QOI - The “Quite OK Image” format for fast, lossless image compression

Single-file MIT licensed library for C/C++

See qoi.h for the documentation.

More info at https://phoboslab.org/log/2021/11/qoi-fast-lossless-image-compression

⚠️ Please note that this library is not yet ready to deal with untrusted input.

⚠️ 2021.11.27 – the specification for QOI has changed to accomodate some concerns with the format. If you are working on a QOI implementation, please refer to #37 The QOI File Format Specification for the details.

These specification changes are not yet reflected in the code here reflected in qoi.h now.

Why?

Compared to stb_image and stb_image_write QOI offers 20x-50x faster encoding, 3x-4x faster decoding and 20% better compression. It's also stupidly simple and fits in about 300 lines of C.

Example Usage

• qoiconv.c converts between png <> qoi
• qoibench.c a simple wrapper to benchmark stbi, libpng and qoi

Tools

• https://github.com/floooh/qoiview

Implementations of QOI

• https://github.com/MasterQ32/zig-qoi (Zig)
• https://github.com/steven-joruk/qoi (Rust)
• https://github.com/ChevyRay/qoi_rs (Rust)
• https://github.com/xfmoulet/qoi (Go)
• https://github.com/panzi/jsqoi (TypeScript)
• https://github.com/pfusik/qoi-ci (Ć)

Packages

AUR - system-wide qoi.h, qoiconv and qoibench install as split packages.