Compress WebP Online Free: Upgrade from WebP to Smaller AVIF Files
WebP already beats JPEG on compression. AVIF beats WebP by a further 20 to 35%. If you are already serving WebP images and want to go further, converting WebP to AVIF is the next step in web image optimization.
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Compress WebP FreeConverts WebP to AVIF. Batch upload supported. Free with no sign-up.
WebP vs AVIF: How Much Further Can You Compress?
WebP uses intra-frame coding from the VP8 video codec. AVIF uses the far more advanced AV1 codec, which was developed a decade later with vastly more sophisticated prediction, transform, and entropy coding tools. The gap in compression efficiency is 20 to 35% at equivalent visual quality.
| Image Type | WebP Size | AVIF Size | Additional Saving |
|---|---|---|---|
| Outdoor photograph | 62 KB | 40 KB | -35% |
| Product shot | 38 KB | 26 KB | -32% |
| Portrait | 55 KB | 38 KB | -31% |
| Graphic / illustration | 18 KB | 14 KB | -22% |
| Hero banner | 90 KB | 60 KB | -33% |
For photographic content, AVIF delivers 30 to 35% smaller files than WebP at the same visual quality. For flat graphics, the gain is smaller but still meaningful at 20 to 25%.
Should You Switch from WebP to AVIF?
If your site already serves WebP, switching to AVIF is a worthwhile next step. The main considerations are:
Reasons to switch
- 30% smaller files on the same server, no hardware change needed
- Better visual quality at the same file size, especially at low bit rates
- AVIF supports HDR and 10-bit color, WebP does not
- Browser coverage is now comparable (both over 95%)
When to wait
- Your server encodes images on the fly and AVIF encoding is too slow for real-time use
- Your CDN or image service does not yet support AVIF output
- Your audience has a high proportion of Safari 15 or earlier users (less than 5% of most audiences)
Serving AVIF with WebP Fallback
Use the <picture> element to serve AVIF to supporting browsers and WebP to the rest:
<picture> <source srcset="image.avif" type="image/avif"> <source srcset="image.webp" type="image/webp"> <img src="image.jpg" alt="Description" width="800" height="600"> </picture>
This delivers AVIF to Chrome, Firefox, and Safari 16+, WebP to Safari 14-15, and JPEG to any remaining older browser. All three formats display identically to the user.
Convert WebP to Smaller AVIF
Upload WebP images and get AVIF files that are 30% smaller. Free, instant, batch supported.
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