What's the difference between BMP and AVIF?

BMP is a Windows-era uncompressed raster format. AVIF is the newest mainstream image format, built on top of the AV1 video codec.

What quality should I pick?

For AVIF, quality 75-85 is the sweet spot — small files with no visible difference from the original. Lower than 60 starts to show artifacts. Higher than 90 mostly just makes the file bigger.

Why convert away from BMP?

BMP is a Windows-era uncompressed raster format. Where it falls down: anything where file size matters (which is almost everywhere); web display, email, archive — pick literally any other format. AVIF addresses that for most workflows.

When is AVIF the right format?

AVIF is a good choice for: hero images and other content where every byte matters; build-time image pipelines that can absorb the encoding cost; photos with smooth gradients (the AV1 codec excels here). It is a poor choice when on-the-fly conversion where the user is waiting (slow encode).

Anything surprising about BMP or AVIF?

BMP can technically carry a small palette and run-length compression, but in practice 99% of BMPs in the wild are uncompressed. And on the AVIF side: AVIF encoding is single-threaded by default — large images can take 5–10 seconds in browser.

Does this work on mobile?

Yes. The drop zone falls back to your phone's file picker, and conversions run on-device just like desktop. Large files may be slower on mobile due to CPU and memory constraints, but the workflow is identical.

What's the maximum file size?

No hard limit — the browser handles it. Files under 50MB convert in a few seconds. Larger files work but may take longer as the browser allocates memory. If you hit issues, batch in smaller groups.

Convert BMP to AVIF

Convert BMP to AVIF, typically the smallest of the modern web formats. BMP is uncompressed, so expect a dramatic size reduction. Free, in your browser.

Drop images to convert

PNG, JPG, WebP, AVIF, JPEG XL, TIFF, BMP, GIF, SVG, HDR, ICO — any combination

Files stay on your device. Open DevTools' Network tab to verify.

Output format

AVIF

Quality82%

Overview

Why convert BMP to AVIF

AVIF files are typically much smaller than BMP at equivalent quality — usually the main reason to make this conversion. Smaller files mean faster page loads, smaller email attachments, and less storage. BMP is uncompressed, so expect a dramatic size reduction.

Comparison

BMP vs AVIF: what actually differs

BMP compared with AVIF across encoding, fidelity, file size and support.
Attribute	BMP	AVIF
Compression	—	Lossy
Transparency	No	Yes
Animation	No	Yes
Typical file size	Very large	Small
Browser support	Major browsers will render BMP, but it's never the right choice for the web.	Supported in Chrome, Firefox, Safari 16+, and Edge. Pre-2022 devices may not decode it.

How to

How to convert BMP to AVIF

01
Drop your BMP files
Drag one or more BMP files onto the dropzone above, or click to browse. Files stay on your device — nothing uploads.
02
Convert in your browser
convert.now decodes each BMP and re-encodes it as AVIF via WebAssembly. The conversion runs in a Web Worker so the page stays responsive.
03
Download the result
Download a single AVIF file or, for batch conversions, a zip of all converted files. Filenames preserve the originals.

Why here

Why convert.now

Private
Files stay in your browser. No upload step. Nothing for anyone to see.
Fast
No queue, no upload wait. Conversion starts the moment you drop a file.
Free
No ads. No file-count limit. No sign-up wall. Just the converter.

FAQ

BMP to AVIF: common questions

No. The conversion from BMP to AVIF runs entirely in your browser using WebAssembly. Files never leave your device. Open DevTools' Network tab if you'd like to verify — there are no network requests with file contents.

Related BMP converters

Last updated 27 August 2026

Why convert BMP to AVIF

BMP vs AVIF: what actually differs

How to convert BMP to AVIF

Drop your BMP files

Convert in your browser

Download the result

Why convert.now

BMP to AVIF: common questions

Related BMP converters