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

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

See [qoi.h](https://github.com/phoboslab/qoi/blob/master/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.

⚠️ 2021.11.30 – the file format is not yet finalized. We're still working to fix
some smaller issues. The final specification will be announced on 2021.12.20.
Thanks for your patience! https://github.com/phoboslab/qoi/issues/48

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](https://github.com/phoboslab/qoi/blob/master/qoiconv.c)
converts between png <> qoi
 - [qoibench.c](https://github.com/phoboslab/qoi/blob/master/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/zakarumych/rapid-qoi (Rust)
- https://github.com/xfmoulet/qoi (Go)
- https://github.com/panzi/jsqoi (TypeScript)
- https://github.com/pfusik/qoi-ci (Ć)
- https://github.com/kodonnell/qoi (Python)
- https://github.com/NUlliiON/QoiSharp (C#)
- https://github.com/rbino/qoix (Elixir)
- https://github.com/elihwyma/Swift-QOI (Swift)


## Packages

[AUR](https://aur.archlinux.org/pkgbase/qoi-git/) - system-wide qoi.h, qoiconv and qoibench install as split packages.