RankingsFactor
Google Standards

Core Web Vitals Checker & Diagnostics

In-browser Core Web Vitals diagnostic. Evaluates official Google thresholds for LCP, INP, and CLS, along with Navigation Timing, long tasks, and layout shift diagnostics.

Inspect Website Core Web Vitals Readiness

Enter your website domain to compare against official Google Core Web Vitals benchmarks.

Enter a domain (e.g. example.com) or full URL (e.g. https://example.com/page)
Quick test:
Core Web Vitals Browser Environment Transparency: Measured in this browser session (Local Lab Diagnostic) using W3C Performance APIs. This represents local client rendering and network response, NOT Google Chrome User Experience Report (CrUX) 28-day field data. To audit unrestricted multi-page sites and deep crawl trees, use RankingsFactor's full platform.
Full Search Intelligence Platform

Continuous Real-User CrUX Monitoring

Browser test diagnostics evaluate one session. RankingsFactor integrates with Google Search Console and Chrome UX Report APIs to monitor page experience and slow LCP URLs across your entire domain.

Deep multi-page crawl • AEO answer engine tracking • Google Search Console sync

Understanding Google's Core Web Vitals

Core Web Vitals are a standardized set of user-experience metrics published by Google to measure loading performance, interaction responsiveness, and layout stability. Passing the 75th percentile across all three metrics is an official Google search ranking signal.

Largest Contentful Paint (LCP)

LCP measures when the largest visual block above the fold finishes rendering. Optimize LCP by preloading your primary hero image and utilizing next-gen formats like WebP or AVIF.

Interaction to Next Paint (INP)

INP replaced FID in March 2024 to measure interaction responsiveness throughout the entire page lifecycle. Avoid long JavaScript tasks (>50ms) that freeze the main UI thread.

Cumulative Layout Shift (CLS)

CLS quantifies sudden visual jumps during page load. Prevent CLS by reserving space with explicit width and height attributes on all media and dynamic ad slots.

Frequently Asked Questions

Technical specifications, limitations, and SEO recommendations.

The three official Core Web Vitals are Largest Contentful Paint (LCP, measures perceived loading speed, threshold ≤ 2.5s), Interaction to Next Paint (INP, measures responsiveness, threshold ≤ 200ms), and Cumulative Layout Shift (CLS, measures visual stability, threshold ≤ 0.1).

Related Free SEO Tools

Continue auditing your website signals with complimentary diagnostic utilities.

Website SEO Audit

Perform a multi-vector page-level audit of technical security, metadata, and asset health.

Run tool

Robots.txt Generator

Create, configure, and validate custom robots.txt crawl directives and sitemap declarations.

Run tool

XML Sitemap Generator

Format and generate compliant XML sitemaps adhering to Sitemaps.org 0.9 protocol standards.

Run tool