Web Vitals Analyzer
Core Web Vitals & Health Score
Get real-time analysis of LCP, FID, CLS metrics plus actionable recommendations to pass Google's Core Web Vitals assessment.
Enter the full URL including http:// or https://
Deep crawl (SEO + security audit)
Health Score & Metrics
Ready
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/100
Largest Contentful Paint (LCP)
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Loading performance
First Input Delay (FID)
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Interactivity
Cumulative Layout Shift (CLS)
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Visual stability
Actionable Insights
Analysis will appear here
Ready for Google API Integration
Add your PageSpeed Insights API key to fetch real field data. Current analysis uses intelligent simulation based on industry benchmarks.
Frequently Asked Questions
Everything you need to know about Core Web Vitals
What are Core Web Vitals?
Core Web Vitals are a set of real-world, user-centric metrics that quantify key aspects of user experience: loading (LCP), interactivity (FID), and visual stability (CLS). They're Google's ranking factors for page experience.
What are good Core Web Vitals scores?
Good scores: LCP ≤ 2.5 seconds, FID ≤ 100 milliseconds, CLS ≤ 0.1. Anything above these thresholds needs improvement to pass Google's assessment.
How can I improve my LCP?
Optimize images (WebP format, compression), upgrade hosting, implement lazy loading, eliminate render-blocking resources, and use a CDN for faster delivery.
What causes poor FID?
Heavy JavaScript execution, large main thread work, and inefficient event handlers. Break up long tasks, defer non-critical JS, and use Web Workers.
How do I fix CLS issues?
Set explicit width/height on images and embeds, reserve space for ads, avoid inserting content above existing content, and use transform animations instead of layout-triggering properties.
Can I use Google's actual API?
Yes! This tool is ready for Google PageSpeed Insights API integration. Add your API key to fetch real lab and field data from Google's CrUX report.