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Free Core Web Vitals Checker

Test LCP, INP & CLS in 30 seconds. Get prioritized fixes with code.

✓ LCP, INP & CLS scores • ✓ Prioritized fix list • ✓ 100% free

The 3 Core Web Vitals Google Measures

LCP
Largest Contentful Paint

How fast does the main content load?

✓ Good < 2.5s
⚠ Needs work 2.5-4s
✗ Poor > 4s
INP
Interaction to Next Paint

How fast does the page respond to clicks?

✓ Good < 200ms
⚠ Needs work 200-500ms
✗ Poor > 500ms
CLS
Cumulative Layout Shift

Does content jump around while loading?

✓ Good < 0.1
⚠ Needs work 0.1-0.25
✗ Poor > 0.25

Common Core Web Vitals Fixes

🔵 LCP Fixes

  • • Optimize hero images (WebP, proper sizing)
  • • Preload critical resources
  • • Remove render-blocking JavaScript
  • • Use a CDN for static assets

🟣 INP Fixes

  • • Break up long JavaScript tasks
  • • Defer non-critical scripts
  • • Reduce third-party script impact
  • • Use requestIdleCallback for heavy work

🟠 CLS Fixes

  • • Set explicit width/height on images
  • • Reserve space for ads and embeds
  • • Avoid inserting content above existing content
  • • Use font-display: swap with fallback fonts

🔧 Quick Wins

  • • Enable GZIP/Brotli compression
  • • Implement browser caching
  • • Lazy load below-fold images
  • • Minimize CSS and JavaScript

Why Core Web Vitals Matter for SEO

Core Web Vitals became a Google ranking factor in June 2021. While content relevance remains the primary ranking signal, CWV acts as a tiebreaker between pages with similar content quality.

The real impact: For competitive keywords where multiple pages satisfy user intent equally well, the page with better Core Web Vitals will rank higher. This is especially true for:

  • E-commerce category pages
  • Local service pages (lawyers, plumbers, etc.)
  • News and content sites
  • Any page competing for high-volume keywords

Beyond rankings, poor CWV directly hurts conversions. A 1-second delay in page load time can reduce conversions by 7%.

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Frequently Asked Questions

What are Core Web Vitals? ▼
Core Web Vitals are three specific metrics Google uses to measure user experience: LCP (Largest Contentful Paint) measures loading speed, INP (Interaction to Next Paint) measures interactivity, and CLS (Cumulative Layout Shift) measures visual stability. These are confirmed ranking factors since 2021.
What are good Core Web Vitals scores? ▼
Good scores: LCP under 2.5 seconds, INP under 200 milliseconds, CLS under 0.1. Needs Improvement: LCP 2.5-4s, INP 200-500ms, CLS 0.1-0.25. Poor: LCP over 4s, INP over 500ms, CLS over 0.25. Aim for "Good" on all three metrics.
How is this different from PageSpeed Insights? ▼
PageSpeed Insights shows raw scores but often leaves developers confused about what to fix. Our checker combines lab data with field data analysis, prioritizes fixes by impact, and provides copy-paste code for the most common issues like lazy loading, font optimization, and layout shift prevention.
Why did Google replace FID with INP? ▼
FID (First Input Delay) only measured the first interaction. INP (Interaction to Next Paint) measures ALL interactions throughout the page lifecycle, giving a more complete picture of responsiveness. Google made INP the official metric in March 2024.
Do Core Web Vitals affect rankings? ▼
Yes, Core Web Vitals are a confirmed ranking factor. However, they act as a tiebreaker—content relevance still matters most. If two pages have similar content quality, the one with better CWV will rank higher. For competitive keywords, CWV can make the difference between page 1 and page 2.
How often should I check Core Web Vitals? ▼
Check after any significant site changes (new features, theme updates, adding scripts). For ongoing monitoring, weekly checks are sufficient. Google Search Console provides 28-day rolling CWV data which updates daily. Our tool gives instant lab measurements for immediate feedback.

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