How do I convert BMP to AVIF?

Add your BMP file to the upload area above, then press Convert. The AVIF file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to AVIF reduce quality?

AVIF uses lossy compression, so some data is discarded. At the default quality the difference is very hard to see or hear; raise the quality setting if you need to be certain, at the cost of a larger file.

How large a file can I convert?

Up to 120 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

ImageAdjustable qualityRuns in your browser

BMP to AVIF Converter

Turn BMP files into AVIF in a couple of clicks. Uncompressed raster bitmap. Large but simple. Next-gen format with the best compression available today. The output is re-encoded, so quality depends on the settings you choose.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

BMP files (.bmp, .dib) · up to 120 MB each

or paste files from your clipboard

Ready when you are

Drop a BMP file above and FileTools360 will turn it into AVIF — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your BMP files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control quality, dimensions, rotation and metadata removal.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

BMP and AVIF explained

BMP stores pixels essentially raw, with little or no compression. A 1920×1080 BMP is around 6 MB regardless of what the picture contains, because every pixel takes the same space whether it is part of a gradient or a flat colour.

AVIF stores still images using the AV1 video codec's intra-frame compression. It generally achieves the smallest files of any widely supported format, and it handles wide colour gamut and HDR, which JPEG cannot.

Where BMP files come from: Legacy Windows software, some scientific and industrial imaging tools.
Where AVIF is used: Performance-focused websites and modern image pipelines.

BMP vs AVIF

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

BMP compared with AVIF
Property	Source	Target
Compression	Uncompressed	Lossy or lossless
Transparency	No	Yes
Animation	No	Yes
Introduced	1990	2019
Browser support	Broad, though rarely the best choice today.	Modern browsers only. Limited desktop app support.

BMP is stronger at: Trivially simple to read and write. No compression artefacts whatsoever. Still readable by very old software.
AVIF is stronger at: The best compression of any broadly supported image format. Handles HDR and wide colour gamut. Supports transparency and animation.

Why convert BMP to AVIF?

People make this switch when they run into the limits of BMP: almost always — PNG gives you the same lossless fidelity in a fraction of the space. AVIF is the better fit when you control the audience (a modern website) and file size is the priority.

There is also a size argument: BMP stores data with little or no compression, so the AVIF version is normally dramatically smaller for the same content.

BMP limitations that prompt the switch: Enormous files. No standard support for transparency in most variants. Effectively unusable on the web.
What you give up: Encoding is slow compared with JPEG or WebP. Desktop application support is still thin.

Does converting BMP to AVIF reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.