Why does the first conversion take a moment?

The AVIF encoder is about 1 to 2 MB of WebAssembly and downloads the first time you use it. After that it's cached and conversions are fast.

Will AVIF really be smaller than WebP?

Often yes, especially on photographs. The gain is smaller than it is against JPG, but at matched quality AVIF usually edges out WebP.

WEBP to AVIF

Re-encodes WebP as AVIF, which ends up even smaller.

What this does

This decodes each WebP and re-encodes the pixels as AVIF with a WebAssembly AV1 encoder. At a matched quality, AVIF usually edges out WebP on file size, especially for photographs, while keeping any transparency through AVIF's alpha channel.

How it works

1Drop your WebP images.
2Download each result, or grab them all as a zip.

Built with open source

jSquash (AVIF) — WebAssembly AVIF image encoder. · Apache-2.0

Frequently asked questions

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