kadr

Fast, minimal image and video viewer built with Rust and egui.

Features

• Images: JPEG, PNG, GIF, WebP, BMP, TIFF, AVIF, HEIC, ICO and more
• RAW: CR2, CR3, NEF, ARW, DNG, ORF, RAF and other common RAW formats
• Video: MP4, MKV, AVI, MOV, WebM and more (in-app playback via libmpv, installed alongside kadr)
• Thumbnail strip with lazy loading
• Folder and file scanning with optional subfolder traversal
• Sort by name, date, or size
• Zoom, pan, rotate, flip — all non-destructive except explicit save
• Slideshow with configurable interval, random order, and Lua scripting
• Combine folders utility
• Right-click context menu integration (optional, set via installer)
• Configurable keyboard shortcuts
• Multi-monitor support — choose which monitor to open on
• Drag-and-drop to open files and folders

Default keyboard shortcuts

Key	Action
Arrow Right / Arrow Left	Next / previous image
Space	Toggle zoom (fit / 100 %)
+ / -	Zoom in / out
0	Reset zoom
Arrow Up/Down/Left/Right	Pan (when zoomed in)
R	Rotate 90° clockwise
Shift+R	Rotate 90° counter-clockwise
H	Flip horizontal
V	Flip vertical
F11	Toggle fullscreen
T	Toggle thumbnail strip
S	Toggle slideshow
Delete	Delete current file
Ctrl+O	Open folder
Ctrl+Shift+O	Open file
Ctrl+E	Combine folders
Ctrl+,	Settings
Ctrl+Q	Quit

Video shortcuts (when a video is the current entry)

Key	Action
Space	Play / pause
Arrow Left	Seek back 10 s
Arrow Right	Seek forward 10 s
Arrow Up	Volume +10 %
Arrow Down	Volume -10 %
PageUp / PageDown	Previous / next file in folder

All shortcuts are re-bindable from Settings (Ctrl+,).

Building

Prerequisites: Rust 1.85+ (2024 edition), Windows SDK.

# Build kadr only
cargo build --release -p kadr

# The binary is at target/release/kadr.exe

Configuration

Config is stored at %APPDATA%\kadr\config.toml and is written automatically on exit.