AVIF to BMP Converter
Convert AVIF to BMP in your browser. AVIF files usually come from image CDNs, modern web build pipelines and some recent phones; BMP is the better fit for legacy software and embedded systems that require it. You get an uncompressed 24-bit BMP, or 32-bit with alpha when the image has transparency. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
AVIF expected · other image formats also work
How to use AVIF to BMP
- 1
Add your AVIF files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the BMP is written uncompressed. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .bmp files one at a time or together as a ZIP.
Why use Aback Images for avif to bmp
Where the BMP goes next
BMP opens in every operating system and browser.
BMP next to AVIF
The BMP is written uncompressed, so expect it to be several times larger than the AVIF, which stores lossy or lossless AV1 intra-frame coding.
No new artefacts
AVIF is already lossy, since it stores lossy or lossless AV1 intra-frame coding; the BMP keeps the decoded pixels uncompressed, so this step adds no compression damage of its own.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
AVIF vs BMP
What changes from AVIF to BMP
Encoding: the AVIF uses lossy or lossless AV1 intra-frame coding; BMP uses usually none; RLE for some 4 and 8-bit files, and the download is an uncompressed 24-bit BMP, or 32-bit with alpha when the image has transparency.
Bit depth: 8, 10 or 12 bits per channel in the AVIF; BMP allows 1, 4, 8, 16, 24 or 32 bits per pixel, and the BMP written here has 24 or 32 bits per pixel. 10 and 12-bit AVIFs, including HDR ones, are decoded to 8 bits per channel.
Colour: YUV 4:4:4 or 4:2:0 with BT.709, Display P3 or BT.2020 primaries, HDR curves possible in the AVIF; BMP supports RGB or an indexed palette, written here as 8-bit sRGB.
Transparency: the AVIF stores it as an auxiliary AV1 image stored beside the colour image; the BMP keeps it as an optional fourth byte in 32-bit files, which many programs ignore.
Animation: an AV1 image sequence under the 'avis' brand; the BMP holds one image, so only the first frame is converted.
Metadata: the AVIF can carry EXIF, XMP and ICC stored as HEIF items; BMP can carry nothing beyond the header's resolution fields (and a colour profile in rare V5 headers), but nothing is copied across.
About AVIF
AVIF uses the AV1 video codec for still images. It is the most efficient widely supported format, often half the size of JPEG, with HDR, wide colour and transparency, but encoding is slow.
An AVIF is a HEIF file, the same ISO base media boxes as MP4, with the brand 'avif'. The picture is an AV1 key frame stored as an image item, and its size, colour and pixel layout are item properties.
AVIF files usually come from image CDNs, modern web build pipelines and some recent phones.
About BMP
BMP stores raw, uncompressed pixels. Files are huge but trivially simple, which is why some legacy Windows software, embedded displays and printers still ask for it.
A BMP is a 14-byte file header ('BM' and the offset to the pixels), a DIB header (40 bytes, or 108 and 124 bytes in the V4 and V5 versions that add colour masks and alpha), an optional palette, then pixel rows padded to 4 bytes and normally stored bottom-up.
When converting AVIF to BMP makes sense
BMP is the better choice for legacy software and embedded systems that require it, while AVIF suits maximum compression on modern websites.
BMP strengths: No compression artifacts; Read by very old and very simple software. Drawbacks to weigh: Enormous files; Poor support for transparency; No metadata.
Limitations
- Almost any other format needs more bytes than AVIF for the same picture, so expect the file to grow.
- HDR and wide-gamut AVIFs are mapped to standard sRGB on decode, so very bright highlights can look flatter than on an HDR screen.
- A BMP is uncompressed, about 3 bytes per pixel, or 4 with transparency, so expect a large file.
- Some older programs ignore the alpha channel of a 32-bit BMP and show transparent areas as black or white.
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Frequently asked questions
Does converting AVIF to BMP lose quality?
BMP is written uncompressed, so the pixels are stored exactly as decoded. Artefacts already in the AVIF stay, but nothing new is lost. 10 and 12-bit AVIFs, including HDR ones, are decoded to 8 bits per channel.
Is transparency kept in the BMP?
Yes. AVIF stores it as an auxiliary AV1 image stored beside the colour image, and the BMP is written with an alpha channel, so transparent areas stay transparent.
Will my animated AVIF stay animated?
No. BMP holds a single image, so only the first frame is kept. Convert to animated WebP, APNG or GIF to keep the motion, or export every frame with the GIF Frame Extractor.
Which apps open BMP files?
Every operating system and browser.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.