AVIF → BMP Converter

Convert .avif images to .bmp locally in your browser. No uploads.

Drag & Drop your .avif here, or pick a file:

Nothing is uploaded. Some browsers may not decode AVIF; if your image won't load, try a different browser.

Output width (px)

Leave blank to use source width.

Output height (px)

If one dimension is blank, aspect ratio is preserved.

BMP Background

BMP is opaque; transparent pixels will be filled with:

Fit

How the source fits into the target size.

Your preview will appear here after conversion.

Source size: -

Output size: -

AVIF → BMP - Quick Cheat Sheet

Local only: Files never leave your device; everything runs in the browser.
Alpha handling: BMP (24-bit) doesn;t support transparency. Transparent AVIF pixels are composited over your chosen background color.
Sizing: Set width and/or height. If one is blank, the tool preserves aspect ratio. Choose how the image fits (Contain/Cover/Stretch).
AVIF support: If loading fails, your current browser/OS might not decode AVIF. Try an up-to-date Chromium/Firefox/Safari.
Large images: Extremely large outputs can exhaust memory. Keep outputs under ~8000 px per side for safety.
Color fidelity: BMP is uncompressed 24-bit BGR; files are larger than PNG/JPEG but widely compatible on Windows.

Why not use toDataURL('image/bmp')?

Most browsers don't expose BMP encoders via canvas. This tool implements a lightweight 24-bit BMP encoder directly on the pixel data.