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, so conversions are quick.

Will AVIF be smaller than my JPG?

Usually yes. AVIF often beats JPG by 30 to 50% at matched quality. Re-encoding a JPG won't recover lost detail, but it will shrink the file.

JPG to AVIF

Match the JPG's quality and AVIF comes out smaller than the original.

What this does

This decodes each JPG and re-encodes the pixels as AVIF with a WebAssembly AV1 encoder. Match the JPG's quality and the AVIF comes out smaller than the original. Re-encoding can't recover detail the JPG already discarded, but it does shrink the file.

How it works

1Drop your JPG 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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