UnlimitedConvert
BMP to AVIF Converter
Turn BMP files into AVIF in seconds. Everything happens on your device: nothing is uploaded, and there's no limit.
Your images are processed in this browser tab and never uploaded.
Why convert BMP to AVIF?
BMP files are uncompressed and very large.
AVIF gives the smallest files of any image format, ideal for fast websites.
What to expect
- AVIF is lossy, so the file gets much smaller. At the default quality (90%) the difference is very hard to see; you can change it before converting.
- AVIF encoding takes a few seconds per large photo because it compresses much harder than other formats.
How to convert BMP to AVIF
Add your files
Drop your BMP files into the box or tap “select files”. Add as many as you like.
Pick the options
Set the quality. AVIF stays sharp even at 60–75%, with very small files.
Convert and download
Press Convert. Download each AVIF on its own, or everything at once as a ZIP file.
BMP vs AVIF
| BMP | AVIF | |
|---|---|---|
| Full name | Windows Bitmap | AV1 Image File Format |
| Compression | Lossless | Lossy |
| Transparency | No | Yes |
| Animation | No | Yes |
| Best for | old Windows programs, embedded devices and tools that require uncompressed images | the fastest-loading website images |
| Support | Opens on Windows, macOS and most image editors. | Current Chrome, Edge, Firefox and Safari show AVIF. Many desktop apps and older devices don't yet. |
About the formats
BMP (Windows Bitmap, 1990) is a simple, uncompressed Windows format. Files are large because every pixel is stored as-is, but almost any program, including very old software and embedded devices, can read it.
AVIF (AV1 Image File Format, 2019) is the newest major image format, based on the AV1 video codec. It usually produces the smallest files of all, often half the size of JPG, with transparency and HDR support.
Frequently asked questions
How do I convert BMP to AVIF?
Drop your BMP files into the box above (or tap Select files), check the options, then press Convert. Each AVIF downloads on its own, or you can download them all as one ZIP file.
Are my files uploaded anywhere?
No. The conversion runs entirely in your browser on your own device. Your BMP files are never sent to a server, so they stay private, and it works even on a slow connection once the page has loaded.
Is there a limit on how many BMP files I can convert?
No. Convert as many as you like, for free, without signing up. Very large batches are processed one after another so your browser stays responsive.
Will I lose quality converting to AVIF?
AVIF uses lossy compression, but at the default 90% quality the difference is practically invisible. Move the Quality slider up for the highest fidelity or down for smaller files.
Does it work on iPhone and Android?
Yes. It works in Safari, Chrome, Firefox and Edge on phones, tablets and computers. Nothing to install.