SEO Tools

Core Web Vitals Checker

Use Core Web Vitals Checker to measure Core Web Vitals and performance scores using Google PageSpeed Insights. The tool produces a vitals dashboard with LCP, INP, CLS, FCP, TTFB scores and improvement opportunities. Your URL is sent to Google's public PageSpeed Insights API. No data is stored.

Free SEO analysis No sign-up required Instant results
Powered by Google PageSpeed Insights API. Analysis may take 10–20 seconds.
Core Web Vitals
Lab Metrics

Features

  • Browser-only HTML analysis. No upload
  • Pass, warn, fail, and info status labels
  • Export report as JSON
  • Your URL is sent to Google's public PageSpeed Insights API. No data is stored.

How to use it

  1. Paste the HTML source of a page into the input panel.
  2. Click Check HTML to run the analysis in your browser.
  3. Review the report sections.
  4. Export as JSON or copy the summary.

Use cases

  • Audit on-page SEO before publishing or updating a page
  • Check social sharing metadata before a campaign
  • Verify heading structure and schema markup after a CMS change

Limitations

  • JavaScript-rendered content is not evaluated. Only the static HTML response is analysed.
  • Paste the raw HTML source. Relative paths may not resolve correctly without the original base URL.
  • Your URL is sent to Google's public PageSpeed Insights API. No data is stored.
See also

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Questions & answers

Frequently asked

Does Core Web Vitals Checker upload my data?

Your file or text is processed in your browser and is not uploaded.

What does Core Web Vitals Checker check?

It produces a vitals dashboard with LCP, INP, CLS, FCP, TTFB scores and improvement opportunities. Your URL is sent to Google's public PageSpeed Insights API. No data is stored.

Does this replace Google Search Console?

No. This tool reads static HTML and provides a quick informational check. For authoritative indexing data and crawl reports, use Google Search Console.