Images conversion
Convert BMP to AVIF
Updated Jul 2026
BMP is an old, uncompressed Windows image format that produces very large files. AVIF is a modern, compressed format used for smaller, high-quality images on the web. To convert, open the BMP in a converter and export it as AVIF. Doing this on your own computer keeps the image off other people's servers.
- Extension
- .bmp
- Type
- Images
- Typically
- Legacy Windows images
- Transparency
- None
- Extension
- .avif
- Type
- Images
- Typically
- Next-gen web images
- Compression
- Lossy
- Transparency
- Supported
Convert BMP to AVIF on your own computer. Nothing uploads.
How to convert BMP to AVIF
- Open Morphjet and drag in the BMP file, or a whole folder of them, you want to convert.
- Choose AVIF as the output format.
- Convert. The AVIF files are written next to your originals, and nothing leaves your machine.
BMP vs AVIF: what actually changes
| BMP | AVIF | |
|---|---|---|
| File size | Very large, little to no compression | Much smaller, often a fraction of the BMP's size |
| Quality | Lossless, pixel-perfect | Lossy by default, but very little visible loss at normal settings |
| Opens everywhere | Yes on Windows, spotty elsewhere | Growing support in modern browsers and recent OS versions, not universal yet |
| Transparency | No, in practice | Yes |
| Metadata | Minimal, rarely carries any | Can store metadata, though most exports strip it |
| Good for | Old software that expects a raw bitmap | Web pages, sharing, and general storage |
When to convert, and when not to
Convert BMP to AVIF when you want to put an old screenshot, scan, or exported image on a website or send it to someone, since AVIF can shrink a BMP down dramatically while still looking almost identical.
Keep the BMP if you need a file that opens correctly in older Windows software or a program that specifically expects an uncompressed bitmap.
Why not just use an online converter?
A lot of BMP files sitting on a drive are old screenshots, scans, or exports from Windows tools, and when you convert a whole folder of them through an online converter, every single one gets uploaded to a stranger's server first. Converting on your own computer keeps those images, whatever they show, on your machine the entire time.
Questions
Does converting BMP to AVIF lose quality?
AVIF uses lossy compression, so technically yes, but at normal quality settings the loss is not visible to the eye, while the file can end up a fraction of the original BMP's size.
Will AVIF files open everywhere BMP does?
Not yet. AVIF works in modern browsers and recent versions of Windows and Mac, but some older software and devices can't open it, while BMP support goes back decades.
Why are BMP files so large?
BMP stores each pixel with little or no compression, so a BMP can be many times larger than a JPG or AVIF of the exact same image.
Does AVIF support transparency the way BMP doesn't?
Yes. AVIF can keep a transparent background, which is useful if you're turning an old bitmap graphic into something you'll place over other content.
Can I convert BMP to AVIF without uploading the files?
Yes. Doing it with a desktop app like Morphjet keeps the files on your own computer the whole time, with no upload and no account needed.
Morphjet converts BMP, AVIF, and 1,800+ other formats, all on your machine. Launching this July.