QOI (Quite OK Image Format)
.qoi · image/qoi · 2021 · Dominic Szablewski
A tiny, blazing-fast lossless format loved by game developers. Below is what QOI is best at, where it falls short, and how it compares — plus free, in-browser tools to convert QOI to and from other formats, with nothing uploaded.
QOI is a deliberately simple lossless format from 2021 — the entire specification fits on one page. It compresses to sizes comparable with PNG but encodes ~20–50× faster and decodes ~3–4× faster, which made it popular in game development and creative coding. Browsers do not display QOI natively, so convert to PNG or WebP for web use.
Compression
Lossless
Transparency
Yes
Animation
No
Browser display
None
Strengths & limitations
Strengths
- Extremely fast lossless encode/decode
- One-page spec, easy to implement anywhere
- PNG-class compression with alpha support
Limitations
- No browser or mainstream app support
- No metadata, color profiles, or animation
- 8-bit RGBA only
Best used for
- Game asset pipelines
- Fast intermediate storage
- Embedded and hobby projects
Tools for QOI
Frequently asked questions
Is QOI lossy or lossless?+
QOI is lossless: it preserves every pixel exactly, with no quality loss.
Does QOI support transparency?+
Yes — QOI has an alpha channel, so it can store transparent areas. It is a still-image format (no animation).
Can browsers open QOI files directly?+
No — browsers can't display QOI in a page. Convert it to JPG or PNG first, which you can do here with nothing uploaded.
How do I open or convert a QOI file for free?+
Drop your QOI file into the EditItAll converter and choose an output format — it decodes and re-encodes entirely in your browser, with nothing uploaded, no account and no watermark.