Convert BMP to AVIF Online Free
Convert uncompressed BMP bitmaps to the ultra-efficient AVIF format. Achieve up to 99% file size reduction while maintaining near-perfect visual quality.
To convert BMP to AVIF, drop your BMP file into the converter above. ChangeThisFile compresses the uncompressed bitmap into AVIF format directly in your browser, achieving up to 99% file size reduction. The conversion is free, and your files never leave your device. AVIF delivers the best compression available.
Convert BMP to AVIF
Drop your BMP file here to convert it instantly
Drag & drop your .bmp file here, or click to browse
Convert to AVIF instantly
BMP vs AVIF: Format Comparison
Key differences between the two formats
| Feature | BMP | AVIF |
|---|---|---|
| Compression | Uncompressed (raw pixels) | AV1-based lossy or lossless |
| File size | Very large (raw data) | Up to 99% smaller |
| Color depth | Up to 32-bit | Up to 12-bit per channel, HDR |
| Transparency | Limited (32-bit only) | Full alpha channel |
| Animation | Not supported | Supported via AVIF sequences |
| Browser support | Universal | Chrome 85+, Firefox 93+, Safari 16.4+ |
| Best for | Raw editing, Windows | Modern web delivery, maximum compression |
When to Convert
Common scenarios where this conversion is useful
Compressing scanner output for web
Scanners often produce large BMP files. Converting directly to AVIF gives you the smallest possible web-ready file, shrinking a 30MB scan to under 500KB.
Archiving bitmap collections
Legacy BMP image archives consume enormous storage. Convert to AVIF to reclaim 95-99% of disk space while maintaining excellent visual quality for future reference.
Preparing raw captures for web delivery
Screen capture tools and frame grabbers that save as BMP produce files too large for web use. AVIF conversion makes them web-ready at the smallest possible size.
Maximum compression from lossless source
Starting from uncompressed BMP means AVIF can achieve its best compression ratios. There are no prior compression artifacts to work around.
How to Convert BMP to AVIF
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1
Drop your BMP file
Drag and drop your BMP image into the converter area, or click browse to select it from your device.
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2
Instant conversion
Your browser decodes the raw BMP pixel data and encodes it as AVIF using the Canvas API. The AV1 codec achieves extreme compression ratios.
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3
Download your AVIF
Save the converted AVIF file. Expect 95-99% file size reduction compared to the original uncompressed BMP.
Frequently Asked Questions
Expect 95-99% reduction. A 30MB BMP photo typically becomes 300KB-1MB as AVIF. The savings are extreme because BMP stores raw uncompressed pixels while AVIF uses state-of-the-art AV1 compression.
At default quality settings, the visual difference is imperceptible for photographs. Since BMP is uncompressed, AVIF encodes the pristine source data efficiently without compounding existing artifacts.
AVIF produces the smallest files of any widely supported format — 30-50% smaller than JPG and 20% smaller than WebP at equivalent quality. It also supports transparency and HDR, which JPG cannot.
Chrome 85+, Firefox 93+, Edge 121+, Safari 16.4+, and Opera 71+. This covers over 93% of global browser usage. Keep the BMP or convert to JPG/WebP as fallback for older browsers.
If your 32-bit BMP contains alpha channel data, AVIF will preserve the transparency. AVIF supports full alpha channel with semi-transparent pixels.
AVIF uses the AV1 codec which is more computationally intensive than JPG or WebP encoders. The extra processing time results in significantly better compression. Large BMPs may take a few seconds.
Yes. All conversion happens in your browser. Your BMP files are never uploaded to any server, making this safe for medical scans, confidential documents, and personal photos.
Yes, ChangeThisFile also offers AVIF to BMP conversion. However, any detail lost during AVIF lossy compression cannot be recovered.
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