Convert QOI images to PNG locally - lossless, 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 deliberately minimalist, lossless image format: its algorithm gets by with a handful of simple rules and is therefore extremely fast to both encode and decode. It is popular in game development and in tools as a lean intermediate format, yet image viewers, print shops and websites rarely support it directly. PNG solves exactly that compatibility problem: also lossless, with transparency and readable almost everywhere.
This tool decodes QOI with its own dependency-free decoder entirely locally in your browser and exports a PNG via the native canvas. Because QOI and PNG are both lossless, no image information is lost - the pixels stay exactly the same.
The whole conversion happens with no upload, even offline. Your images never leave your device. Transparency (the alpha channel) is preserved.
| Input formats | QOI |
|---|---|
| Output format | PNG |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Expects valid QOI files (magic "qoif"); other files are honestly rejected. The result is lossless and keeps the dimensions and transparency.
No. QOI is decoded entirely locally in the browser.
Yes. QOI and PNG are both lossless; the pixels stay exactly the same.
A very simple, lossless image format (Quite OK Image) that is especially fast to encode and decode.
Yes. The alpha channel is carried over when converting to PNG.