AVIF is the smallest of the mainstream image formats at a given quality, at the cost of slower encoding and less universal support.
—
80
Resize
50
Encoder detail
6
fastzopfli
256
28
0 lossless51 tiny
The largest saving available.
50
Speed, audio and advanced
8
0 smallest13 fastest
128
96
Advanced
8
Nearly all of the saving comes from the images inside.
150
75
Advanced
50
aggressivegentle
Advanced
14
coarsefine
0 merges only exactly equal vertices. A small value also closes hairline cracks left by CAD exporters.
Geometry only — texture coordinates,
materials and vertex colours are not carried through. Decimating a
UV-mapped mesh correctly is a much harder problem, and mangling your
UVs quietly would be worse than leaving them alone.
12
6
Advanced
ZIP and 7z. 7z encrypts the file list too.
What actually shrinks AVIF files
Encoded by your browser's AV1 image encoder. Chrome and Firefox handle this; older Safari versions do not, and the tool tells you rather than failing quietly.
Expect meaningfully smaller files than WebP on photographic content, especially at low quality settings.
Auto mode will not pick AVIF for you unless it genuinely wins on your image.