Convert PNG images to QOI locally - lossless and blazing fast, right in the browser, no upload.
Running locally on your device ...
Running locally on your device ...
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No re-upload neededThese tools accept .QOI - your file is handed over directly.
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.
Honest about size: QOI compresses more simply than PNG and therefore usually yields a slightly larger file than an optimized PNG - the gain is not in size but in speed. QOI has no compression levels and no metadata chunks; it encodes in a single linear pass, which is what makes it so fast for tools and game engines.
| Input formats | PNG |
|---|---|
| Auto-conversion | JPG, WebP, GIF, BMP, TIFF, ICO, SVG, HEIC, PDF, DOCX, DDS, HDR, PCX, WBMP |
| 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. Embedded metadata such as capture date, camera and GPS location does not survive the re-encode - only the image orientation is baked into the pixels beforehand.
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.
QOI to PNG · PNG to WebP · PNG to JPG · HEIC to WebP · HEIC to AVIF · JPG to WebP