Why AVIF, and why still?
AVIF stores images with the AV1 codec, giving dramatically smaller files than GIF, PNG or JPG at the same visual quality, plus full alpha and HDR. It’s an excellent format for website images, thumbnails and poster frames. Quality 60–75 is usually indistinguishable from the original for web use.
Animated AVIF exists, but browser-side encoders can’t produce it reliably yet, so this tool creates a still from the frame you choose. If you need the whole animation small, GIF to MP4 is the most compact and compatible choice; GIF to APNG keeps transparency.
Related formats
Need the result as HEIF for Apple devices? GIF to HEIF packages the same AV1 image as a HEIF file. Converting the other way, AVIF to GIF handles both still and animated AVIFs, and GIF to PNG gives a universally compatible lossless still.