Does this keep the file as AVIF?
Yes. The goal is still-image AVIF-to-AVIF recompression, not format conversion, so your output stays in the AVIF format.
Does the quality change happen locally?
Yes. Recompression, preview, and export all happen in your browser, so the AVIF is never uploaded to a server.
When should I use this instead of the compressor?
Use the recompressor when you want a manual quality slider and precise control. Use the AVIF Compressor for quick, preset-driven exports.
Is the AVIF quality recompressor free?
Yes. It is free to use with no signup, and all tuning and export happen locally in your browser.
What AVIF quality should I use?
Start at 68, which is the default. AVIF at 68 is roughly comparable to JPEG in the mid-80s: the quality numbers are not interchangeable between formats, so judge the preview rather than the figure.
What does the effort setting do?
It trades CPU time for compression efficiency. Slower searches harder for a better encode and takes longer; Faster finishes sooner and biases the quality down by about 6 points to get there.
How low can I go before it looks bad?
Somewhere around 40, AVIF starts flattening fine texture into smooth patches. It shows first on skin, fabric and foliage, and much later on flat graphics and logos.
Should I use this or the AVIF Compressor?
Use this one when you want to set the exact number and compare results yourself. Use the Compressor when you just want a smaller file and are happy with presets at 70, 56 and 42.
Why is the file barely smaller when I lower the quality?
Because it has probably been compressed already. AVIF is lossy, so a second pass on an existing AVIF gives up quality for very little size. Re-encode from the original PNG or JPG instead.