Convert BMP to AVIF
Free · no signup · no watermark · nothing is stored · batch up to 20 files
Drop your BMP files here
or click to choose — up to 20 at once
Select BMP fileHigher keeps more detail and makes larger files. 80 to 90 is the range most people cannot tell from the original.
AVIF has to be written on our server, so the file is uploaded, converted in memory and sent straight back. It is never written to disk and never stored. Need test files? Try our free sample files.
This free BMP to AVIF converter turns your .bmp images into .avif files. BMP turns up from legacy Windows software and scanners. It stores raw uncompressed pixels, so files are enormous for what they contain.
Because browsers cannot write AVIF, this one runs on our server: the file is converted in memory and sent straight back. It is never written to disk, never logged and never stored.
How to convert BMP to AVIF
- Drop your BMP files onto the box above, or click it to choose from your computer. Up to 20 at once.
- Set the quality if you want to trade size against detail. 85 is a good default; below about 70 the loss starts to be visible.
- Download each converted file, or pick them up one by one from the list.
What changes when you convert BMP to AVIF
BMP is lossless and AVIF is not, so this conversion discards some image data permanently. At quality 85 the difference is invisible for photographs; for screenshots, text and line art it shows as faint haloing around edges.
BMP and AVIF compared
| BMP | AVIF | |
|---|---|---|
| Full name | Windows Bitmap | AV1 Image File Format |
| Extension | .bmp | .avif |
| MIME type | image/bmp | image/avif |
| Compression | Lossless | Lossy |
| Transparency | No | Yes |
BMP: Uncompressed raw pixels, which makes the files enormous and the format trivial to parse. Mostly encountered coming out of legacy Windows software and scanners.
AVIF: Built on the AV1 video codec, typically half the size of JPG at the same quality, with transparency and wide colour. Browsers can display it, but almost no desktop software can open or edit it, which is why converting out of AVIF is such a common need.
Frequently asked questions
How do I convert BMP to AVIF?
Drop your .bmp file onto the box on this page and the .avif file is ready to download in a second or two. There is no signup, no email, no watermark and no file limit beyond about 4 MB per upload — larger images are re-encoded smaller in your browser first, and the page says so when that happens.
Is this BMP to AVIF converter free?
Yes, completely, with no account, no trial and no watermark on the output. We are a consultancy and these tools exist because we needed them ourselves; there is nothing to buy on this page.
Are my files uploaded anywhere?
This one has to run on our server, because browsers cannot write AVIF. The file is converted in memory and returned immediately — it is never written to disk, never logged and never stored. If that is not acceptable for your file, use a desktop tool instead.
Will converting to AVIF reduce the quality?
BMP is lossless and AVIF is not, so this conversion discards some image data permanently. At quality 85 the difference is invisible for photographs; for screenshots, text and line art it shows as faint haloing around edges.
Can I convert several BMP files at once?
Yes, up to 20 files in one go. Drop them all onto the box together and each one appears in the results list with its own download button.
Found a problem, or something that could be better? We read every message and we fix things quickly.
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