What BMP to AVIF conversion does

Convert a BMP image to AVIF directly in your browser, with adjustable quality. Encoding uses the browser canvas API and is verified as a real image/avif download before it reaches your downloads folder.

How to convert BMP to AVIF

1. Choose a BMP file.
2. Adjust AVIF quality if needed.
3. Select Convert & download.
4. Save the .avif file from your browser downloads.

Why use this conversion

AVIF can shrink UI graphics and photos for sites that already serve modern image formats.

Transparency and output quality

Transparent pixels from the source stay transparent when the browser AVIF encoder supports alpha. This tool does not flatten onto an arbitrary background before encoding. The quality slider defaults to 90%. Lower values usually shrink the file and can introduce compression artifacts. Smaller files are not guaranteed for every source image.

Privacy and local processing

• Processing occurs locally in the browser.
• Files are not uploaded to Looty Tools for conversion.
• Converted files remain on your device.

Limits and known issues

• Input: BMP (.bmp) only, up to 25.0 MB and 8,192 px per side.
• Canvas AVIF encoding is Chromium-first today. Unsupported browsers show a clear error instead of a mislabeled download, and usage is not recorded for a failed conversion.
• Transparency is kept only when the browser decodes a real alpha channel from the source BMP; most BMP files have no transparency.
• Metadata is not preserved in the downloaded file.

Related tools

• BMP to AnyConvert BMP images into multiple common output formats.
• BMP to TIFFConvert BMP images to TIFF for print and archival use.
• BMP to GIFConvert BMP images to a static GIF.

BMP to AVIF FAQ

Why convert BMP to AVIF?

AVIF can shrink UI graphics and photos for sites that already serve modern image formats.

Can every browser create AVIF?

No. Canvas AVIF encoding is Chromium-first today. The tool probes encoding support and verifies the download is image/avif — unsupported browsers get a clear error instead of a mislabeled download.

Does AVIF output keep transparency?

Transparent pixels stay transparent when the browser AVIF encoder supports alpha. This tool does not flatten onto an arbitrary background.

Does the source BMP actually have transparency?

Rarely. Most BMP files have no alpha channel at all. When the browser does decode real alpha data from a 32-bit source BMP, it is preserved in output formats that support transparency.

Are my files uploaded?

No. Conversion runs locally in your browser and does not upload your file to Looty Tools servers.

What is validated before conversion?

The file must actually be a BMP — the tool checks the "BM" header bytes, not just the filename or extension, before decoding.