Browse folders continuously
Open a folder, get an image queue, and move through thousands of files with the keyboard. Thumbnails and previews are generated in the background.
Open source · GPL-3.0 · Local-first
Image viewing should be
fast, quiet, and clean.
Open a folder and browse continuously. Compare up to 4 images side by side, remove GPS and device metadata, batch rename, and convert formats. Everything runs locally, and Folio exports new files by default instead of overwriting originals.
- 10View formats · including HEIC and JPEG XL
- 0Uploads · data stays on your device
- 4Images side by side · grouped browsing
Why Folio
A lightweight viewer with the tools photographers actually need.
System viewers are limited. Pro suites are heavy. Folio sits in the middle: fast browsing with practical local tools built in.
Inspect and clean Exif
View Exif, XMP, IPTC, GPS, and MakerNotes fields. Remove privacy-sensitive metadata by preset or field and export a clean copy.
Compare multiple images
Use 2-up, 3-up, or 4-up layouts and step through image groups. Picking, checking sharpness, and comparing variants becomes much faster.
Batch rename safely
Replace, delete, sequence, or use MD5/SHA1 templates. Dry-run previews catch duplicates, illegal names, and collisions before execution.
Convert formats
Output JPEG, PNG, WebP, AVIF, or TIFF with format-specific options. On macOS, HEIC, HEIF, JPEG XL, and BMP can be used as inputs.
Save to target folders
Copy files to selected folders with naming rules and conflict policies. Folio copies files instead of moving or modifying originals.
Format support
Common formats open directly. Modern formats use cached previews.
Folio detects real formats from file headers instead of trusting extensions. Formats Chromium cannot decode directly are converted into safe lightweight previews in the main process.
Viewing / preview
Conversion output
Windows note: HEIC, HEIF, and JPEG XL preview and conversion are not supported in the current Windows build.
Privacy is the default
Clean traces before sharing.
GPS coordinates, device serial numbers, capture time, and software metadata can leak more than expected. Folio makes cleanup a normal part of browsing, with conservative safety rules:
- Local-firstNo uploads, no Exif collection, and no scanning folders you did not choose.
- No original overwrite by defaultMetadata cleanup, conversion, and save workflows export new files unless you explicitly choose otherwise.
- Traceable batch workPreview, confirm, and keep logs. Failures do not delete or damage originals.
- Auto modeApply a cleanup rule while browsing and export clean copies for the current session.
Remove metadataPreset: Privacy
Export new file
Clean and export
Turning off export-new overwrites in place and requires another confirmation.
Differentiator
Four images on one screen. Faster picks, clearer comparisons.
Find the sharpest frame in a burst, compare variants, or choose a cover image. Side-by-side viewing makes differences visible at a glance.
Sample images from microsoft.design/wallpapers
Keyboard-first
Move through a folder without leaving the keyboard.
←→
Previous / next image
Space
Toggle fit / actual size
T
Quick-save the focused image
I
Open / close the Exif drawer
F11
Immersive fullscreen
234
Switch multi-view layout
Free · Open source · GPL-3.0
Start browsing with Folio.
Download from GitHub Releases. Your images stay yours. The source is public, and issues and contributions are welcome.
Downloads open GitHub Releases · MVP preview build · tested on macOS 26 and Windows 11
Homulilly/folio
View source · follow updates · contribute →
Or build from source
git clone https://github.com/Homulilly/folio.git