Image guides
How to Convert AVIF to BMP in Your Browser
AVIF is built for efficiency — AV1 compression, HDR color, full alpha, even animation — so converting it to BMP means giving up nearly all of that on purpose. This guide covers what the decode-and-rewrite process actually does, what specifically gets lost, and when the trade is worth making.
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How AVIF becomes BMP
- Your browser's AV1 image decoder unpacks the AVIF's compressed bitstream into a raster of pixel values — if the browser doesn't support AVIF decoding, this step fails outright rather than producing a partial result.
- Any high-bit-depth data — 10-bit or 12-bit HDR channels, which AVIF can store — is reduced to standard 8-bit-per-channel values as part of this decode, since the canvas the browser draws to only works in 8-bit. That collapse happens regardless of what format you convert the AVIF to.
- If the AVIF is animated, only the first frame in the sequence is decoded into that pixel raster.
- The resulting 8-bit RGB pixels are written into BMP's plain, uncompressed row structure, with no further processing applied.
What changes when you convert
AVIF's two headline advantages — HDR/wide color and AV1's compression efficiency — are lost in two separate places here. The HDR data is already flattened to ordinary 8-bit the moment the browser decodes it to a canvas, before BMP even enters the picture. Then BMP's total lack of compression throws away whatever file-size efficiency AVIF had achieved, so the output typically ends up many times the size of the source.
Alpha, if the AVIF had it, doesn't survive either — BMP flattens any transparency to white.
If the source was an animated AVIF, only the first frame comes through. There's no BMP equivalent of animation, so the sequence can't be reconstructed from the output afterward.
When BMP is the right choice — and when it isn't
BMP makes sense here only when something specific and old demands it — legacy Windows software or a print pipeline that won't accept anything but an uncompressed bitmap. It isn't a meaningful "safer" choice for general compatibility: most current browsers and operating systems can display AVIF directly, so the real obstacle is usually a specific older tool, not the format itself.
If broader compatibility is the actual concern, WebP is a reasonable middle ground — wider native support than AVIF while still keeping alpha and much better compression than BMP. TIFF is the better pick if you need archival fidelity with alpha preserved. Since AVIF already had the best compression of any format covered on this site, converting it to BMP is essentially never a size or quality win — it's purely a compatibility concession.
Limitations and privacy
AVIF decoding depends on your browser having AV1 image support; a browser without it will show a clear decode error rather than producing a mislabeled or broken file. Worth checking before you rely on the conversion working.
Everything happens locally — the AVIF is decoded and the BMP is written in your browser, with no upload to Looty Tools servers at any point.
Convert AVIF to BMP FAQ
- Does converting AVIF to BMP preserve HDR color?
- No. The browser reduces AVIF's high-bit-depth HDR data to standard 8-bit color during decoding, before the BMP is even written — this happens regardless of the target format.
- Why is BMP so much larger than the AVIF source?
- AVIF uses AV1 compression, currently among the most efficient image compression available. BMP applies none at all, so removing that compression is what inflates the file size, often dramatically.
- Will an animated AVIF still animate after converting to BMP?
- No. Only the first frame is decoded and converted; BMP has no format-level concept of multiple frames or animation.
- My browser won't convert my AVIF file — why?
- AVIF decoding relies on your browser's built-in AV1 support. If that support is missing, the conversion fails at the decode step with a clear error rather than producing a bad file.
- Is the AVIF file uploaded anywhere during conversion?
- No. Conversion runs entirely in your browser and the file is never sent to Looty Tools servers.
