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Measure

Review performance and get detailed guidance on how to improve it. Sign-in to monitor your progress over time.

Audit your web page

Provide any URL, and web.dev will run a series of audits using Lighthouse. We'll generate a report of how well you did.

Analyze for improvements

Review the audits report to identify areas in which your page can be improved.

Learn how to fix it

For each audit you'll find guidance and immediate steps you can take to improve your scores.

What is Lighthouse?

Lighthouse is an open-source, automated tool for improving the quality of your web apps. It is integrated directly into the Chrome DevTools Audits panel, but can also be run from the command line, as a Node module, or by installing the Chrome Extension. Lighthouse also provides a REST API which is consumed by sites like web.dev and PageSpeed Insights.
Performance

Audits for metrics like first paint and time to interactive to determine lag.

PWA

Assesses your page against the baseline Progressive Web App Checklist.

Best Practices

Looks for everything from HTTPS usage to correct image aspect ratios.

SEO

Checks for best practices to ensure your site is discoverable.

Accessibility

Checks for common issues that may prevent users from accessing your content.