Core Web Vitals Checker

Analyze your website's performance with Google's Core Web Vitals metrics. Get instant insights on LCP, INP, and CLS with actionable recommendations.

Check Your Website

Enter the full URL including https://
Mobile is tested by default (mobile-first indexing)

What are Core Web Vitals?

  • LCP (Largest Contentful Paint): Loading performance - measures when the largest content element becomes visible
  • INP (Interaction to Next Paint): Interactivity - measures responsiveness to user interactions
  • CLS (Cumulative Layout Shift): Visual stability - measures unexpected layout shifts

Analysis Results

Enter a URL and click "Analyze" to see results

Understanding Core Web Vitals

🎯 Why Core Web Vitals Matter

Core Web Vitals are essential SEO ranking factors that measure user experience. Google uses these metrics to determine page quality and rank search results.

  • Direct impact on search rankings
  • Improve user satisfaction and engagement
  • Reduce bounce rates and increase conversions
  • Mobile-first indexing requirement

📊 How to Improve LCP

Largest Contentful Paint measures loading performance. Target: under 2.5 seconds.

  • Optimize and compress images (WebP/AVIF)
  • Minimize server response time (TTFB)
  • Remove render-blocking resources
  • Use a CDN for faster content delivery
  • Implement lazy loading for images

⚡ How to Improve INP

Interaction to Next Paint measures responsiveness. Target: under 200 milliseconds.

  • Minimize JavaScript execution time
  • Break up long tasks into smaller chunks
  • Optimize third-party scripts
  • Use web workers for heavy computations
  • Defer non-critical JavaScript

🎨 How to Improve CLS

Cumulative Layout Shift measures visual stability. Target: under 0.1.

  • Set width and height on images and videos
  • Reserve space for ads and embeds
  • Use font-display: swap for web fonts
  • Avoid inserting content above existing content
  • Use CSS aspect-ratio for responsive elements

Frequently Asked Questions

How often should I check Core Web Vitals?

Check Core Web Vitals monthly or after making significant changes to your website. Monitor consistently to track improvements and catch regressions early.

Why are my results different from Google Search Console?

Google Search Console shows real user data (field data) collected over 28 days, while this tool uses lab data from a single test. Both are valuable but measure different things.

What's a good Core Web Vitals score?

Aim for "Good" ratings on all three metrics: LCP under 2.5s, INP under 200ms, and CLS under 0.1. This puts you in the top 75% of real-world page loads.

Should I test mobile or desktop?

Test mobile first, as Google uses mobile-first indexing. Mobile performance is typically worse than desktop, so optimizing for mobile improves both.

How long does analysis take?

Analysis typically takes 10-30 seconds. The tool loads your page multiple times to collect accurate performance data.

Need Help Improving Your Core Web Vitals?

Our SEO experts can audit your website and implement performance optimizations

Get Expert Help