Core Web Vitals Checker
Audit any website's SEO, performance, and accessibility with Google Lighthouse scores, Core Web Vitals, and detailed on-page HTML analysis. Free, fast, and runs 100% in your browser.
Core Web Vitals (LCP, FID/INP, CLS) are Google ranking signals that measure real user experience. This checker analyzes any website using the PageSpeed Insights API and shows exactly where your site needs improvement with actionable metrics.
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Website SEO & Performance Auditor
Comprehensive analysis of SEO health, performance, security, social tags, and accessibility.
Feature Overview
| Feature | Details |
|---|---|
| LCP check | ✓ |
| CLS check | ✓ |
| INP/FID check | ✓ |
| Powered by | Google PSI API |
Frequently Asked Questions
What are Core Web Vitals?
LCP (Largest Contentful Paint), FID/INP (First Input Delay / Interaction to Next Paint), and CLS (Cumulative Layout Shift) — Google's metrics for page experience.
How do I improve my LCP?
Optimize images, preload critical resources, use a CDN, and minimize render-blocking JavaScript.