I built slimg, a CLI tool for image optimization written in Rust. It handles format conversion, compression, resizing, cropping, and extending (adding padding) — with batch processing support.

Codecs: MozJPEG, OxiPNG (Zopfli), libwebp, AVIF (ravif/dav1d), QOI, JPEG XL (decode-only).

## Example usage:

slimg convert photos/ --format webp --output out/ --recursive --jobs 4

slimg optimize photo.jpg --quality 70

slimg resize photo.jpg --width 800

slimg crop photo.jpg --aspect 16:9

Beyond the CLI, the core library (slimg-core) is on crates.io, and I also built language bindings via UniFFI:

  - Kotlin/JVM (Maven Central): fluent API for server-side image processing


  - Python (PyPI): for scripting and pipeline integration

cargo install slimg

brew install clroot/tap/slimg

pip install slimg

All five platforms supported (macOS/Linux/Windows, x86_64/ARM64).

GitHub: https://github.com/clroot/slimg