Core Web Vitals

Lighthouse Viewer

Run a live Lighthouse audit or upload a report to explore performance, accessibility, SEO and best-practice scores in one dashboard.

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About this tool

Comprehensive documentation & audit utility guide
Verified Utility

The Lighthouse Viewer runs Google's actual Lighthouse engine — the same tool behind PageSpeed Insights and Chrome DevTools — against a live URL, using a real headless Chrome instance in a dedicated cloud function. You can also upload an existing Lighthouse JSON report to explore it without re-running an audit.

How it works
1
Enter a URL

Or upload a Lighthouse JSON report you already have.

2
Chrome runs the audit

A real headless Chrome instance loads the page and Lighthouse measures it.

3
Explore the results

Scores, Core Web Vitals, opportunities and diagnostics in one dashboard.

What it checks
Performance, Accessibility, Best Practices and SEO category scores
Core Web Vitals: Largest Contentful Paint, Cumulative Layout Shift, Total Blocking Time
Opportunities (specific ways to improve) and diagnostics
Network requests, console errors, third-party impact and more