WebP vs AVIF for websites
Compare delivery formats while keeping upload support, encoding and visual inspection separate.
Reviewed by HSQ Tools ·
Compare the same source
Export both candidates from the same original and at the same dimensions. Encoder quality numbers are not a shared visual scale: WebP quality 90 and AVIF quality 90 do not mean identical appearance. Check fine detail, gradients and transparent edges before comparing byte sizes.
A smaller candidate is useful only if the visual tradeoff suits that image. Do not choose a site-wide winner based on one photograph; include screenshots, logos and any images containing text.
Delivery and upload support are different
Current browser support can be checked in the linked format reference, but the CMS, email client or marketplace receiving the file may have its own restrictions. Try an actual upload before converting a library. For websites you control, a picture element can provide alternate sources and a compatible fallback.
Neither an AVIF nor a WebP export automatically configures responsive delivery, caching or image loading on your website. Those are separate tasks. HSQ produces downloadable files.
HSQ export boundaries
In Image Converter, WebP export uses lossy quality 90 and can write decoded animation frames with an infinite loop setting. AVIF export writes the first decoded frame at quality 90 and requires the server encoder to be available.
If you need a still image, compare both results visually. If you need animation, do not assume that the format specification means this particular exporter preserves it. Keep your source and verify frame behavior in the application where the file will be used.
Compare exports before choosing a default
Export one representative photo and one graphic from the same originals to WebP and AVIF. Record their downloaded sizes and inspect them at the actual display dimensions. These tools use different fixed encoders, so a matching quality number would not mean matching visual quality.
Test the files in your CMS as well as the browser. If the CMS rejects AVIF, keep WebP or another accepted format. If one result shows banding, retain the better-looking result even when it is larger; a format label alone is not a quality measurement.