Use Modern Image Formats for Better Compression and Performance

Web Vitals Analyzer

What is this warning?

Your images are using older formats like JPEG or PNG when modern formats like WebP or AVIF could provide the same quality at much smaller file sizes. This directly impacts your Largest Contentful Paint (LCP) score.

How to Fix This Issue

How to Fix It

The Problem

<img src="hero-image.jpg" alt="...">

The Solution

Use the `<picture>` element to serve modern formats with fallbacks.

<picture>
  <source srcset="hero-image.webp" type="image/webp">
  <img src="hero-image.jpg" alt="...">
</picture>

Why This Works

Modern image formats can be 25-50% smaller than traditional formats, significantly improving LCP and overall page performance.

SEO Impact

This issue can affect your site's search engine rankings and user experience. Addressing it promptly helps ensure optimal performance and visibility in search results.

Automatic Detection

Black SEO Analyzer automatically checks for this warning during site analysis, along with hundreds of other technical SEO issues.

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