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AVIF

BMP to AVIF Converter — Free, Online, No Upload

BMP files are enormous — shrink them to AVIF and go from 30 MB to under 1 MB without visible quality loss.

Free · no signup2 free files a day100% in-browser · no upload

Tap to select BMP files

or click to browse

2 free files per day (2 left today) · Up to 10 MB each · Upgrade for more

Free image outputs include a repeating formatdrop.com watermark · Remove with Pro

✓ Files never uploaded✓ 100% browser-based✓ No account required
Need the reverse?AVIF → BMP

How to convert BMP to AVIF online

  1. 1

    Drop your BMP file

    Drag your Bitmap Image File file onto the box above, or click it to pick a file.

  2. 2

    Wait a few seconds

    Conversion starts on its own and runs on your device, not on a server.

  3. 3

    Download your AVIF

    Click Download to save the AV1 Image File Format file.

BMP vs AVIF: format overview

BMP

Bitmap Image File

Microsoft · 1987

Compression
none
Transparency
No
  • ✓ No compression — original pixel data preserved
  • ✓ Universal Windows support
  • ✗ No compression = massive files
AVIF

AV1 Image File Format

Alliance for Open Media · 2019

Compression
lossy
Color depth
12-bit
Transparency
Yes
  • ✓ Smallest file size of any image format (50% smaller than WebP)
  • ✓ Excellent HDR and wide-gamut color support

BMP magic bytes: 42 4D

AVIF magic bytes: 00 00 00 .. 66 74 79 70 61 76 69 66

Why convert BMP to AVIF?

BMP files store images as raw, uncompressed pixel data — which means they can be enormous. A single screenshot or scanned image saved as BMP can be 10, 20, or even 50 MB. That's fine for local storage on a workstation, but impractical for anything involving web delivery, email attachments, or cloud storage.

AVIF achieves compression ratios that dramatically reduce file size without visible quality loss. A 20 MB BMP can become a 500 KB AVIF at high quality — a 40:1 reduction. AVIF is supported in all modern browsers and is increasingly accepted by web platforms, CDNs, and image optimization services. If you're taking BMP files out of a local workflow and putting them on the web or into a modern application, AVIF is the best format in terms of quality per byte.

The conversion from BMP to AVIF is straightforward — BMP is lossless and uncompressed, so the AVIF encoder starts from a perfect source. The converter uses quality 85 (out of 100), which keeps fine detail while still producing a fraction of the BMP's size; at normal viewing sizes the AVIF is usually indistinguishable from the original.

Quality & file size: BMP to AVIF

Typical sizes (12MP photo): BMP 35–40 MB → AVIF 0.8–2 MB.

On the free tier, AVIF output has a repeating formatdrop.com watermark; Pro output doesn't.

AVIF output is encoded at quality 85 — a small file with no visible difference for most photos.

Frequently asked questions

How much smaller will the AVIF be compared to my BMP?
Dramatically smaller — a 30 MB BMP typically compresses to under 1 MB as AVIF at high quality. AVIF's compression efficiency is among the best of any image format available today.
Is BMP to AVIF lossless?
No. The converter writes lossy AVIF at quality 85, which looks the same as the BMP to most viewers at a fraction of the size. If you need pixel-perfect output, convert the BMP to PNG instead.

Your BMP file never leaves this tab — FormatDrop has no endpoint that receives file data. How it works