Readiness check · Accelerate lane · weight 6

Modern image formats in use

On a homepage with at least three images, some images use WebP or AVIF (by file type, a <source> type, or an image-CDN format parameter).

Why it matters

WebP and AVIF are typically much smaller than JPEG or PNG at similar quality, and images are often the heaviest part of a page.

Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

On a homepage with at least three images, some images use WebP or AVIF (by file type, a <source> type, or an image-CDN format parameter).

Observed: WebP or AVIF images detected.

Not observed: No WebP or AVIF images detected.

Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

WordPress: WordPress has supported WebP uploads since 5.8 and AVIF since 6.5; image plugins or the host can convert existing images.
Next.js: The next/image component serves optimized formats automatically.
Nuxt: Nuxt Image can output WebP and AVIF.
Cloudflare: Cloudflare Polish can convert images to WebP.
Vercel: Vercel Image Optimization serves modern formats.
Shopify: Shopify's image CDN can serve modern formats; follow Shopify's web performance guidance for themes.