter.set_name(Some("Images"));
+            filter.add_mime_type("image/png");
+            filter.add_mime_type("image/svg+xml");
+            let filters = gtk::gio::ListStore::new::<gtk::FileFilter>();
+            filters.append(&filter);
+            dialog.set_filters(Some(&filters));
+
+            if let Some(window) = btn.root().and_then(|r| r.downcast::<gtk::Window>().ok()) {
+                dialog.open(Some(&window), gtk::gio::Cancellable::NONE, move |result| {
+                    if let Ok(file) = result
+                        && let Some(path) = file.path()
+                    {
+                        path_row.set_subtitle(&path.display().to_string());
+                        jc.borrow_mut().watermark_image_path = Some(path);
+                        up();
+                    }
+                });
+            }
+        });
+    }
+
+    let page = adw::NavigationPage::builder()
+        .title("Watermark")
+        .tag("step-watermark")
+        .child(&outer)
+        .build();
+
+    // Sync enable toggle, refresh preview and sensitivity when navigating to this page
+    {
+        let up = update_preview.clone();
+        let lf = state.loaded_files.clone();
+        let ctrl = controls.clone();
+        let jc = state.job_config.clone();
+        let er = enable_row.clone();
+        page.connect_map(move |_| {
+            let enabled = jc.borrow().watermark_enabled;
+            er.set_active(enabled);
+            ctrl.set_sensitive(!lf.borrow().is_empty());
+            up();
+        });
+    }
+
+    page
+}

pixstrip-gtk/src/steps/step_workflow.rs

@@ -0,0 +1,699 @@
+use adw::prelude::*;
+use pixstrip_core::preset::Preset;
+use pixstrip_core::operations::*;
+use crate::app::{AppState, JobConfig, MetadataMode};
+
+pub fn build_workflow_page(state: &AppState) -> adw::NavigationPage {
+    let scrolled = gtk::ScrolledWindow::builder()
+        .hscrollbar_policy(gtk::PolicyType::Never)
+        .vexpand(true)
+        .build();
+
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    // Built-in presets section
+    let builtin_group = adw::PreferencesGroup::builder()
+        .title("Built-in Workflows")
+        .description("Select a preset to get started quickly")
+        .build();
+
+    let builtin_flow = gtk::FlowBox::builder()
+        .selection_mode(gtk::SelectionMode::Single)
+        .max_children_per_line(5)
+        .min_children_per_line(2)
+        .row_spacing(8)
+        .column_spacing(8)
+        .homogeneous(true)
+        .build();
+
+    builtin_flow.update_property(&[
+        gtk::accessible::Property::Label("Workflow preset selection grid"),
+    ]);
+
+    // Custom card is always first (index 0)
+    let custom_card = build_custom_card();
+    builtin_flow.append(&custom_card);
+
+    // Then all built-in presets (indices 1..=9)
+    let builtins = Preset::all_builtins();
+    for preset in &builtins {
+        let card = build_preset_card(preset);
+        builtin_flow.append(&card);
+    }
+
+    // Custom workflow section (hidden until Custom card is selected)
+    let custom_group = adw::PreferencesGroup::builder()
+        .title("Custom Workflow")
+        .description("Choose which operations to include, then click Next")
+        .visible(false)
+        .build();
+
+    let resize_check = adw::SwitchRow::builder()
+        .title("Resize")
+        .subtitle("Scale images to new dimensions")
+        .active(state.job_config.borrow().resize_enabled)
+        .build();
+
+    let adjustments_check = adw::SwitchRow::builder()
+        .title("Adjustments")
+        .subtitle("Rotate, flip, brightness, contrast, effects")
+        .active(state.job_config.borrow().adjustments_enabled)
+        .build();
+
+    let convert_check = adw::SwitchRow::builder()
+        .title("Convert")
+        .subtitle("Change image format (JPEG, PNG, WebP, AVIF)")
+        .active(state.job_config.borrow().convert_enabled)
+        .build();
+
+    let compress_check = adw::SwitchRow::builder()
+        .title("Compress")
+        .subtitle("Reduce file size with quality control")
+        .active(state.job_config.borrow().compress_enabled)
+        .build();
+
+    let metadata_check = adw::SwitchRow::builder()
+        .title("Metadata")
+        .subtitle("Strip or modify EXIF, GPS, camera data")
+        .active(state.job_config.borrow().metadata_enabled)
+        .build();
+
+    let watermark_check = adw::SwitchRow::builder()
+        .title("Watermark")
+        .subtitle("Add text or image overlay")
+        .active(state.job_config.borrow().watermark_enabled)
+        .build();
+
+    let rename_check = adw::SwitchRow::builder()
+        .title("Rename")
+        .subtitle("Rename files with prefix, suffix, or template")
+        .active(state.job_config.borrow().rename_enabled)
+        .build();
+
+    custom_group.add(&resize_check);
+    custom_group.add(&adjustments_check);
+    custom_group.add(&convert_check);
+    custom_group.add(&compress_check);
+    custom_group.add(&metadata_check);
+    custom_group.add(&watermark_check);
+    custom_group.add(&rename_check);
+
+    // When a card is activated: Custom shows toggles, presets apply config and advance
+    {
+        let jc = state.job_config.clone();
+        let custom_group_c = custom_group.clone();
+        builtin_flow.connect_child_activated(move |flow, child| {
+            let idx = child.index() as usize;
+            if idx == 0 {
+                // Custom card - show toggles, don't advance, enable step-by-step mode
+                jc.borrow_mut().preset_mode = false;
+                custom_group_c.set_visible(true);
+            } else {
+                // Built-in preset - apply config, skip intermediate steps, advance
+                custom_group_c.set_visible(false);
+                if let Some(preset) = builtins.get(idx - 1) {
+                    let mut cfg = jc.borrow_mut();
+                    apply_preset_to_config(&mut cfg, preset);
+                    cfg.preset_mode = true;
+                }
+                flow.activate_action("win.next-step", None).ok();
+            }
+        });
+    }
+
+    let builtin_clamp = adw::Clamp::builder()
+        .maximum_size(1200)
+        .child(&builtin_flow)
+        .build();
+    builtin_group.add(&builtin_clamp);
+    content.append(&builtin_group);
+
+    // Wire custom operation toggles to job config
+    {
+        let jc = state.job_config.clone();
+        resize_check.connect_active_notify(move |row| {
+            jc.borrow_mut().resize_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        adjustments_check.connect_active_notify(move |row| {
+            jc.borrow_mut().adjustments_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        convert_check.connect_active_notify(move |row| {
+            jc.borrow_mut().convert_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        compress_check.connect_active_notify(move |row| {
+            jc.borrow_mut().compress_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        metadata_check.connect_active_notify(move |row| {
+            jc.borrow_mut().metadata_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        watermark_check.connect_active_notify(move |row| {
+            jc.borrow_mut().watermark_enabled = row.is_active();
+        });
+    }
+    {
+        let jc = state.job_config.clone();
+        rename_check.connect_active_notify(move |row| {
+            jc.borrow_mut().rename_enabled = row.is_active();
+        });
+    }
+
+    // User presets section
+    let user_group = adw::PreferencesGroup::builder()
+        .title("Your Presets")
+        .description("Import or save your own workflows")
+        .build();
+
+    // FlowBox for user preset cards (same look as built-in presets)
+    let user_flow = gtk::FlowBox::builder()
+        .selection_mode(gtk::SelectionMode::Single)
+        .max_children_per_line(5)
+        .min_children_per_line(2)
+        .row_spacing(8)
+        .column_spacing(8)
+        .homogeneous(true)
+        .build();
+    user_flow.update_property(&[
+        gtk::accessible::Property::Label("Your saved preset selection grid"),
+    ]);
+
+    let user_clamp = adw::Clamp::builder()
+        .maximum_size(1200)
+        .child(&user_flow)
+        .build();
+
+    let user_empty_label = gtk::Label::builder()
+        .label("No saved presets yet. Process images and save your workflow as a preset, or import one.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Center)
+        .wrap(true)
+        .justify(gtk::Justification::Center)
+        .margin_top(8)
+        .margin_bottom(8)
+        .build();
+
+    user_group.add(&user_clamp);
+    user_group.add(&user_empty_label);
+
+    content.append(&user_group);
+    content.append(&custom_group);
+
+    scrolled.set_child(Some(&content));
+
+    // Drop target for .pixstrip-preset files
+    let drop_target = gtk::DropTarget::new(gtk::gio::File::static_type(), gtk::gdk::DragAction::COPY);
+    let jc_drop = state.job_config.clone();
+    drop_target.connect_drop(move |_target, value, _x, _y| {
+        if let Ok(file) = value.get::<gtk::gio::File>() {
+            if let Some(path) = file.path() {
+                if path.extension().and_then(|e| e.to_str()) == Some("pixstrip-preset") {
+                    let store = pixstrip_core::storage::PresetStore::new();
+                    if let Ok(preset) = store.import_from_file(&path) {
+                        apply_preset_to_config(&mut jc_drop.borrow_mut(), &preset);
+                        let _ = store.save(&preset);
+                        return true;
+                    }
+                }
+            }
+        }
+        false
+    });
+    scrolled.add_controller(drop_target);
+
+    let page = adw::NavigationPage::builder()
+        .title("Choose a Workflow")
+        .tag("step-workflow")
+        .child(&scrolled)
+        .build();
+
+    // Refresh user presets every time this page is shown
+    {
+        let uf = user_flow.clone();
+        let uel = user_empty_label.clone();
+        page.connect_map(move |_| {
+            // Clear existing cards
+            uf.remove_all();
+
+            let store = pixstrip_core::storage::PresetStore::new();
+            let mut has_custom = false;
+            if let Ok(presets) = store.list() {
+                for preset in &presets {
+                    if !preset.is_custom {
+                        continue;
+                    }
+                    has_custom = true;
+
+                    let overlay = gtk::Overlay::new();
+
+                    // Card body (same style as built-in presets)
+                    let card = gtk::Box::builder()
+                        .orientation(gtk::Orientation::Vertical)
+                        .spacing(8)
+                        .hexpand(true)
+                        .vexpand(false)
+                        .build();
+                    card.add_css_class("card");
+                    card.set_size_request(180, 140);
+                    card.update_property(&[
+                        gtk::accessible::Property::Label(&format!("{}: {}", preset.name, preset.description)),
+                    ]);
+
+                    let inner = gtk::Box::builder()
+                        .orientation(gtk::Orientation::Vertical)
+                        .spacing(4)
+                        .margin_top(12)
+                        .margin_bottom(12)
+                        .margin_start(12)
+                        .margin_end(12)
+                        .halign(gtk::Align::Center)
+                        .valign(gtk::Align::Center)
+                        .vexpand(true)
+                        .build();
+
+                    let icon = gtk::Image::builder()
+                        .icon_name(&preset.icon)
+                        .pixel_size(32)
+                        .build();
+                    icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+                    if !preset.icon_color.is_empty() {
+                        icon.add_css_class(&preset.icon_color);
+                    }
+
+                    let name_label = gtk::Label::builder()
+                        .label(&preset.name)
+                        .css_classes(["heading"])
+                        .ellipsize(gtk::pango::EllipsizeMode::End)
+                        .max_width_chars(16)
+                        .build();
+
+                    let desc_label = gtk::Label::builder()
+                        .label(&preset.description)
+                        .css_classes(["caption", "dim-label"])
+                        .wrap(true)
+                        .justify(gtk::Justification::Center)
+                        .max_width_chars(20)
+                        .build();
+
+                    inner.append(&icon);
+                    inner.append(&name_label);
+                    inner.append(&desc_label);
+                    card.append(&inner);
+                    overlay.set_child(Some(&card));
+
+                    // Action buttons overlay (top-right corner)
+                    let actions_box = gtk::Box::builder()
+                        .orientation(gtk::Orientation::Horizontal)
+                        .spacing(0)
+                        .halign(gtk::Align::End)
+                        .valign(gtk::Align::Start)
+                        .margin_top(2)
+                        .margin_end(2)
+                        .build();
+
+                    let export_btn = gtk::Button::builder()
+                        .icon_name("document-save-as-symbolic")
+                        .tooltip_text("Export preset")
+                        .build();
+                    export_btn.add_css_class("flat");
+                    export_btn.add_css_class("circular");
+                    let preset_for_export = preset.clone();
+                    export_btn.connect_clicked(move |btn| {
+                        let p = preset_for_export.clone();
+                        let dialog = gtk::FileDialog::builder()
+                            .title("Export Preset")
+                            .initial_name(&format!("{}.pixstrip-preset", p.name))
+                            .modal(true)
+                            .build();
+                        if let Some(window) = btn.root().and_then(|r| r.downcast::<gtk::Window>().ok()) {
+                            dialog.save(Some(&window), gtk::gio::Cancellable::NONE, move |result| {
+                                if let Ok(file) = result
+                                    && let Some(path) = file.path()
+                                {
+                                    let store = pixstrip_core::storage::PresetStore::new();
+                                    let _ = store.export_to_file(&p, &path);
+                                }
+                            });
+                        }
+                    });
+
+                    let delete_btn = gtk::Button::builder()
+                        .icon_name("user-trash-symbolic")
+                        .tooltip_text("Delete preset")
+                        .build();
+                    delete_btn.add_css_class("flat");
+                    delete_btn.add_css_class("circular");
+                    delete_btn.add_css_class("error");
+                    let pname = preset.name.clone();
+                    let uf_ref = uf.clone();
+                    let uel_ref = uel.clone();
+                    delete_btn.connect_clicked(move |btn| {
+                        let store = pixstrip_core::storage::PresetStore::new();
+                        let _ = store.delete(&pname);
+                        // Remove the FlowBoxChild containing this card
+                        if let Some(child) = btn.ancestor(gtk::FlowBoxChild::static_type()) {
+                            if let Some(fbc) = child.downcast_ref::<gtk::FlowBoxChild>() {
+                                uf_ref.remove(fbc);
+                                // Show empty label if only the import card is left
+                                let mut c = uf_ref.first_child();
+                                let mut count = 0;
+                                while let Some(w) = c {
+                                    count += 1;
+                                    c = w.next_sibling();
+                                }
+                                uel_ref.set_visible(count <= 1);
+                            }
+                        }
+                    });
+
+                    actions_box.append(&export_btn);
+                    actions_box.append(&delete_btn);
+                    overlay.add_overlay(&actions_box);
+
+                    uf.append(&overlay);
+                }
+            }
+            uel.set_visible(!has_custom);
+
+            // Always append an "Import Preset" card at the end
+            let import_card = build_import_card();
+            uf.append(&import_card);
+        });
+    }
+
+    // Wire user preset card activation
+    {
+        let jc = state.job_config.clone();
+        user_flow.connect_child_activated(move |flow, child| {
+            // Count total children to know which is the import card (always last)
+            let mut total = 0usize;
+            let mut c = flow.first_child();
+            while let Some(w) = c {
+                total += 1;
+                c = w.next_sibling();
+            }
+
+            let activated_idx = child.index() as usize;
+
+            // Last card is always the import card
+            if activated_idx == total - 1 {
+                flow.activate_action("win.import-preset", None).ok();
+                return;
+            }
+
+            let store = pixstrip_core::storage::PresetStore::new();
+            if let Ok(presets) = store.list() {
+                let custom_presets: Vec<_> = presets.iter().filter(|p| p.is_custom).collect();
+                if let Some(preset) = custom_presets.get(activated_idx) {
+                    let mut cfg = jc.borrow_mut();
+                    apply_preset_to_config(&mut cfg, preset);
+                    cfg.preset_mode = true;
+                    drop(cfg);
+                    flow.activate_action("win.next-step", None).ok();
+                }
+            }
+        });
+    }
+
+    page
+}
+
+fn apply_preset_to_config(cfg: &mut JobConfig, preset: &Preset) {
+    // Resize
+    match &preset.resize {
+        Some(ResizeConfig::ByWidth(w)) => {
+            cfg.resize_enabled = true;
+            cfg.resize_width = *w;
+            cfg.resize_height = 0;
+            cfg.allow_upscale = false;
+        }
+        Some(ResizeConfig::ByHeight(h)) => {
+            cfg.resize_enabled = true;
+            cfg.resize_width = 0;
+            cfg.resize_height = *h;
+            cfg.allow_upscale = false;
+        }
+        Some(ResizeConfig::FitInBox { max, allow_upscale }) => {
+            cfg.resize_enabled = true;
+            cfg.resize_width = max.width;
+            cfg.resize_height = max.height;
+            cfg.allow_upscale = *allow_upscale;
+        }
+        Some(ResizeConfig::Exact(dims)) => {
+            cfg.resize_enabled = true;
+            cfg.resize_width = dims.width;
+            cfg.resize_height = dims.height;
+            cfg.allow_upscale = true;
+        }
+        None => {
+            cfg.resize_enabled = false;
+        }
+    }
+
+    // Convert
+    match &preset.convert {
+        Some(ConvertConfig::SingleFormat(fmt)) => {
+            cfg.convert_enabled = true;
+            cfg.convert_format = Some(*fmt);
+        }
+        Some(_) => {
+            cfg.convert_enabled = true;
+            cfg.convert_format = None;
+        }
+        None => {
+            cfg.convert_enabled = false;
+            cfg.convert_format = None;
+        }
+    }
+
+    // Compress
+    match &preset.compress {
+        Some(CompressConfig::Preset(q)) => {
+            cfg.compress_enabled = true;
+            cfg.quality_preset = *q;
+        }
+        Some(CompressConfig::Custom { jpeg_quality, png_level, webp_quality, .. }) => {
+            cfg.compress_enabled = true;
+            if let Some(jq) = jpeg_quality {
+                cfg.jpeg_quality = *jq;
+            }
+            if let Some(pl) = png_level {
+                cfg.png_level = *pl;
+            }
+            if let Some(wq) = webp_quality {
+                cfg.webp_quality = *wq as u8;
+            }
+        }
+        None => {
+            cfg.compress_enabled = false;
+        }
+    }
+
+    // Metadata
+    match &preset.metadata {
+        Some(MetadataConfig::StripAll) => {
+            cfg.metadata_enabled = true;
+            cfg.metadata_mode = MetadataMode::StripAll;
+        }
+        Some(MetadataConfig::Privacy) => {
+            cfg.metadata_enabled = true;
+            cfg.metadata_mode = MetadataMode::Privacy;
+        }
+        Some(MetadataConfig::KeepAll) => {
+            cfg.metadata_enabled = true;
+            cfg.metadata_mode = MetadataMode::KeepAll;
+        }
+        Some(MetadataConfig::Custom { strip_gps, strip_camera, strip_software, strip_timestamps, strip_copyright }) => {
+            cfg.metadata_enabled = true;
+            cfg.metadata_mode = MetadataMode::Custom;
+            cfg.strip_gps = *strip_gps;
+            cfg.strip_camera = *strip_camera;
+            cfg.strip_software = *strip_software;
+            cfg.strip_timestamps = *strip_timestamps;
+            cfg.strip_copyright = *strip_copyright;
+        }
+        None => {
+            cfg.metadata_enabled = false;
+        }
+    }
+}
+
+fn build_custom_card() -> gtk::Box {
+    let card = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(8)
+        .hexpand(true)
+        .vexpand(false)
+        .build();
+    card.add_css_class("card");
+    card.set_size_request(180, 140);
+    card.update_property(&[
+        gtk::accessible::Property::Label("Custom: Pick and choose operations"),
+    ]);
+
+    let inner = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(4)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(12)
+        .margin_end(12)
+        .halign(gtk::Align::Center)
+        .valign(gtk::Align::Center)
+        .vexpand(true)
+        .build();
+
+    let icon = gtk::Image::builder()
+        .icon_name("emblem-system-symbolic")
+        .pixel_size(32)
+        .build();
+    icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+
+    let name_label = gtk::Label::builder()
+        .label("Custom")
+        .css_classes(["heading"])
+        .build();
+
+    let desc_label = gtk::Label::builder()
+        .label("Pick and choose operations")
+        .css_classes(["caption", "dim-label"])
+        .wrap(true)
+        .justify(gtk::Justification::Center)
+        .max_width_chars(20)
+        .build();
+
+    inner.append(&icon);
+    inner.append(&name_label);
+    inner.append(&desc_label);
+    card.append(&inner);
+
+    card
+}
+
+fn build_import_card() -> gtk::Box {
+    let card = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(8)
+        .hexpand(true)
+        .vexpand(false)
+        .build();
+    card.add_css_class("card");
+    card.set_size_request(180, 140);
+    card.set_tooltip_text(Some("Import a .pixstrip-preset file from disk"));
+    card.update_property(&[
+        gtk::accessible::Property::Label("Import preset from file"),
+    ]);
+
+    let inner = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(4)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(12)
+        .margin_end(12)
+        .halign(gtk::Align::Center)
+        .valign(gtk::Align::Center)
+        .vexpand(true)
+        .build();
+
+    let icon = gtk::Image::builder()
+        .icon_name("folder-open-symbolic")
+        .pixel_size(32)
+        .build();
+    icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+
+    let name_label = gtk::Label::builder()
+        .label("Import Preset")
+        .css_classes(["heading"])
+        .build();
+
+    let desc_label = gtk::Label::builder()
+        .label("Load a preset from file")
+        .css_classes(["caption", "dim-label"])
+        .wrap(true)
+        .justify(gtk::Justification::Center)
+        .max_width_chars(20)
+        .build();
+
+    inner.append(&icon);
+    inner.append(&name_label);
+    inner.append(&desc_label);
+    card.append(&inner);
+
+    card
+}
+
+fn build_preset_card(preset: &Preset) -> gtk::Box {
+    let card = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(8)
+        .hexpand(true)
+        .vexpand(false)
+        .build();
+    card.add_css_class("card");
+    card.set_size_request(180, 140);
+    card.update_property(&[
+        gtk::accessible::Property::Label(&format!("{}: {}", preset.name, preset.description)),
+    ]);
+
+    let inner = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(4)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(12)
+        .margin_end(12)
+        .halign(gtk::Align::Center)
+        .valign(gtk::Align::Center)
+        .vexpand(true)
+        .build();
+
+    let icon = gtk::Image::builder()
+        .icon_name(&preset.icon)
+        .pixel_size(32)
+        .build();
+    icon.set_accessible_role(gtk::AccessibleRole::Presentation);
+    if !preset.icon_color.is_empty() {
+        icon.add_css_class(&preset.icon_color);
+    }
+
+    let name_label = gtk::Label::builder()
+        .label(&preset.name)
+        .css_classes(["heading"])
+        .build();
+
+    let desc_label = gtk::Label::builder()
+        .label(&preset.description)
+        .css_classes(["caption", "dim-label"])
+        .wrap(true)
+        .justify(gtk::Justification::Center)
+        .max_width_chars(20)
+        .build();
+
+    inner.append(&icon);
+    inner.append(&name_label);
+    inner.append(&desc_label);
+    card.append(&inner);
+
+    card
+}

pixstrip-gtk/src/tutorial.rs

@@ -0,0 +1,239 @@
+use adw::prelude::*;
+use gtk::glib;
+
+/// Show the tutorial tour if the user hasn't completed it yet.
+/// Called after the welcome wizard closes on first launch.
+pub fn show_tutorial_if_needed(window: &adw::ApplicationWindow) {
+    let config_store = pixstrip_core::storage::ConfigStore::new();
+    if let Ok(cfg) = config_store.load()
+        && cfg.tutorial_complete
+    {
+        return;
+    }
+
+    // Small delay to let the welcome dialog fully dismiss
+    let win = window.clone();
+    glib::timeout_add_local_once(std::time::Duration::from_millis(400), move || {
+        show_tour_stop(&win, 0);
+    });
+}
+
+/// Tour stops: (title, description, widget_name, popover_position)
+fn tour_stops() -> Vec<(&'static str, &'static str, &'static str, gtk::PositionType)> {
+    vec![
+        (
+            "Choose a Workflow",
+            "Pick a preset that matches your needs, or scroll down to build a custom workflow from scratch.",
+            "tour-content",
+            gtk::PositionType::Bottom,
+        ),
+        (
+            "Track Your Progress",
+            "This bar shows where you are in the wizard. Click any completed step to jump back to it.",
+            "tour-step-indicator",
+            gtk::PositionType::Bottom,
+        ),
+        (
+            "Navigation",
+            "Use Back and Next to move between steps, or press Alt+Left / Alt+Right. Disabled steps are automatically skipped.",
+            "tour-next-button",
+            gtk::PositionType::Top,
+        ),
+        (
+            "Main Menu",
+            "Settings, keyboard shortcuts, processing history, and preset management live here.",
+            "tour-menu-button",
+            gtk::PositionType::Bottom,
+        ),
+        (
+            "Get Help",
+            "Every step has a help button with detailed guidance specific to that step.",
+            "tour-help-button",
+            gtk::PositionType::Bottom,
+        ),
+    ]
+}
+
+fn show_tour_stop(window: &adw::ApplicationWindow, index: usize) {
+    let stops = tour_stops();
+    let total = stops.len();
+    if index >= total {
+        mark_tutorial_complete();
+        return;
+    }
+
+    let (title, description, widget_name, position) = stops[index];
+
+    // Find the target widget by name in the widget tree
+    let Some(root) = window.content() else { return };
+    let Some(target) = find_widget_by_name(&root, widget_name) else {
+        // Widget not found - skip to next stop
+        show_tour_stop(window, index + 1);
+        return;
+    };
+
+    // Build popover content
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(8)
+        .margin_top(12)
+        .margin_bottom(12)
+        .margin_start(16)
+        .margin_end(16)
+        .build();
+    content.set_size_request(280, -1);
+
+    // Progress dots
+    let dots_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(6)
+        .halign(gtk::Align::Center)
+        .build();
+    for i in 0..total {
+        let dot = gtk::Label::builder()
+            .label(if i == index { "\u{25CF}" } else { "\u{25CB}" })
+            .build();
+        if i == index {
+            dot.add_css_class("accent");
+        } else {
+            dot.add_css_class("dim-label");
+        }
+        dots_box.append(&dot);
+    }
+    content.append(&dots_box);
+
+    // Title
+    let title_label = gtk::Label::builder()
+        .label(title)
+        .css_classes(["title-3"])
+        .halign(gtk::Align::Start)
+        .build();
+    content.append(&title_label);
+
+    // Description
+    let desc_label = gtk::Label::builder()
+        .label(description)
+        .wrap(true)
+        .max_width_chars(36)
+        .halign(gtk::Align::Start)
+        .xalign(0.0)
+        .build();
+    content.append(&desc_label);
+
+    // Step counter
+    let counter_label = gtk::Label::builder()
+        .label(&format!("{} of {}", index + 1, total))
+        .css_classes(["dim-label", "caption"])
+        .halign(gtk::Align::Start)
+        .build();
+    content.append(&counter_label);
+
+    // Buttons
+    let button_box = gtk::Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .spacing(12)
+        .halign(gtk::Align::End)
+        .margin_top(4)
+        .build();
+
+    let skip_btn = gtk::Button::builder()
+        .label("Skip Tour")
+        .tooltip_text("Close the tour and start using Pixstrip")
+        .build();
+    skip_btn.add_css_class("flat");
+
+    let is_last = index + 1 >= total;
+    let next_btn = gtk::Button::builder()
+        .label(if is_last { "Done" } else { "Next" })
+        .tooltip_text(if is_last { "Finish the tour" } else { "Go to the next tour stop" })
+        .build();
+    next_btn.add_css_class("suggested-action");
+    next_btn.add_css_class("pill");
+
+    button_box.append(&skip_btn);
+    button_box.append(&next_btn);
+    content.append(&button_box);
+
+    // Create popover attached to the target widget
+    let popover = gtk::Popover::builder()
+        .child(&content)
+        .position(position)
+        .autohide(false)
+        .has_arrow(true)
+        .build();
+    popover.set_parent(&target);
+
+    // For the content area (large widget), point to the upper portion
+    // where the preset cards are visible
+    if widget_name == "tour-content" {
+        let w = target.width();
+        if w > 0 {
+            let rect = gtk::gdk::Rectangle::new(w / 2 - 10, 40, 20, 20);
+            popover.set_pointing_to(Some(&rect));
+        }
+    }
+
+    // Accessible label for screen readers
+    popover.update_property(&[
+        gtk::accessible::Property::Label(
+            &format!("Tour step {} of {}: {}", index + 1, total, title)
+        ),
+    ]);
+
+    // Wire skip button
+    {
+        let pop = popover.clone();
+        skip_btn.connect_clicked(move |_| {
+            mark_tutorial_complete();
+            pop.popdown();
+            let p = pop.clone();
+            glib::idle_add_local_once(move || {
+                p.unparent();
+            });
+        });
+    }
+
+    // Wire next button
+    {
+        let pop = popover.clone();
+        let win = window.clone();
+        next_btn.connect_clicked(move |_| {
+            pop.popdown();
+            let p = pop.clone();
+            let w = win.clone();
+            glib::idle_add_local_once(move || {
+                p.unparent();
+                if is_last {
+                    mark_tutorial_complete();
+                } else {
+                    show_tour_stop(&w, index + 1);
+                }
+            });
+        });
+    }
+
+    popover.popup();
+}
+
+/// Recursively search the widget tree for a widget with the given name.
+fn find_widget_by_name(root: &gtk::Widget, name: &str) -> Option<gtk::Widget> {
+    if root.widget_name().as_str() == name {
+        return Some(root.clone());
+    }
+    let mut child = root.first_child();
+    while let Some(c) = child {
+        if let Some(found) = find_widget_by_name(&c, name) {
+            return Some(found);
+        }
+        child = c.next_sibling();
+    }
+    None
+}
+
+fn mark_tutorial_complete() {
+    let config_store = pixstrip_core::storage::ConfigStore::new();
+    if let Ok(mut cfg) = config_store.load() {
+        cfg.tutorial_complete = true;
+        let _ = config_store.save(&cfg);
+    }
+}

pixstrip-gtk/src/utils.rs

@@ -0,0 +1,11 @@
+pub fn format_size(bytes: u64) -> String {
+    if bytes < 1024 {
+        format!("{} B", bytes)
+    } else if bytes < 1024 * 1024 {
+        format!("{:.1} KB", bytes as f64 / 1024.0)
+    } else if bytes < 1024 * 1024 * 1024 {
+        format!("{:.1} MB", bytes as f64 / (1024.0 * 1024.0))
+    } else {
+        format!("{:.1} GB", bytes as f64 / (1024.0 * 1024.0 * 1024.0))
+    }
+}

pixstrip-gtk/src/welcome.rs

@@ -0,0 +1,349 @@
+use adw::prelude::*;
+
+pub fn show_welcome_if_first_launch(window: &adw::ApplicationWindow) {
+    let config = pixstrip_core::storage::ConfigStore::new();
+    if let Ok(cfg) = config.load()
+        && cfg.first_run_complete
+    {
+        return;
+    }
+
+    let dialog = build_welcome_dialog();
+    let win = window.clone();
+    let win_for_present = window.clone();
+    dialog.connect_closed(move |_| {
+        let config = pixstrip_core::storage::ConfigStore::new();
+        if let Ok(mut cfg) = config.load() {
+            cfg.first_run_complete = true;
+            let _ = config.save(&cfg);
+        }
+
+        // Launch the tutorial tour after the welcome wizard
+        crate::tutorial::show_tutorial_if_needed(&win);
+    });
+    dialog.present(Some(&win_for_present));
+}
+
+fn build_welcome_dialog() -> adw::Dialog {
+    let dialog = adw::Dialog::builder()
+        .title("Welcome to Pixstrip")
+        .content_width(500)
+        .content_height(450)
+        .build();
+
+    let nav_view = adw::NavigationView::new();
+
+    let welcome_page = build_welcome_page(&nav_view);
+    nav_view.add(&welcome_page);
+
+    let skill_page = build_skill_page(&nav_view);
+    nav_view.add(&skill_page);
+
+    let fm_page = build_file_manager_page(&nav_view);
+    nav_view.add(&fm_page);
+
+    let output_page = build_output_page(&dialog);
+    nav_view.add(&output_page);
+
+    dialog.set_child(Some(&nav_view));
+    dialog
+}
+
+fn build_welcome_page(nav_view: &adw::NavigationView) -> adw::NavigationPage {
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(24)
+        .margin_bottom(24)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    let status = adw::StatusPage::builder()
+        .title("Welcome to Pixstrip")
+        .description("A quick and powerful batch image processor.\nResize, convert, compress, strip metadata, watermark, and rename - all in a simple wizard.")
+        .icon_name("image-x-generic-symbolic")
+        .vexpand(true)
+        .build();
+
+    let next_button = gtk::Button::builder()
+        .label("Get Started")
+        .halign(gtk::Align::Center)
+        .build();
+    next_button.add_css_class("suggested-action");
+    next_button.add_css_class("pill");
+
+    let nav = nav_view.clone();
+    next_button.connect_clicked(move |_| {
+        nav.push_by_tag("skill-level");
+    });
+
+    content.append(&status);
+    content.append(&next_button);
+
+    adw::NavigationPage::builder()
+        .title("Welcome")
+        .tag("welcome")
+        .child(&content)
+        .build()
+}
+
+fn build_skill_page(nav_view: &adw::NavigationView) -> adw::NavigationPage {
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(24)
+        .margin_bottom(24)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    let title = gtk::Label::builder()
+        .label("How much detail do you want?")
+        .css_classes(["title-2"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let subtitle = gtk::Label::builder()
+        .label("You can change this anytime in Settings.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let group = adw::PreferencesGroup::new();
+
+    let simple_row = adw::ActionRow::builder()
+        .title("Simple")
+        .subtitle("Fewer options visible, great for quick tasks. Advanced options are still available behind expanders.")
+        .activatable(true)
+        .build();
+    simple_row.add_prefix(&gtk::Image::from_icon_name("emblem-ok-symbolic"));
+    let simple_check = gtk::CheckButton::new();
+    simple_check.set_active(true);
+    simple_row.add_suffix(&simple_check);
+    simple_row.set_activatable_widget(Some(&simple_check));
+
+    let detailed_row = adw::ActionRow::builder()
+        .title("Detailed")
+        .subtitle("All options visible by default. Best for power users who want full control.")
+        .activatable(true)
+        .build();
+    detailed_row.add_prefix(&gtk::Image::from_icon_name("preferences-system-symbolic"));
+    let detailed_check = gtk::CheckButton::new();
+    detailed_check.set_group(Some(&simple_check));
+    detailed_row.add_suffix(&detailed_check);
+    detailed_row.set_activatable_widget(Some(&detailed_check));
+
+    group.add(&simple_row);
+    group.add(&detailed_row);
+
+    let next_button = gtk::Button::builder()
+        .label("Continue")
+        .halign(gtk::Align::Center)
+        .build();
+    next_button.add_css_class("suggested-action");
+    next_button.add_css_class("pill");
+
+    let nav = nav_view.clone();
+    let sc = simple_check.clone();
+    next_button.connect_clicked(move |_| {
+        // Save skill level choice
+        let store = pixstrip_core::storage::ConfigStore::new();
+        if let Ok(mut cfg) = store.load() {
+            cfg.skill_level = if sc.is_active() {
+                pixstrip_core::config::SkillLevel::Simple
+            } else {
+                pixstrip_core::config::SkillLevel::Detailed
+            };
+            let _ = store.save(&cfg);
+        }
+        nav.push_by_tag("file-manager");
+    });
+
+    content.append(&title);
+    content.append(&subtitle);
+    content.append(&group);
+    content.append(&next_button);
+
+    adw::NavigationPage::builder()
+        .title("Skill Level")
+        .tag("skill-level")
+        .child(&content)
+        .build()
+}
+
+fn build_file_manager_page(nav_view: &adw::NavigationView) -> adw::NavigationPage {
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(24)
+        .margin_bottom(24)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    let title = gtk::Label::builder()
+        .label("File Manager Integration")
+        .css_classes(["title-2"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let subtitle = gtk::Label::builder()
+        .label("Add 'Process with Pixstrip' to your file manager's right-click menu.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .wrap(true)
+        .build();
+
+    let group = adw::PreferencesGroup::builder()
+        .title("Detected File Managers")
+        .description("Toggle integration for each file manager")
+        .build();
+
+    // Detect installed file managers
+    use pixstrip_core::fm_integration::FileManager;
+    let file_managers = [
+        (FileManager::Nautilus, "org.gnome.Nautilus", "system-file-manager-symbolic"),
+        (FileManager::Nemo, "org.nemo.Nemo", "system-file-manager-symbolic"),
+        (FileManager::Thunar, "thunar", "system-file-manager-symbolic"),
+        (FileManager::Dolphin, "org.kde.dolphin", "system-file-manager-symbolic"),
+    ];
+
+    let mut found_any = false;
+    for (fm, desktop_id, icon) in &file_managers {
+        let is_installed = gtk::gio::AppInfo::all()
+            .iter()
+            .any(|info| {
+                info.id()
+                    .map(|id| id.as_str().contains(desktop_id))
+                    .unwrap_or(false)
+            });
+
+        if is_installed {
+            found_any = true;
+            let already_installed = fm.is_installed();
+            let row = adw::SwitchRow::builder()
+                .title(fm.name())
+                .subtitle(format!("Add right-click menu to {}", fm.name()))
+                .active(already_installed)
+                .build();
+            row.add_prefix(&gtk::Image::from_icon_name(icon));
+
+            let fm_copy = *fm;
+            row.connect_active_notify(move |row| {
+                if row.is_active() {
+                    let _ = fm_copy.install();
+                } else {
+                    let _ = fm_copy.uninstall();
+                }
+            });
+
+            group.add(&row);
+        }
+    }
+
+    if !found_any {
+        let row = adw::ActionRow::builder()
+            .title("No supported file managers found")
+            .subtitle("You can configure this later in Settings")
+            .build();
+        row.add_prefix(&gtk::Image::from_icon_name("dialog-information-symbolic"));
+        group.add(&row);
+    }
+
+    let next_button = gtk::Button::builder()
+        .label("Continue")
+        .halign(gtk::Align::Center)
+        .build();
+    next_button.add_css_class("suggested-action");
+    next_button.add_css_class("pill");
+
+    let nav = nav_view.clone();
+    next_button.connect_clicked(move |_| {
+        nav.push_by_tag("output-location");
+    });
+
+    content.append(&title);
+    content.append(&subtitle);
+    content.append(&group);
+    content.append(&next_button);
+
+    adw::NavigationPage::builder()
+        .title("File Manager")
+        .tag("file-manager")
+        .child(&content)
+        .build()
+}
+
+fn build_output_page(dialog: &adw::Dialog) -> adw::NavigationPage {
+    let content = gtk::Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .spacing(12)
+        .margin_top(24)
+        .margin_bottom(24)
+        .margin_start(24)
+        .margin_end(24)
+        .build();
+
+    let title = gtk::Label::builder()
+        .label("Where should processed images go?")
+        .css_classes(["title-2"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let subtitle = gtk::Label::builder()
+        .label("You can change this per-batch or in Settings.")
+        .css_classes(["dim-label"])
+        .halign(gtk::Align::Start)
+        .build();
+
+    let group = adw::PreferencesGroup::new();
+
+    let subfolder_row = adw::ActionRow::builder()
+        .title("Subfolder next to originals")
+        .subtitle("Creates a 'processed' folder next to your images")
+        .activatable(true)
+        .build();
+    subfolder_row.add_prefix(&gtk::Image::from_icon_name("folder-symbolic"));
+    let subfolder_check = gtk::CheckButton::new();
+    subfolder_check.set_active(true);
+    subfolder_row.add_suffix(&subfolder_check);
+    subfolder_row.set_activatable_widget(Some(&subfolder_check));
+
+    let fixed_row = adw::ActionRow::builder()
+        .title("Fixed output folder")
+        .subtitle("Always save to the same folder")
+        .activatable(true)
+        .build();
+    fixed_row.add_prefix(&gtk::Image::from_icon_name("folder-open-symbolic"));
+    let fixed_check = gtk::CheckButton::new();
+    fixed_check.set_group(Some(&subfolder_check));
+    fixed_row.add_suffix(&fixed_check);
+    fixed_row.set_activatable_widget(Some(&fixed_check));
+
+    group.add(&subfolder_row);
+    group.add(&fixed_row);
+
+    let done_button = gtk::Button::builder()
+        .label("Start Using Pixstrip")
+        .halign(gtk::Align::Center)
+        .build();
+    done_button.add_css_class("suggested-action");
+    done_button.add_css_class("pill");
+
+    let dlg = dialog.clone();
+    done_button.connect_clicked(move |_| {
+        dlg.close();
+    });
+
+    content.append(&title);
+    content.append(&subtitle);
+    content.append(&group);
+    content.append(&done_button);
+
+    adw::NavigationPage::builder()
+        .title("Output Location")
+        .tag("output-location")
+        .child(&content)
+        .build()
+}

pixstrip-gtk/src/wizard.rs

@@ -0,0 +1,67 @@
+use crate::app::AppState;
+use crate::steps;
+
+pub struct WizardState {
+    pub current_step: usize,
+    pub total_steps: usize,
+    pub visited: Vec<bool>,
+    names: Vec<String>,
+}
+
+impl WizardState {
+    pub fn new() -> Self {
+        let names = vec![
+            "Workflow".into(),
+            "Images".into(),
+            "Resize".into(),
+            "Adjustments".into(),
+            "Convert".into(),
+            "Compress".into(),
+            "Metadata".into(),
+            "Watermark".into(),
+            "Rename".into(),
+            "Output".into(),
+        ];
+        let total = names.len();
+        let mut visited = vec![false; total];
+        visited[0] = true;
+
+        Self {
+            current_step: 0,
+            total_steps: total,
+            visited,
+            names,
+        }
+    }
+
+    pub fn step_names(&self) -> Vec<String> {
+        self.names.clone()
+    }
+
+    pub fn can_go_next(&self) -> bool {
+        self.current_step < self.total_steps - 1
+    }
+
+    pub fn can_go_back(&self) -> bool {
+        self.current_step > 0
+    }
+
+    pub fn is_last_step(&self) -> bool {
+        self.current_step == self.total_steps - 1
+    }
+}
+
+pub fn build_wizard_pages(state: &AppState) -> Vec<adw::NavigationPage> {
+    vec![
+        steps::step_workflow::build_workflow_page(state),       // 0: Workflow
+        steps::step_images::build_images_page(state),          // 1: Images
+        steps::step_resize::build_resize_page(state),          // 2: Resize
+        steps::step_adjustments::build_adjustments_page(state),// 3: Adjustments
+        steps::step_convert::build_convert_page(state),        // 4: Convert
+        steps::step_compress::build_compress_page(state),      // 5: Compress
+        steps::step_metadata::build_metadata_page(state),      // 6: Metadata
+        steps::step_watermark::build_watermark_page(state),    // 7: Watermark
+        steps::step_rename::build_rename_page(state),          // 8: Rename
+        steps::step_output::build_output_page(state),          // 9: Output
+    ]
+}