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Free Core Web Vitals Check

Measure LCP, FID, and CLS, the metrics Google uses for ranking.

Performance tools

How does your site compare?

Sites passing all three Core Web Vitals thresholds see 24% fewer page abandonments compared to sites that fail.

Estimated from server response time, HTML size, script count, and image optimization signals. For precise measurements, use Google PageSpeed Insights with real user data.
Your estimated LCP is under 2.5s, layout shift risk is low, and interactivity should be responsive.

How to fix this

Improve Core Web Vitals by optimizing images, reducing JavaScript, and setting image dimensions.

  1. 1LCP: Optimize your largest above-fold image (compress, use WebP, preload with <link rel="preload">).
  2. 2LCP: Reduce server response time by enabling caching, using a CDN, and upgrading hosting if needed.
  3. 3CLS: Add width and height attributes to ALL images and videos to reserve space before loading.
  4. 4CLS: Avoid inserting content above existing content (e.g., late-loading banners or cookie bars).
  5. 5INP: Reduce JavaScript execution by removing unused scripts and code-splitting large bundles.
  6. 6INP: Defer non-critical third-party scripts (analytics, chat widgets) with async or defer attributes.

Quick tips by platform

WordPress: Install Perfmatters or WP Rocket for script management. Use ShortPixel for image optimization.
Wix: Wix handles most CWV automatically. Reduce custom code and large media files.
Squarespace: Use Squarespace's built-in image optimization. Minimize custom code injections.
Shopify: Choose a lightweight theme. Use Shopify's built-in image optimization and lazy loading.

Frequently Asked Questions

What are Core Web Vitals?
Core Web Vitals are three metrics Google uses to measure user experience: LCP (loading speed), INP (interactivity), and CLS (visual stability). They directly affect your search rankings.
What is LCP?
Largest Contentful Paint measures how long it takes for the biggest visible element (hero image, headline) to fully render. Target: under 2.5 seconds.
What is INP?
Interaction to Next Paint (replaced FID in 2024) measures how long it takes for the page to respond to user interactions like clicks and taps. Target: under 200ms.
What is CLS?
Cumulative Layout Shift measures visual stability — how much the page layout shifts while loading. Target: under 0.1. Images without dimensions and late-loading ads are common causes.
How accurate are these estimates?
We estimate Core Web Vitals from server response time, HTML analysis, and page structure. For exact field data, check Google Search Console or PageSpeed Insights, which use real Chrome User Experience data.

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