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Convert BMP to AVIF Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your BMP file
Click the upload button or drag and drop your BMP file onto the converter.
2Convert
Click Convert. Convertify processes your file instantly using Rust and libvips.
3Download AVIF
Download your converted AVIF file. The original BMP is deleted from the server immediately.
Supported Image Formats
BMP
Uncompressed bitmap format. Maximum quality but very large file size.
AVIF
Next-gen format with excellent compression. Up to 50% smaller than JPG.
HEIC
Apple photo format used by iPhone and iPad. High quality with small file size.
HEIF
High Efficiency Image Format — same as HEIC, used on Apple devices.
WebP
Modern image format by Google. Up to 30% smaller than JPG with the same quality.
PNG
Lossless format that preserves every pixel. Best for screenshots and logos.
JPG
Universal format for photos. Supported everywhere, great balance between quality and file size.
GIF
Classic format for simple animations. Supports transparency and up to 256 colors.
TIFF
Professional lossless format used in printing and photography.
PPM
Portable Pixmap format used in Unix/Linux environments.
HDR
High Dynamic Range format storing extended brightness data.
FITS
Flexible Image Transport System used in astronomy and science.
PDF
Portable Document Format. Convert PDF pages to JPG, PNG or WebP images.
AVIF vs WebP vs HEIC vs JPG
Quick comparison to help you choose the right format
AVIF
- Size: Up to 50% smaller than JPG
- Browsers: Chrome, Firefox, Safari
- Transparency: ✓
- Best for: Web performance
WebP
- Size: 25-35% smaller than JPG
- Browsers: All modern browsers
- Transparency: ✓
- Best for: Web compatibility
HEIC
- Size: ~50% smaller than JPG
- Browsers: Safari only
- Transparency: ✓
- Best for: iPhone storage
JPG
- Size: Baseline
- Browsers: All browsers & apps
- Transparency: ✗
- Best for: Universal sharing
Frequently Asked Questions
- How much smaller will my AVIF be compared to BMP?
- Typically 90–95% smaller. A 6 MB BMP image typically becomes 200–400 KB as AVIF at high quality. The exact reduction depends on image content and quality settings.
- Will I lose quality converting BMP to AVIF?
- Minimal quality loss at high quality settings. AVIF uses lossy compression by default. Convertify converts at high quality, producing output visually identical to the original BMP for most practical purposes.
- Is AVIF or JPG better for converting BMP?
- AVIF produces 30–50% smaller files than JPG at equivalent visual quality. Choose AVIF for web delivery to modern browsers. Choose JPG for universal compatibility including email, older software, and legacy browsers.
- Does converting BMP to AVIF support transparency?
- Standard BMP files do not contain transparency. AVIF supports full alpha channel transparency, but the converted file will only have transparency if the source BMP has it (BMP v4/v5 only, which is rare).
- Is AVIF supported by all browsers?
- AVIF is supported by Chrome 85+, Firefox 93+, Safari 16+, and Edge 121+ — covering approximately 95% of global browser traffic. For maximum compatibility, use JPG or PNG.
- Can I convert multiple BMP files to AVIF at once?
- Yes. Convertify supports batch conversion — upload up to 10 BMP files and download them all as AVIF simultaneously.
Why convert BMP to AVIF?
BMP stores raw, uncompressed pixels — every pixel at full color depth with no compression. A 1920×1080 BMP is approximately 6 MB regardless of image content. AVIF achieves up to 50% better compression than JPEG and typically 90–95% better compression than BMP at equivalent visual quality. Converting BMP to AVIF produces dramatically smaller files suitable for web delivery, email, and storage — while maintaining excellent visual quality. AVIF's 10-bit color depth and superior codec handle BMP's raw data efficiently.
BMP vs AVIF comparison
| Feature | BMP | AVIF |
|---|---|---|
| Compression | None (raw pixels) | AV1 lossy/lossless |
| File size (1920×1080) | ~6 MB | ~200–400 KB at high quality |
| File size reduction | Baseline | 90–95% smaller |
| Browser support | Limited | ~95% (Chrome, Firefox, Safari, Edge) |
| Transparency | Limited (BMP v4+ only) | Full alpha channel |
| HDR support | No | Yes (10-bit color) |
| Best for | Legacy Windows apps, uncompressed archival | Web delivery, modern compression |
File size: BMP to AVIF compression in practice
BMP is one of the least compressed formats in common use. A typical 12-megapixel photograph saved as BMP is approximately 34 MB. The same image as AVIF at high quality is typically 800 KB–1.5 MB — a 95–97% reduction. Compared to JPEG, AVIF achieves roughly 50% better compression; compared to uncompressed BMP, the savings are extreme. For web use, BMP files are entirely impractical — they exceed most browser cache limits and cause severe page load performance issues. AVIF produces web-ready files from BMP sources with minimal visual quality loss.
Where BMP files come from in 2026
BMP is a legacy format primarily encountered in Windows-specific workflows. Screen captures on older Windows versions default to BMP. Legacy design software, CAD tools, and embedded systems often output BMP. Windows Paint saved BMP as its default format until relatively recent versions. Medical imaging and some industrial systems use BMP for uncompressed storage. BMP's uncompressed nature means no quality is lost during the original export, making it an excellent source format — all image data is intact for conversion to AVIF.
AVIF vs JPG vs PNG for BMP conversion
The right target format depends on your use case. For web delivery to modern browsers, AVIF provides the smallest files (~95% smaller than BMP) with excellent quality. For universal compatibility including older browsers and non-browser applications, JPG is safer (90–95% smaller than BMP). For images with transparency or sharp text, PNG preserves lossless quality (50–80% smaller than BMP). Choose AVIF when you control the delivery environment and know your audience uses Chrome, Firefox, Safari, or Edge. For email, print, or legacy software, JPG or PNG is more reliable.
Transparency in BMP to AVIF conversion
Standard BMP (versions 1–3) does not support transparency — all pixels are fully opaque. BMP v4 and v5 added alpha channel support but this is rarely used in practice. If your BMP file does not have transparency (almost always the case), the AVIF output will also be fully opaque. If you have a BMP v4/v5 file with an alpha channel, Convertify preserves that transparency in the AVIF output. AVIF supports full 8-bit alpha channels with smooth semi-transparency — better than BMP's limited implementation.
How Convertify converts BMP to AVIF
Convertify uses a Rust backend with libvips for BMP to AVIF conversion. libvips reads BMP files directly and encodes them to AVIF using the AV1 codec at high quality settings by default. The streaming pipeline handles large BMP files efficiently. Files are processed server-side over HTTPS and deleted immediately after download. No account required.