Convert BMP to AVIF
Turn BMP images into compact AVIF images for modern websites. Everything happens in your browser, so your images never leave your device.
Why convert BMP to AVIF?
BMP files are usually uncompressed, so they're far larger than they need to be and awkward to share. AVIF usually gives the smallest files of any common format at a given quality, which helps page speed.
The background stays as it is
BMP has no transparency, so the AVIF keeps the same solid background. AVIF supports transparency, but a converter can't tell which pixels are "background". To get a transparent AVIF, remove the background in an editor first.
File size and quality
AVIF is lossy: it drops detail the eye is unlikely to notice in exchange for much smaller files. Because BMP is usually uncompressed, the AVIF is often a tiny fraction of the original size. Sharp edges and text can pick up faint artefacts. You can set the AVIF quality before converting; the default of 90% keeps differences hard to spot.
BMP and AVIF compared
| Property | BMP | AVIF |
|---|---|---|
| Compression | Usually uncompressed | Lossy or lossless |
| Transparency | No | Yes |
| Animation | No | Yes (rarely used) |
| Typical file size | Very large | Very small |
| Best for | Legacy and embedded software | Web images where size matters most |
| Support | Desktop apps; rare on the web | Modern browsers; limited in apps |
Questions
Will converting BMP to AVIF make the background transparent?
No. BMP has no transparency, so the AVIF keeps the same solid background. Remove the background in an editor first if you need a transparent AVIF.
Will converting BMP to AVIF reduce quality?
Slightly. AVIF is lossy, so very fine detail and sharp edges can soften a little in exchange for a much smaller file. Raise the quality setting if you see artefacts around text or edges.
Can everyone open AVIF files?
Chrome, Edge, Firefox and Safari (version 16 and later) display AVIF. Outside the browser support is patchy: Windows needs the free AV1 Video Extension, and many editors and upload forms don't accept it yet.
Are my BMP images uploaded anywhere?
No. The conversion runs in your browser, on your own device, so your images are never sent to a server. Once the page and converter have loaded, it keeps working even if your connection drops.