keen

Local image converter and compressor. CLI + Tauri desktop app.

Features

• Convert between PNG, JPEG, GIF, BMP, TIFF, WebP
• Batch convert entire directories
• Resize with width/height constraints
• Adjust JPEG/WebP quality
• Strip EXIF metadata
• Automatic EXIF orientation correction
• Concurrent batch processing

Installation

CLI

go install github.com/oreoluwa-bs/keen/cmd/keen@latest

Or download a binary from GitHub Releases.

Desktop

Download the .dmg (macOS) or .AppImage (Linux) from GitHub Releases.

Usage

# Convert a single file
keen convert input.png output.jpg

# Convert with quality
keen convert --quality 80 input.png output.jpg

# Convert and resize
keen convert --width 800 input.heic output.jpg

# Batch convert a directory
keen batch --format webp --quality 80 ./photos ./converted

# Strip EXIF metadata (orientation still preserved by default)
keen convert --strip-exif input.jpg output.png

# Batch with multiple workers
keen batch --format jpeg --workers 8 ./raw ./processed

Supported input formats

PNG, JPEG, GIF, BMP, TIFF, WebP + any format Go's image decoder supports (including HEIC via platform decoders).

Supported output formats

PNG, JPEG, GIF, BMP, TIFF, WebP

Building from source

make build

Binary is written to ./keen.

Desktop app

cd desktop
pnpm install
pnpm tauri dev

See CONTRIBUTING.md for development setup and RELEASING.md for release process.