AVIF to WebP Converter

AVIF is the most efficient common image format, but some editors, content management systems, messaging apps and older devices still cannot open it, while WebP is supported far more widely. This converter decodes each AVIF with your browser's built-in decoder and saves a WebP — lossy at the quality you choose, or lossless — keeping transparency.

How to use this tool

1. Drop one or more .avif files.
2. Set the WebP quality, or tick lossless.
3. Optionally set a max size.
4. Download the WebP files and compare the sizes.

Formula

Size change = (WebP bytes ÷ AVIF bytes − 1) × 100%. AVIF decoding needs Chrome 85+, Edge 121+, Firefox 93+ or Safari 16.4+.

Expect the WebP to be larger than the AVIF: AVIF (AV1) usually compresses better than WebP (VP8) at the same visual quality, so converting trades some size for compatibility. HDR or 10-bit AVIF is mapped to 8-bit sRGB by the browser. Animated AVIF gives its first frame. Metadata is not copied.

Example

If a 90 KB AVIF photo becomes a 126 KB WebP at quality 80, the size change is 126 ÷ 90 − 1 = +40%, shown under the file — the price of a format more programs can open. Lowering the quality to 70 or setting a max size brings it down.