Quick Reference
Element Code: PE-015
Issue: Images use older formats (JPEG, PNG) instead of modern formats
Impact: Larger file sizes than necessary with modern formats
Fix: Convert images to WebP or AVIF where supported
Detection: Lighthouse, PageSpeed Insights
What Is This Issue?
WebP and AVIF provide significantly better compression than JPEG and PNG. WebP typically offers 25-35% smaller files than JPEG at equivalent quality.
Why This Matters for Your Website
Modern image formats offer the best file size to quality ratio. With over 95% browser support for WebP, there is little reason not to use it.
How to Fix This Issue
- Convert to WebP: Use Squoosh, cwebp, or image CDN
- Use picture element: Provide fallbacks for older browsers
- Consider AVIF: Even better compression where supported
Tools for Detection
- Squoosh: Convert and compare formats
- Lighthouse: Identifies format opportunities
TL;DR (The Simple Version)
Your images use old formats like JPEG. Convert them to WebP for 25-35% smaller files with the same quality. Use the picture element for fallbacks.
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