Convert GIF to AVIF

Convert GIF to AVIF online, free and 100% in your browser. No upload, no signup, no size limit — WebAssembly does the work on your device.

How to convert an image

  1. Drop or pick your GIF file — or paste it with Ctrl/⌘+V.
  2. AVIF is already selected as the target; tune the quality slider if you like (default 60).
  3. Convert, compare the before/after, and download. Animated GIFs are split into one AVIF image per frame and packed as a ZIP.

Why convert to this format?

GIF is a 256-color format best known for simple animations, but heavy and low-fidelity for photos. AVIF is the newest AV1-based format — the smallest files of all, with transparency and wide-gamut color.

OptImg runs the same Rust codecs desktop tools use, compiled to WebAssembly, so you get desktop-grade AVIF output at a sensible default (quality 60) — adjustable at any time — without ever uploading your image.

Everything happens locally: your GIF is decoded, re-encoded to AVIF and handed straight back as a download. No server sees a single byte, which is why there's no queue and no file-size cap.

Frequently asked questions

Is my GIF uploaded to a server?
No. The GIF-to-AVIF conversion runs entirely in your browser with WebAssembly — your file never leaves your device, there is no queue, and no size limit beyond your device's memory.
What happens to an animated GIF?
Each frame is extracted and converted to a separate AVIF image, then delivered together as a ZIP — the classic GIF-to-AVIF behavior. Animated AVIF output isn't supported yet.
Why is AVIF slower than the other formats?
AVIF uses the AV1 video codec, which trades encode time for the smallest files. Small images finish in a moment; very large photos can take a minute or more — the tool warns you first and you can cancel anytime.
Will converting GIF to AVIF lose quality?
AVIF is lossy, tuned to a visually transparent default (quality 60) that you can raise or lower with the slider. If the conversion can't produce a smaller file than your original, we hand the original back instead.