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ToolsCore Web Vitals
SEO AnalysisFree Tool

Core Web Vitals

Check if your page passes Google

Test Vitals

What Are Core Web Vitals?

Core Web Vitals are a set of three specific metrics that Google uses to evaluate real-world user experience. They are a confirmed ranking factor as part of Google's Page Experience update, designed to ensure websites provide a fast, responsive, and stable experience for visitors.

  • LCP (Loading): Measures how long the main content takes to load. Target: ≤2.5 seconds.
  • INP (Interactivity): Measures responsiveness to user interactions. Target: ≤200 milliseconds.
  • CLS (Stability): Measures visual stability — how much content shifts around during loading. Target: ≤0.1.

Why Monitor Page Speed & Vitals?

Poor Core Web Vitals don't just hurt your rankings — they directly impact user engagement, bounce rates, and conversion rates. Searchers expect pages to load instantly and behave predictably.

Users are 24% less likely to abandon page loads when Core Web Vitals are good. Pages that pass see up to 15% higher conversion rates across the board.
Lab vs Field Data
Lab data is simulated; Field data comes from real users (CrUX). Google uses field data for ranking signals.
Performance Budget
Maintain a

Best Practices for Optimization

Passing the Core Web Vitals assessment requires a combination of technical optimizations and efficient asset management:

  • Optimize LCP: Use modern formats like WebP or AVIF for images and implement a robust Content Delivery Network (CDN).
  • Minimize CLS: Always specify width and height attributes for images and video elements to reserve space before they load.
  • Improve INP: Use code-splitting to reduce the size of your JavaScript bundles and break up long-running tasks.
  • Preload Critical Assets: Use rel="preload" for hero images and fonts to ensure they load as early as possible.

How to Use This Tool

Enter your website URL and click "Analyze". We'll test your page using Google's PageSpeed Insights API, providing a detailed breakdown of all Core Web Vitals metrics for both mobile and desktop devices. Toggle between views to compare performance across different platforms and identify specific areas for improvement.

Frequently Asked Questions

Core Web Vitals are a set of three specific metrics that Google uses to measure real-world user experience: LCP (loading performance), INP (interactivity), and CLS (visual stability). They are a confirmed Google ranking factor.
Lab data is collected in a controlled environment (simulated), while Field data comes from real users visiting your site (CrUX). Field data is more important for SEO as it reflects actual user experience.
In March 2024, Google replaced First Input Delay (FID) with Interaction to Next Paint (INP). INP measures all interactions throughout the page lifecycle, not just the first one.
To pass, you need: LCP under 2.5 seconds, INP under 200ms, and CLS under 0.1. Optimize images, reduce JavaScript execution time, and minimize layout shifts.

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