Reddit Image Gallery Downloader

WHAT IT DOES

Reddit Image Gallery Downloader is a browser extension that automatically scans the current Reddit page for image galleries, gallery posts, and image containers. It detects gallery elements by examining class names, IDs, and data attributes for patterns like ".gallery", ".image-gallery", ".gallery-grid", and related selectors. The extension adds a floating download button (🖼️) next to the gallery, providing quick access to download controls with an image count indicator. Clicking the button opens a panel where you can download all images from a gallery, select specific images, choose download format (individual or all sequentially), and store download history locally. The panel displays the post title, image count, and thumbnail previews of the gallery images. You can download all images individually with automatic naming, and the extension tracks download history per post. The extension maintains an image download database per post with download history, notes, and tags. The main panel shows download history with timestamps, image counts, and notes. All data is stored locally in your browser using GM_setValue, ensuring your download history persists across page reloads and browser sessions. This helps Reddit users who want to save entire image galleries from posts for offline viewing, reference, or collection purposes.

WHERE IT RUNS

This extension runs on any Reddit page that displays image galleries, gallery posts, or image containers – including Reddit post pages, gallery posts, and any page with multiple images. The extension intelligently adapts to different page structures and supports a wide range of common Reddit display patterns. No manual configuration is required per site; the extension automatically detects gallery elements using a flexible pattern matching system. This makes it ideal for Reddit users who want to download image galleries from posts.

HOW TO USE

Simply install the extension and navigate to any Reddit page with an image gallery. The extension automatically detects gallery images and shows a download button (🖼️) next to the gallery with an image count indicator. Click the button to open the gallery download panel. The panel shows the post title, image count, and thumbnail previews of all images. Select your download format from "Download individually" or "Download all (one by one)". Click "Download All Images" to start downloading – images are saved with automatic filenames (reddit_1.jpg, reddit_2.jpg, etc.) with a delay between downloads to avoid issues. A floating button (📷) appears in the bottom-right corner of the page – click this to open the panel from anywhere. Use the notes section to add notes about the gallery content or collection. The panel also shows your download history with timestamps and image counts. Use the "Clear All Data" button to remove all tracking data when needed.

ONE TECHNICAL SECTION – WHY IT WORKS

The extension uses DOM traversal and image extraction to identify and download gallery images. The detection system uses a comprehensive set of CSS selectors targeting gallery containers including ".gallery", ".image-gallery", and related patterns. For each gallery element, the extension extracts image sources from img tags, data-src attributes, and data-url attributes. The extension attempts to get high-resolution versions by replacing thumbnail-specific URL patterns (thumbnail, thumb, small, medium) with "original". The extension also searches for images in post content (usertext-body, md) when no gallery container is found. Image downloads are handled via GM_xmlhttpRequest with blob response type, creating downloadable object URLs. The extension includes a fallback that opens images in new tabs if the download request fails. Download history is stored with post URL, title, image count, image URLs, download date, format, notes, and tags. A MutationObserver detects dynamic content updates and re-scans only when new gallery elements appear, balancing real-time accuracy with system performance.

THE PANEL – DRAG / PER-SITE POSITION / SNAP / COLLAPSE / RESIZE / ESCAPE

The gallery download panel includes a draggable title bar, allowing you to position it anywhere on screen for convenient access during browsing. The extension remembers your preferred position per website, so the panel opens in the same location each time you return to that domain. The panel supports snap-to-edge behavior – when dragged near screen edges, it gently snaps into place for a tidy workspace layout. You can collapse the panel down to just its title bar by clicking the collapse button, keeping it accessible without taking up screen space. The gallery preview and download controls are contained within a scrollable body, ensuring all content remains accessible even on smaller screens. Pressing the Escape key closes the panel instantly, returning you to your Reddit browsing workflow.

PLEASE NOTE

This extension requires the free BotGentz extension to be installed and enabled, as it relies on BotGentz's userscript injection and GM_* API shims for cross-browser compatibility. Websites frequently update their HTML structures and class names, which may cause gallery detection to break temporarily – we actively maintain the matching patterns and release updates regularly. The extension stores all gallery data, download history, notes, and tags exclusively in your local browser storage (GM_setValue); no data is ever transmitted to any external server or third party. The extension does not read, modify, or interfere with any Reddit content or functionality beyond the gallery display – it operates on the page content and stores only metadata (post URLs, titles, image URLs, download dates, and notes) that you explicitly create. You are responsible for backing up your download history data if you switch browsers or clear your storage. Use this tool responsibly and in accordance with Reddit's Terms of Service and the rights of content creators.