Why pick AVIF over WebP for BMPs?
For photographic BMPs AVIF beats WebP by another 10–25% at the same perceived quality. For synthetic content (UI captures, diagrams) the gap narrows, but AVIF still tends to win.
The trade-off is encoding speed (AVIF is slower than WebP) and slightly lower browser support, though >90% of global traffic handles AVIF natively today.
When BMP is worth converting
BMP is essentially an archive of pixels with zero compression — typical files are 10–100x larger than they need to be for delivery on the web. Converting to AVIF (or WebP if you want maximum compatibility) is one of the highest-impact size optimisations you can make.
How the converter works
- Drop or select one or more BMP files (up to 20 MB each).
- We decode with libvips and re-encode using libaom (quality 60, encode speed 6).
- Download the AVIF ready for production.
Domande frequenti
Compared to the original BMP, typical savings are 95%+ for photographs and 80%+ for synthetic content like screenshots.
Yes, Safari 16.4+ supports AVIF. For older versions use a <picture> fallback to WebP or JPG.
Yes — drop multiple BMPs and receive a ZIP of AVIFs. Anonymous users: 10 per batch. Registered: up to 100.
No. 25 free conversions per day without an account; more with a free signup.