The Quite OK Image Format for
Fast, Lossless Compression

QOI is fast. It losslessly compresses images to a similar size of PNG, while offering 20x-50x faster encoding and 3x-4x faster decoding.

QOI is simple. The reference en-/decoder fits in about 300 lines of C. The file format specification is a single page PDF.

A list of tools, implementations and software supporting QOI can be found in the README on Github.

The QOI-Logo (framed version) and the specification pdf are released as public domain under the CC0 License and may be freely used.