Lighthouse test online
Run a full Google Lighthouse report without DevTools: performance, accessibility, best practices and SEO scores, every failed audit, and a filmstrip of the load, on mobile and desktop at once.
Runs Google Lighthouse on mobile and desktop at the same time, plus real-user Chrome data. Takes about 20–40 seconds.
What a Lighthouse report checks
Performance is a weighted score from five lab metrics (see how it is calculated). The other three categories are mostly pass/fail audits, weighted and averaged:
- Accessibility: automated checks from the axe-core library, such as colour contrast, image alt text, form labels, heading order and ARIA use. Automated checks catch roughly a third of real accessibility issues, so a 100 is a floor, not a guarantee.
- Best practices: HTTPS, no browser console errors, no deprecated APIs, correctly sized images and safe third-party links.
- SEO: basic crawlability, such as a title and meta description, a valid robots.txt, links with descriptive text, indexable status and legible font sizes on mobile.
Running Lighthouse yourself
For pages that aren’t public, run it locally: open Chrome DevTools, choose the Lighthouse panel, and click Analyze page load. Use an Incognito window so extensions don’t skew the result. For CI, the lighthouse npm package and Lighthouse CI can fail a build when a score drops.
Questions people ask
Is this the same as running Lighthouse in Chrome DevTools?
It is the same Lighthouse engine, run by Google’s PageSpeed Insights servers instead of your computer. Scores can differ from DevTools because your machine, extensions and network differ; server-side runs are more consistent between people.
Which Lighthouse categories are included?
Performance, Accessibility, Best Practices and SEO. The Progressive Web App category was removed from Lighthouse in version 12.
Can I run a Lighthouse test without installing anything?
Yes. Enter the URL above and the test runs remotely. You don’t need Chrome, Node or a browser extension.
What’s a good Lighthouse score?
90–100 is good, 50–89 needs improvement, 0–49 is poor, for each category. Mobile performance scores are usually much lower than desktop because of the throttled test device.