What about animated GIFs?

Only the first frame converts. The output is a still AVIF, so animation isn't kept.

Why is the file so much smaller?

GIF caps out at 256 colors and uses old compression. AVIF gives you full color and modern encoding, so most images shrink a lot.

GIF to AVIF

Grabs the first frame of a GIF and writes it as AVIF. Animation is dropped.

What this does

This decodes a GIF and re-encodes its first frame as a still AVIF using a WebAssembly AV1 encoder. Animation is dropped, but the output trades GIF's 256-color cap and dated compression for AVIF's full color and modern encoding, so most images shrink a lot.

How it works

1Drop your GIF 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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