Yes, with no account, no watermark and no per-file limit.

Are my files uploaded?

No. The conversion runs entirely in your browser and the file never leaves your device.

Convert QOI to BMP

BMP is uncompressed and predictable — useful for legacy or industrial software, but the files are large. Everything happens locally: QOI files are decoded by your browser and written back out as BMP without ever touching a server.

Checking your browser's codec support…

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Drop your QOI files here or

Batch supported · files never leave your device

Output format Quality 92%

What is QOI?

A modern lossless image format published in 2021. It compresses far faster than PNG while producing files of comparable size.

Why convert QOI to BMP?

BMP is uncompressed and predictable — useful for legacy or industrial software, but the files are large.

Almost nothing opens a .qoi file — not browsers, not Photoshop, not your phone. Converting to PNG makes it usable while staying perfectly lossless.

How this converter handles QOI

Full decoder for the QOI spec: RGB, RGBA, index, diff, luma and run chunks. We can also output QOI, which very few web tools offer.

Why the conversion happens on your device

This page is a static file. There is no upload endpoint, no queue and no server-side conversion step — the work is done by JavaScript running in your own browser. That has three practical consequences:

Nothing is transmitted. Open your browser's network panel and confirm it yourself.
No file size limit. Server-based converters cap uploads and throttle repeat use. Your machine has no such quota.
No queue. Conversion starts immediately and runs at local speed.

Frequently asked questions

Is this really free?: Yes, with no account, no watermark and no per-file limit. There is no server cost to recover because no server is involved.
Are my files uploaded?: No. The page has no backend to upload to. You can verify this in your browser's developer tools, or by loading the page and disconnecting from the internet before converting.
Does converting QOI to BMP lose quality?: No. BMP is lossless, so the pixels are preserved exactly. The file may be larger or smaller than the original, but it will look identical.
Can I convert many files at once?: Yes — drop a batch and they are processed one after another.
What if my browser cannot decode QOI?: For formats browsers do not support natively (TGA, QOI, PPM/PGM/PBM, farbfeld, BMP, ICO) FormatAtlas ships its own decoder, so support does not depend on your browser version.