Convert BMP to AVIF
BMP is an uncompressed Windows bitmap that keeps full pixel detail at a large file size. Converting to AVIF is a size decision: AVIF reaches a comparable picture in a smaller file, which is why modern sites serve it. Worth knowing before you start: AVIF is lossy, so the conversion trades some detail for a smaller file. Keep the BMP original if you may need to edit it again. The conversion runs entirely in your browser: there is no upload, no file size limit and no watermark on the result.
Drop your BMP files below and download AVIF in seconds. Free, unlimited and completely private: the conversion runs inside your browser, so your files never leave your device and are never uploaded to a server.
No upload. Works with your network switched off. Check it yourself, or read what actually happens to your file.
Why convert BMP to AVIF?
BMP stores pixels with little or no compression, which makes files huge but trivially simple to read. It is mostly seen in legacy Windows workflows, screenshots from older tools and some scientific software. Converting to a compressed format usually shrinks a BMP by 90 percent or more.
AVIF is based on the AV1 video codec and reaches even smaller files than WebP at the same visual quality. All modern browsers can display it, but many image editors and older tools cannot open it yet, which is the main reason people convert AVIF to an older format.
BMP vs AVIF at a glance
| BMP | AVIF | |
|---|---|---|
| Full name | Bitmap image | AV1 Image File Format |
| Compression | Uncompressed | Lossy or lossless |
| Transparency | No | Yes |
| Best for | Legacy Windows software and raw pixel data | Next generation web images |
What changes when you convert BMP to AVIF
| What happens | |
|---|---|
| Image quality | Reduced, by however much you choose. AVIF is lossy; the quality control above sets the trade. Keep the BMP original if you may need to edit it again. |
| Transparency | BMP has no alpha channel, so there is no transparency to lose. |
| EXIF and GPS | Removed. The conversion goes through a pixel buffer, so camera data and location are not carried into the AVIF file. |
| Colour profile | Not carried across. The image is handled in sRGB, which is right for the web and wrong for colour-managed print work. |
| Animation | Not applicable. BMP files here are single images. |
| File size | Smaller in almost every case, which is the reason for the conversion. How much smaller depends on the picture, so no figure is quoted here. |
How to convert BMP to AVIF
- Drop one or more BMP files into the box above, or click to browse.
- ImageConvert converts each file to AVIF right on your device.
- Download a single file, or grab everything at once as a zip.
Frequently asked questions
What is a BMP file?
BMP is an uncompressed Windows bitmap that keeps full pixel detail at a large file size.
What is an AVIF file?
AVIF is a next generation format with excellent compression, increasingly used on modern websites.
Is it free to convert BMP to AVIF?
Yes. There are no limits, no watermarks and no account needed. Convert as many BMP files as you like.
Are my files private?
Completely. Your BMP files never leave your browser and are never uploaded to a server, so your images stay on your device.