Convert BMP and bitmap images to AVIF directly in your browser. Get the smallest modern format for web use from large uncompressed BMP files.
Last updated: August 2026
AVIF
Modern Format
60-95
Quality Control
Batch
Multiple Files
Private
No Uploads
Drop BMP files here or click to browse
Supports .bmp and .dib, all processing stays in your browser
AVIF encoding is slower than JPEG or WebP. Large files or batches may take a little longer, all processing happens in your browser.
Drop or select your BMP file
One file or many, .bmp or .dib. Nothing is uploaded.
Set the AVIF quality
Defaults to 85. Set it before adding files, already-added files keep their quality.
Conversion starts automatically
Each file decodes and re-encodes as AVIF the moment it's added.
Download your AVIF
One file downloads directly, two or more can download together as a ZIP.
AVIF is the right choice when file size matters most and the destination supports modern formats.
Large uncompressed BMP scans
Scanned photo BMP files are often very large since BMP rarely compresses. AVIF gives the biggest practical reduction.
Legacy bitmap archives for the web
Publishing a folder of old BMP files online becomes far more practical once each file is converted to AVIF.
Maximizing page speed
Replacing large BMP or JPEG files with AVIF reduces page weight more than most other widely available format choices.
Photographic content with rich detail
AVIF's advantage is most pronounced on detailed photographic images, exactly the kind of content often stored as BMP.
Adjusting quality after files are already added
The quality slider only applies to files added after you move it. If you want a different quality on a file that's already converting, remove it and drop it in again once the slider is set.
Expecting a batch to finish instantly
AVIF encoding is slower than JPEG or WebP. A batch of several large BMP files can take noticeably longer, that's normal, not a stall.
Trying to drop a non-BMP file
This tool only accepts .bmp and .dib files. Other formats need a different converter on this site first.
Assuming AVIF is always the right output
AVIF gives the smallest files, but for guaranteed compatibility with older software or very old browsers, JPEG or WebP are the safer fallback.
AVIF is the most efficient widely supported format for photographic content, typically producing files around 50 percent smaller than an equivalent JPEG and noticeably smaller than WebP at the same visual quality. Since BMP files are usually uncompressed, converting straight to AVIF gives the largest possible reduction in file size for a photo or scanned image originally saved as BMP.
Yes. AVIF support is now near universal across Chrome, Firefox, Safari and Edge, and Google's PageSpeed Insights recommends it as a preferred format for web images. For situations needing guaranteed compatibility with very old browsers or software, WebP or JPEG remain safer fallback choices, but AVIF is the strongest default for most modern audiences.
Yes, AVIF encoding is more computationally intensive and can take noticeably longer than JPEG or WebP, especially for large BMP source files. This happens entirely in your browser using WebAssembly, so there is no upload wait, only the local encoding time itself.
85, the default, is a good balance for most images. The slider runs from 60 to 95. Lower toward 70 to 75 for the smallest files when serving web images, or raise toward 90 to 95 when preserving fine detail matters more than file size.
No. Quality is applied at the moment a file starts converting, which happens as soon as it's added. Changing the slider only affects files added after that point. To apply a different quality to a file already in the list, remove it and drop it in again after adjusting the slider.
BMP files virtually never carry EXIF metadata in the first place, it's not a format feature BMP typically supports the way JPEG does. So there's generally nothing to strip. The conversion still decodes to raw pixels and re-encodes as AVIF, so even in the rare case a BMP-wrapping tool embedded extra data, it would not carry over.
Yes. Drop or select several BMP files and each converts independently. With a single finished file, the download button saves it directly. Once two or more files finish, you get the option to download them all together as one ZIP archive.
No. Both the decoding and the AVIF encoding happen entirely in your browser using a custom BMP decoder and WebAssembly. Your file never leaves your device at any point during the conversion.
No sign-up. No upload to server. Drop your BMP file above and download the AVIF in seconds.
