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Free Core Web Vitals Checker

Measure LCP, CLS, FCP, TBT and Speed Index for any URL — powered by Google PageSpeed data, free and instant.

Powered by Google PageSpeed — a full Lighthouse run takes ~20-30 seconds.

💡 Pro Tip: LCP under 2.5s and CLS under 0.1 are Google's "good" thresholds. Optimize your largest image and reserve space for dynamic content.
6
Metrics measured
Google
Lighthouse data
📱🖥️
Mobile & desktop

Why use our core web vitals?

Professional-grade results — completely free, no account required

🖼️

LCP — Loading Speed

Largest Contentful Paint measures when your main content becomes visible. Google wants under 2.5 seconds.

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CLS — Layout Stability

Cumulative Layout Shift catches annoying content jumps. A score under 0.1 keeps both Google and users happy.

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TBT — Interactivity

Total Blocking Time reveals JavaScript that freezes your page. Under 200ms is the target for a responsive feel.

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Full Performance Score

A single 0–100 Lighthouse performance score summarizes your page speed the same way Google measures it.

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Mobile & Desktop

Test both strategies separately — mobile scores are usually far worse and mobile is what Google indexes first.

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Pass/Fail Thresholds

Every metric is color-rated against Google's official good/needs-improvement/poor thresholds — no interpretation needed.

Frequently Asked Questions

Core Web Vitals are Google's official user-experience metrics — loading speed (LCP), interactivity, and visual stability (CLS). They are a confirmed ranking factor, so poor scores can hold back otherwise great content.

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