Docs · Images
Next-gen image formats
Images use next-gen formats (WebP/AVIF)
What this check looks at
Optia checks whether the page's images are served as WebP or AVIF rather than legacy JPEG/PNG.
Why it matters
WebP and AVIF compress 25–50% smaller than JPEG at the same visual quality. Smaller images mean faster Largest Contentful Paint, and page speed is both a ranking factor and a conversion factor.
How to fix it
- Convert photos to WebP or AVIF in your build pipeline, CDN, or image CMS.
- Use
<picture>with a legacy fallback if you must support very old browsers. - Keep SVG for icons and line art — it's already the right tool there.