Modern image format
Detects use of modern formats like WebP and AVIF.
Why does this matter?
WebP is on average 25-35% smaller than JPEG at equal quality. AVIF is even more efficient. Modern formats reduce page weight, speed up load time and improve Core Web Vitals scores.
How to fix it?
Convert JPEG/PNG images to WebP or AVIF. Use <picture> with multiple sources as fallback for older browsers. Tools like Squoosh, ImageOptim or Sharp (Node.js) do this automatically.
This check scores from 0 to 100. Below 50 is a fail, 50 to 89 is a warning, 90 or above is good. After each crawl you see the score per page in your report, with a short note on what we found.
Frequently asked questions
Detects use of modern formats like WebP and AVIF.
WebP is on average 25-35% smaller than JPEG at equal quality. AVIF is even more efficient. Modern formats reduce page weight, speed up load time and improve Core Web Vitals scores.
Convert JPEG/PNG images to WebP or AVIF. Use <picture> with multiple sources as fallback for older browsers. Tools like Squoosh, ImageOptim or Sharp (Node.js) do this automatically.
Example
Copy the code below and adapt the domain name, brand name and content to your situation.
<picture> <source srcset="hero.avif" type="image/avif"> <source srcset="hero.webp" type="image/webp"> <img src="hero.jpg" alt="Hero"> </picture>