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Convert AVIF to BMP Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your AVIF
Click the upload button or drag and drop your AVIF file. Upload up to 10 files for batch conversion.
2Choose BMP output
BMP is selected by default on this page. Adjust quality settings if needed.
3Download
Click Convert and download your BMP file. For multiple files you get a ZIP archive.
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
- Does AVIF to BMP lose quality?
- The AV1 decompression itself is lossless (it faithfully reconstructs what the encoder stored). But AVIF's lossy compression already discarded some detail, and any 10-bit or HDR content is quantized to 8-bit sRGB for BMP. No additional lossy compression occurs.
- Why would anyone convert AVIF to BMP?
- Legacy systems, embedded firmware, industrial HMI panels, thermal printers, and CNC machines that only accept BMP. For all other purposes, JPG or PNG are better targets.
- What happens to 10-bit AVIF color in BMP?
- It is quantized to 8-bit. Subtle gradients may show slight banding. For preserving 10-bit precision, convert to 16-bit PNG instead.
- What happens to HDR AVIF?
- HDR transfer functions (PQ/HLG) are tone-mapped to SDR sRGB. The image looks correct on standard displays but loses extended dynamic range.
- Can AVIF transparency be preserved in BMP?
- Only in 32-bit BMP with the V5 header. In 24-bit BMP (default), transparent pixels become white. For reliable transparency, convert to PNG.
- How big will the BMP file be?
- A 1920×1080 24-bit BMP is always 5.93 MB regardless of the source format. AVIF files of the same resolution are typically 100–400 KB, so expect 15–60× size increase.
- Why is the BMP file so much larger than my AVIF?
- BMP stores every pixel as raw uncompressed bytes — 3 bytes per pixel for 24-bit color, 4 for 32-bit — with each row padded to a 4-byte boundary. AVIF uses AV1 codec compression achieving 80–95% reduction. A 1920×1080 AVIF of 200 KB produces a 5.93 MB BMP at 24-bit (roughly 30× larger) or 7.91 MB at 32-bit. At 4K the BMP is 23.73 MB. This is unavoidable — BMP has no lossy or lossless compression in standard use (RLE4/RLE8 exist but are rarely used and poorly supported).
- Why would anyone convert AVIF back to BMP?
- The main use cases are embedded systems and industrial software that only accept BMP. STM32 microcontrollers parse BMP because it requires no decompression library — just a few hundred lines of C reading raw pixels. ESC/POS thermal receipt printers (Epson TM series, Star Micronics), CNC laser engravers (LaserGRBL, LightBurn), Waveshare e-paper displays, and legacy Win32 applications using LoadImage() with IMAGE_BITMAP all require BMP input. Siemens WinCC, Allen-Bradley FactoryTalk, and GE iFIX industrial HMI panels also mandate BMP for overlay graphics.
Modern to legacy: what AVIF to BMP does
AVIF uses AV1 intra-frame compression — the most efficient still-image codec available in 2026, producing files roughly 50% smaller than equivalent JPEGs. BMP is the polar opposite: a raw pixel dump with zero compression dating to 1985. Converting AVIF to BMP decodes the AV1 bitstream into full RGB pixel data and writes it as an uncompressed Windows bitmap.
The conversion is straightforward but involves important transformations. AVIF supports 10-bit and 12-bit color depth, HDR transfer functions (PQ, HLG), and wide color gamuts (BT.2020). BMP is limited to 8 bits per channel and assumes sRGB. Convertify handles this by quantizing 10-bit values to 8-bit and tone-mapping HDR content to SDR sRGB, ensuring the BMP output displays correctly on standard monitors.
When you need AVIF to BMP
This conversion serves a niche but real need: receiving modern AVIF images (from websites, CDNs, or modern cameras) and feeding them into legacy Windows tools, embedded displays, or industrial equipment that only accepts BMP. A medical device running certified firmware might ingest BMP exclusively. A CNC laser engraver might require monochrome BMP for raster paths.
For most other purposes, converting AVIF to JPG or AVIF to PNG is more practical — both produce smaller files with better metadata support. BMP is the right choice only when the destination system specifically requires it.
Color depth and HDR handling
AVIF files from modern sources often carry 10-bit color (1,024 shades per channel vs 256 in 8-bit). HDR AVIF uses PQ or HLG transfer functions with BT.2020 primaries, covering a much wider color range than sRGB. BMP cannot represent any of this — it is an 8-bit sRGB format.
Convertify performs proper tone mapping when converting HDR AVIF: the PQ/HLG curve is mapped to sRGB gamma, and BT.2020 primaries are converted to sRGB via ICC transform. The result looks correct on standard displays but loses the extended dynamic range and wide gamut that AVIF preserves. If you need to retain HDR information, convert to 16-bit PNG instead.
File size impact
The file size increase is dramatic. A 200 KB AVIF photo (1920×1080) becomes a 5.93 MB 24-bit BMP — roughly 30× larger. At 4K resolution, expect 23.7 MB for 24-bit or 31.6 MB for 32-bit BMP. AVIF's AV1 compression is approximately 50% more efficient than JPEG, so the gap between AVIF and BMP is even wider than JPG-to-BMP.
This size explosion is the inherent cost of uncompressed storage. For embedded systems with fixed frame buffer sizes, the predictable BMP file size is actually an advantage — you know exactly how much memory to allocate.
Transparency handling
AVIF supports a full 8-bit alpha channel (and even 10-bit alpha in some configurations). Standard 24-bit BMP has no alpha support — transparent pixels are composited onto a white background. For AVIF images with transparency, 32-bit BMP with the BITMAPV5HEADER preserves alpha values, though compatibility with legacy tools varies.
If transparency preservation is critical, AVIF to PNG is the safer conversion path — PNG's alpha channel is universally supported.