Converting BMP to AVIF produces the smallest possible modern image file from uncompressed source data. AVIF typically cuts BMP size by 50–100× while supporting full alpha, HDR, and wide color.
Drag & drop image files here, or browse
Drop your BMP files here
Encoding is much slower than WebP or JPG; expect seconds per large image. Lossy AVIF at high quality is indistinguishable from the BMP source; lossless AVIF preserves exact pixels. Alpha transfers cleanly.
AVIF works in Chrome 85+, Firefox 93+, Safari 16+, modern Edge, macOS, and iOS. Image editor support is improving.
BMP is the uncompressed Windows bitmap format from 1990. Files are huge because almost nothing is compressed, but the format is trivial to decode and supported by virtually every Windows utility, embedded system, and legacy tool. Useful as an interchange format when other options fail.
AVIF is an image format built on the AV1 video codec, standardized in 2019. It supports HDR, wide color gamut, 12-bit depth, alpha, and animation. At matched perceived quality it's typically 50% the size of JPG and 20% smaller than WebP. Support is near-universal in modern browsers but spottier in image editors.
Typically 50–100× smaller than BMP. AVIF is the most efficient mainstream image format; BMP is uncompressed.
Lossless for flat-color content where pixels matter exactly. Lossy (quality 60+) for photographs where smaller files are worth imperceptible quality loss.
BMP is the uncompressed Windows bitmap format from 1990. Files are huge because almost nothing is compressed, but the format is trivial to decode and supported by virtually every Windows utility, embedded system, and legacy tool. Useful as an interchange format when other options fail.
AVIF is an image format built on the AV1 video codec, standardized in 2019. It supports HDR, wide color gamut, 12-bit depth, alpha, and animation. At matched perceived quality it's typically 50% the size of JPG and 20% smaller than WebP. Support is near-universal in modern browsers but spottier in image editors.
Yes. The converter runs entirely in your browser using WebAssembly. Your images are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Very large images (over a few hundred megapixels) can hit browser memory limits. Process in smaller batches if you run into issues.