WebP vs AVIF: Which Should You Actually Use?
Both formats crush JPEG on file size. But which one is right for your site in 2026? Short answer: AVIF for hero images and product photos where every kilobyte matters; WebP for everything else. Here's the full breakdown.
File size: AVIF wins by 20–30%
At equivalent visual quality, AVIF files are 20–30% smaller than WebP, and about 50% smaller than JPEG. On a hero image at 1920px wide, that's often the difference between 180KB (JPEG) → 110KB (WebP) → 75KB (AVIF).
Browser support: WebP wins
WebP: 96%+ global support (Safari 14+, everything else). AVIF: ~93% (Safari 16.4+, Chrome, Firefox, Edge). For sites with older Safari or in-app browsers, WebP is still safer as the default — use AVIF inside a <picture> tag with a WebP or JPEG fallback.
Encoding speed: WebP wins
AVIF encoding is 5–10x slower than WebP. For build pipelines this doesn't matter (cache it), but for on-demand tools or CMSs generating images at upload, WebP is the pragmatic default.
SEO impact: it depends on your LCP
Google doesn't care whether you use WebP or AVIF — it cares about LCP. If your Largest Contentful Paint is your hero image, AVIF's extra 20% savings can move you from 'needs improvement' to 'good' in Core Web Vitals. If your LCP is text or an already-small image, WebP is fine.
The pragmatic recommendation
Serve AVIF for hero + above-the-fold product images (via <picture>), WebP for everything else, JPEG as final fallback. AltPixel converts to either with one click.
Frequently asked questions
Is AVIF better than WebP for SEO?
Only if image weight is your bottleneck. Both format changes help Core Web Vitals; AVIF just helps more when your hero image is what's slowing down LCP.
Does Google prefer WebP or AVIF?
Neither. Google's PageSpeed Insights recommends 'next-gen formats' generically — WebP and AVIF both qualify.
Can I use AVIF without a fallback?
Not safely — about 7% of visitors (mostly older iOS Safari) can't decode it. Always wrap in <picture> with a WebP or JPEG source.
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