Free Core Web Vitals Checker - Monitor LCP, CLS, INP

Real-time Core Web Vitals monitoring tool. Track LCP, CLS, FCP, TTFB, and INP. Get optimization recommendations for better rankings.

What are Core Web Vitals?

Core Web Vitals are a set of metrics that Google uses to measure user experience on websites. These metrics became official ranking factors in 2021 and directly impact your search visibility.

Google focuses on three main metrics: Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), and Interaction to Next Paint (INP). Together, they measure loading performance, visual stability, and interactivity.

Core Web Vitals Metrics Explained

imageLargest Contentful Paint (LCP)

What it measures: Loading performance - how long it takes for the largest content element to appear on screen.

Good
≤ 2.5s
Needs Work
2.5s - 4s
Poor
> 4s

How to improve: Optimize images, remove render-blocking resources, use CDN, implement lazy loading

view_compactCumulative Layout Shift (CLS)

What it measures: Visual stability - how much content shifts unexpectedly during page load.

Good
≤ 0.1
Needs Work
0.1 - 0.25
Poor
> 0.25

How to improve: Set image dimensions, reserve space for ads, avoid inserting content above existing content

touch_appInteraction to Next Paint (INP)

What it measures: Responsiveness - how quickly the page responds to user interactions.

Good
≤ 200ms
Needs Work
200ms - 500ms
Poor
> 500ms

How to improve: Minimize JavaScript execution, break up long tasks, optimize event handlers

Additional Performance Metrics

First Contentful Paint (FCP)

Time until first text or image appears. Target: under 1.8 seconds.

Time to First Byte (TTFB)

Server response time. Target: under 600ms.

Why Core Web Vitals Matter for SEO

  • trending_upRanking factor: Google uses Core Web Vitals as a ranking signal
  • personUser experience: Better metrics = better UX = higher engagement
  • shopping_cartConversions: Faster sites convert better (53% of mobile users abandon slow sites)
  • smartphoneMobile-first: Critical for mobile search rankings

Monitor Your Core Web Vitals

Get real-time Core Web Vitals monitoring with historical data and optimization recommendations.