BMP to AVIF Converter

About BMP to AVIF

Converts a BMP to AVIF, the AV1-based image format that reaches smaller files than JPEG or WebP at similar visual quality. AVIF is best for photographs and gradients on modern websites, and an uncompressed bitmap shrinks dramatically. The file is written by a real AVIF encoder that runs inside your browser tab, so the result is a genuine .avif file in Chrome, Edge, Firefox and Safari alike.

How to use it

1. Drop a BMP file onto the drop zone or click to choose a .bmp file.
2. Confirm the Source preview shows the bitmap you meant to convert.
3. Drag the Quality slider toward Smaller file or Better quality. It starts at 85.
4. Press Convert to AVIF. The first conversion takes a moment longer while the encoder loads.
5. Review the Output panel and press Download AVIF.

When to use it

• Shrinking a bitmap photo for a site that already serves AVIF to modern clients.
• Comparing AVIF and WebP output sizes for the same source picture.
• Turning an old uncompressed scan or screenshot into a file small enough to email.

Questions about BMP to AVIF

Why is the first conversion slower than a JPG or WebP one?

AVIF encoding is heavier than JPEG or WebP, and the encoder is a WebAssembly module fetched only when you first convert to AVIF. Later conversions in the same tab reuse it and start immediately.

Is there a quality control?

Yes. The Quality slider maps onto the AVIF encoder's own quality scale. Lower values give a smaller, softer file, and higher values keep more detail at the cost of size.

What makes AVIF smaller than JPEG?

It uses the AV1 video codec's intra-frame tools, with larger flexible blocks and better prediction. That lets it drop the same amount of visible detail using fewer bytes, especially in smooth areas.

Will every program open the AVIF I download?

Current browsers display AVIF, but some older editors, email clients and print services do not. If you need a bitmap replacement that opens anywhere, the BMP to PNG or BMP to WebP converter is safer.

Related tools

• AVIF to BMPConvert AVIF images to BMP format in your browser — no upload required.
• PNG to AVIFConvert PNG images to AVIF format in your browser — no upload required.
• JPG to AVIFConvert JPG images to AVIF format in your browser — no upload required.
• ICO to AVIFConvert ICO images to AVIF format in your browser — no upload required.
• GIF to AVIFConvert GIF images to AVIF format in your browser — no upload required.
• WEBP to AVIFConvert WEBP images to AVIF format in your browser — no upload required.