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Turn your AVIF files into BMP right in the browser — this tool will grow each file and hand it back in seconds, with nothing uploaded to any server. AVIF is the newest AV1-based format with the best compression available today, often half the size of JPEG. BMP is an uncompressed Windows bitmap: every pixel is stored raw, so quality is exact but files are very large. Because BMP has no transparency, any transparent areas are flattened onto a background colour you choose. Free, private, unlimited, and watermark-free.
How to Convert AVIF to BMP
Add your AVIF file
Drag and drop, or click to browse. You can convert several at once — they are processed together, right here in your browser.
Convert to BMP
Press Convert. BMP is lossless, so every pixel is preserved exactly.
Download
Save each BMP file, or grab them all as a ZIP. Nothing was ever uploaded, so nothing needs deleting.
Why convert AVIF to BMP?
The main reason is exact pixel data with zero compression, occasionally required by legacy Windows software. AVIF excels at modern web delivery, but when you need pixel-perfect quality, BMP is the better fit. This tool makes that switch instantly, right in your browser.
What happens to quality?
BMP is a lossless format, so the conversion preserves your image exactly — no detail is discarded in the BMP encoding itself.
A note on file size
Note that BMP files are usually larger than AVIF — BMP stores 24-bit uncompressed colour, so this trades size for compatibility.
About AVIF
AVIF is the newest AV1-based format with the best compression available today, often half the size of JPEG. Best for modern web delivery, offering the smallest files at a given quality with transparency and HDR.
About BMP
BMP is an uncompressed Windows bitmap: every pixel is stored raw, so quality is exact but files are very large. Best for exact pixel data with zero compression, occasionally required by legacy Windows software.
Common Uses for AVIF to BMP
- Converting AVIF to BMP for a project that specifically requires Bitmap files, where AVIF is not accepted.
- Preparing images for software or systems that only read BMP.
- Batch-converting a whole folder of AVIF images to BMP at once, instead of doing them one at a time.
- Switching a AV1 Image File Format export into BMP so it opens correctly in the tools your team actually uses.
- Archiving AVIF images as lossless BMP so no further quality is lost over time.
AVIF vs BMP: Key Differences
| Aspect | AVIF | BMP |
|---|---|---|
| Compression | Lossy or lossless | Lossless |
| Transparency | Supported | Not supported |
| Animation | Supported | Not supported |
| Colour depth | up to 12-bit colour with alpha | 24-bit uncompressed colour |
| Typical file size | Small | Large |
| Best used for | modern web delivery | exact pixel data with zero compression |
Tips & Things to Know
Check the file size after converting
Note that BMP files are usually larger than AVIF — BMP stores 24-bit uncompressed colour, so this trades size for compatibility. If size matters for your use case, the before-and-after figures shown above tell you exactly what changed, so there are no surprises when you upload or share the result.
Choose a background colour
Because BMP has no transparency, any transparent areas are placed on a background colour (white by default, and adjustable) so nothing turns black or breaks.
Everything stays on your device
This converter runs entirely in your browser using your own processor. Your AVIF files are never uploaded, stored, or seen by anyone, which makes it safe for private photos, client work, and confidential documents. When you close the tab, nothing remains.
The conversion is faithful
BMP is lossless, so every pixel is preserved exactly as it was in your AVIF, meaning you do not have to worry about settings — just convert and download.
Frequently Asked Questions
How do I convert AVIF to BMP for free?
Add your AVIF file above and press Convert. The BMP download appears in seconds. It is completely free, with no signup, no limits and no watermark.
Is my AVIF uploaded to a server?
No. The entire conversion runs inside your browser using your device's own processor, so your images never leave your computer. That matters for private photos and confidential work.
Can I convert multiple AVIF files at once?
Yes. Add as many as you like and they are converted in one batch, then offered individually or as a single ZIP download.
Will converting to BMP reduce quality?
No. BMP is lossless, so the conversion keeps every pixel. Any quality limit comes only from the original AVIF, not from this step.
Does BMP support transparency?
No, BMP has no transparency. Transparent areas are filled with a solid background colour (white by default) during conversion.
Why is my BMP file larger than the AVIF?
BMP stores 24-bit uncompressed colour without lossy compression, so it is naturally larger than AVIF. This is expected and the image quality is fully intact.
What is the difference between AVIF and BMP?
AVIF is the newest AV1-based format with the best compression available today, often half the size of JPEG. BMP is an uncompressed Windows bitmap: every pixel is stored raw, so quality is exact but files are very large. That difference is what this conversion is really about.
Is there a file size limit?
Because processing happens in your browser, very large images depend on your device's memory, but typical photos convert instantly. Nothing is capped by an upload limit.
Do I need to install anything?
No. This works in any modern browser on any device — Windows, Mac, Android or iPhone — with nothing to install.
Is this AVIF to BMP converter really free?
Completely free, forever, with no account, no watermark and no hidden premium wall.
100% free · No signup · No watermark · Files never leave your browser
Last updated: July 18, 2026 · FlipMyFormat Convert AVIF to BMP
Written and maintained by the FlipMyFormat team · Runs entirely in your browser