Core Web Vitals Checker
SEO ToolsAnalyze Core Web Vitals (LCP, FID, CLS) for page experience. Get actionable optimization tips.
How to use Core Web Vitals Checker
- 1Enter your input in the text area above
- 2Click the action button to process your data
- 3View the result and copy it to your clipboard
Common Use Cases
Quick Processing
Process your data quickly and efficiently.
Secure & Private
All processing happens in your browser.
Free to Use
This tool is completely free with no signup.
Mobile Friendly
Works on any device with a browser.
Frequently Asked Questions
What are Core Web Vitals?
Core Web Vitals are Google's metrics for page experience: LCP (Largest Contentful Paint - loading speed, <2.5s good), FID (First Input Delay - interactivity, <100ms good), and CLS (Cumulative Layout Shift - visual stability, <0.1 good). They're ranking factors.
How is the data collected?
We use the Chrome UX Report (CrUX) API to get real-world field data from actual users, not just lab tests. This shows how real users experience your page across different devices and network conditions.
What if my scores are poor?
For each failing metric, we provide specific, actionable recommendations: optimize images for LCP, reduce JavaScript execution time for FID, set explicit dimensions for CLS. Each tip includes implementation examples.
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