Core Web Vitals Checker
Evaluate your website against Google's Core Web Vitals metrics — LCP, FID, CLS, INP, and TTFB — which are direct ranking factors in Google Search. Core Web Vitals measure real-world page experience: how fast the page visually loads, how quickly it responds to user interaction, and how stable the layout is during loading. Poor Core Web Vitals can negatively impact your search rankings, especially in competitive niches. Each metric is scored as Good, Needs Improvement, or Poor with color-coded indicators and specific, actionable recommendations to fix any failing metrics.
Core Web Vitals Checker
Check all Core Web Vitals metrics and get improvement recommendations.
How to Use Core Web Vitals Checker
- 1Enter your website URL in the input field
- 2Click "Check Core Web Vitals" to analyze the page
- 3Review each metric score (LCP, FID/INP, CLS, TTFB) with Good/Needs Improvement/Poor status
- 4Read the recommendations for any metrics rated Poor or Needs Improvement
- 5Prioritize fixing Poor metrics first as they have the greatest ranking impact
About Core Web Vitals Checker
Evaluate your website against Google's Core Web Vitals metrics — LCP, FID, CLS, INP, and TTFB — which are direct ranking factors in Google Search. Core Web Vitals measure real-world page experience: how fast the page visually loads, how quickly it responds to user interaction, and how stable the layout is during loading. Poor Core Web Vitals can negatively impact your search rankings, especially in competitive niches. Each metric is scored as Good, Needs Improvement, or Poor with color-coded indicators and specific, actionable recommendations to fix any failing metrics.
Your Privacy is Protected
Core Web Vitals Checker runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
What is LCP (Largest Contentful Paint)?
LCP measures how long it takes for the largest visible image or text block to fully load and render. Good LCP is under 2.5 seconds. Poor LCP (over 4 seconds) frustrates users and harms rankings.
What is CLS (Cumulative Layout Shift)?
CLS measures visual instability — how much page elements unexpectedly shift during loading. A button jumping as a late-loading ad pushes it down is a classic CLS issue. Good CLS is under 0.1.
What is INP (Interaction to Next Paint)?
INP replaced FID in March 2024 as a Core Web Vital. It measures the overall responsiveness of a page to user interactions — how long it takes for the page to visually respond after a click, tap, or keypress. Good INP is under 200ms.
Do Core Web Vitals directly affect Google rankings?
Yes. Since May 2021, Core Web Vitals have been a direct ranking signal in Google Search as part of the Page Experience update. Pages with Good scores across all three metrics have a ranking advantage over pages with Poor scores, all else being equal.
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