Convert PNG images to QOI locally - lossless and blazing fast, right in the browser, no upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
QOI (Quite OK Image) is a lossless image format that gets by with just a few simple rules and is therefore extremely fast to encode and decode. It is popular for game assets, editors and intermediate formats because, without complex entropy compression, it produces surprisingly small files - comparable to PNG, but with a markedly leaner algorithm.
This tool reads your PNG via the native canvas and encodes it with its own dependency-free QOI encoder entirely locally in your browser. The encoder follows the official QOI specification, so the file is compatible with other QOI tools.
Because QOI and PNG are both lossless, no image information is lost; transparency is preserved. The whole conversion happens with no upload, even offline - your images never leave your device.
| Input formats | PNG |
|---|---|
| Output format | QOI |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Reads any browser-decodable PNG and encodes losslessly to QOI (RGBA, sRGB). Very large images need correspondingly more memory. Other files are honestly rejected.
No. The PNG is read locally and QOI is encoded locally - nothing is uploaded.
Yes. QOI, like PNG, is lossless; the pixels stay exactly the same.
Yes. The encoder follows the official QOI specification (magic "qoif", standard chunks).
Yes. QOI stores the alpha channel; transparency is carried over.