Unterlumen runs as a local web server and lets you browse your photo library right in your browser. View images full-screen, organize files using a dual-pane file manager, and cull your shots — all without uploading anything anywhere.
Everything you need
Powerful features, beautifully simple.
Browse Your Way
Justified grid, list, or full-screen — switch views instantly and find the shot you're looking for.
Full-Screen Viewer
Dive into every detail. Navigate with your keyboard, see EXIF data at a glance, flip through your film strip.
Commander File Manager
Dual-pane power. Copy, move, and organize across folders like a pro — no Finder gymnastics.
Smart Waste Bin
Mark, review, restore. Delete with confidence — nothing disappears until you say so.
Batch Rename
Rename hundreds of files with EXIF-based patterns. Live preview, conflict detection, one click.
Pin It on the Map
Set or fix GPS coordinates on an interactive map. Your photos, properly placed.
All the Metadata
EXIF, orientation, Fujifilm film simulation badges — every detail your camera captured, surfaced.
Every Format Welcome
JPEG, PNG, GIF, WebP out of the box. HEIF and HEIC with ffmpeg. Retina-quality thumbnails.
Convert & Export
Convert and export your images to different formats in one step — right from the browser, no external tools needed.
See it in action
Every view you need, one click away.
Get started in seconds
Download the binary or run the container — point at your photos, done.
./unterlumen ~/Photos
Available for Linux, macOS (Intel & Apple Silicon), and Windows. Requires Go 1.21+ only when building from source. Optional: ffmpeg for HEIF files, exiftool for geolocation and batch rename.
Or run with Docker — ffmpeg and exiftool included:
docker run -p 8080:8080 -v /path/to/photos:/photos ghcr.io/blazko/unterlumen:latest
The container runs in server mode. Navigation is locked to /photos, and the server listens on port 8080.
Use at your own risk. Always back up your files before use — especially when moving, renaming, or deleting.