Convert BMP files directly into AVIF in your browser. 100% private WebAssembly processing, no uploads required.
Output format
BMP files are converted to AVIF entirely on your device. Your images are never uploaded to a server.
Add many BMP files at once and convert them all in a single click. Each file has its own progress indicator and status, and you can download everything as a ZIP at the end.
No estimated savings — the actual output bytes are shown, so the percentage saved you see is what you actually get.
For lossy AVIF output a 1–100 quality slider trades size against visual quality. The tradeoff is explained inline.
AVIF (AV1 Image File Format) is a modern format based on the AV1 video codec. It offers excellent compression for both photographic and synthetic imagery, supports transparency, and is supported by all major modern browsers.
AVIF offers better compression than BMP in most cases, supports transparency, and is well-supported on modern browsers.
AVIF supports alpha transparency, so transparent regions in your source image are preserved in the converted file.
Usually yes — AVIF typically offers the best compression of the supported formats, sometimes 50% smaller than JPEG at similar visual quality. Encoding is slower than other formats.
No. Files processing is secure and safe — your images are processed locally in your browser and never uploaded.
Yes. Drag in as many files as you want, click Convert All, and download the results individually or as a ZIP.
Yes. The interface is responsive and touch-friendly, and conversion runs on modern mobile browsers.