Significantly smaller files.
BMP is a lossless format that prioritizes fidelity over size. Converting to AVIF introduces modern compression that typically reduces file size by an order of magnitude with no perceptible difference at normal playback or viewing.
WHY CONVERT
01
BMP is a lossless format that prioritizes fidelity over size. Converting to AVIF introduces modern compression that typically reduces file size by an order of magnitude with no perceptible difference at normal playback or viewing.
02
AVIF is accepted by a wider range of image viewers, editors, and content systems than BMP. The conversion removes a recurring compatibility friction without changing what the file actually contains.
03
AVIF files are typically smaller than their BMP counterparts, which reduces hosting, transfer, and storage costs at scale. The savings compound when serving the same content to many recipients.
Visit this page on any modern browser — no install, no signup, no plugin.
Drag your BMP into the drop area, or click to pick one from your device.
Conversion runs entirely in your browser. When it's done, your AVIF file downloads to your device.
QUALITY & FIDELITY
FORMAT SPECS
| BMP | AVIF | |
|---|---|---|
| Extensions | .bmp .dib | .avif |
| MIME types | image/bmp | image/avif |
| Introduced | 1990 | 2019 |
| Maintainer | Microsoft / IBM | Alliance for Open Media |
| Magic # | 42 4D | — |
| Spec | View spec ↗ | View spec ↗ |
COMPATIBILITY
| Platform | Windows | macOS | iOS | Android | Chrome | Firefox | Safari | Edge |
|---|---|---|---|---|---|---|---|---|
| BMP | Native | Native | Native | App | Native | Native | Native | Native |
| AVIF | App | Native | Native | Native | Native | Native | Native | Native |
Why LocalConvert
| Category | LocalConvert | Cloud converters |
|---|---|---|
| PRIVACY | Files never leave your device. The whole pipeline runs in your browser via WebAssembly. | Files travel to a remote server, sit in queue storage, and may be retained for analytics or moderation. |
| COST | Free, no signup, no daily quotas. | Often free for small files; paid tiers for batch / large / commercial use. |
| LIMITS | Limited only by your device's memory and CPU. Multi-GB files OK on desktop. | Typical 100 MB to 1 GB per-file caps, plus rate limits. |
A simple, uncompressed raster format from Windows. Large file sizes but easy to read and write.
Typical uses
Legacy Windows software, ICO source assets, simple bitmap exchange.
A next-generation image format with exceptional compression, alpha, and HDR support. Roughly half the size of comparable JPEG.
Typical uses
Optimized web delivery, modern browsers, photography portfolios.
Yes. LocalConvert is completely free, with no signup and no per-file or per-day limits.
No. BMP to AVIF conversion happens entirely inside your browser using WebAssembly — your file never leaves your device.
There's no fixed cap — the practical limit is your device's available memory. Very large files may take longer or fail on low-RAM devices.
Yes — once the page has loaded, BMP to AVIF conversion works without an internet connection. Re-open the page once to cache it.
LocalConvert uses the industry-standard tools (FFmpeg, ImageMagick, Pandoc) — quality matches what professionals use on the command line. Lossy formats will still lose some quality on each re-encode.
Last verified:
BMP to AVIF is processed in your browser with WebAssembly. No upload, no tracking, no limits. Your file never leaves your device.