WebP or AVIF: which image format should you choose?
Choose by browser support, encoding cost, transparency, and real file testing.
Choose WebP when broad compatibility and quick production matter; consider AVIF when higher compression potential justifies a supported workflow. Do not assume one is smaller—encode the same source in both formats and compare visible quality with file size.
What changed in this update?
Format selection now relies on real testing instead of one universal percentage claim.
When is WebP more practical?
WebP has broad modern browser support, handles photos and transparency, and is often faster to encode on the client. Test older design and desktop software separately.
When can AVIF help?
AVIF can produce smaller files for photos and gradients, but encoding time and export support vary. Critical images need a fallback and real-device testing.
How should quality be tested?
Keep pixel dimensions and color space stable, record file size, and inspect edges and texture at 100% and 200% zoom. The same numeric quality setting does not represent the same visual quality across formats.
Frequently asked questions
Will every PNG be smaller as WebP?
No. Tiny icons and already optimized assets may stay the same size or grow.
Can every browser export AVIF?
Viewing support is broad, but AVIF canvas export still varies by browser.