BMP to AVIF Converter

Bitmap Image File (BMP) is a uncompressed image format used for legacy windows assets, screenshots from old tools and lossless pixel dumps. Files saved as BMP usually come from Microsoft / IBM. Before converting, check that the source is the highest-quality copy you have, because every later step can only preserve what is already there.

The target is AV1 Image File Format (AVIF), a lossy image format chosen for highly compressed modern images and complex photos. You are moving from a lossless source to a lossy encoder, which usually cuts the file size sharply but permanently discards fine detail. The output keeps the original dimensions or sample rate unless you change them, so this step changes the encoding rather than the content.

AVIF uses AV1 intra-frame coding, the smallest option for photographic detail, but encoding is slower and older viewers cannot open it. The output format supports transparency, yet the source has no alpha data, so the extra channel stays fully opaque. Expect a smaller output file, which is usually the reason to pick AVIF.

This conversion runs locally in your browser tab through Canvas or FFmpeg.wasm. The file is read from your device, decoded, re-encoded and handed back as a download; it is not uploaded to a conversion server. That keeps private recordings, client material and unreleased artwork off shared infrastructure.

After the download, play or open the result before deleting the original. Check the first and last seconds, confirm that transparency, rotation metadata or sample rate survived, and compare file sizes. If something looks wrong, retry with a higher quality setting rather than converting the output again.