Lighthouse test online
A full Google Lighthouse report without DevTools: all four category scores and every failed audit, for mobile and desktop at once.
Try:
Free, no sign-up. Lighthouse on mobile and desktop at once, plus real-user Chrome data, in 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
What is Lighthouse testing?
Lighthouse is Google’s open-source tool that loads a page in a controlled Chrome browser and audits it. A Lighthouse test produces four scores from 0 to 100 (Performance, Accessibility, Best Practices and SEO) and a list of the audits the page failed, with guidance for each.
How do I run a Google Lighthouse test?
Enter a public URL above and press Run Lighthouse: Google’s PageSpeed Insights servers run it for mobile and desktop. To test a local or password-protected page, open Chrome DevTools, choose the Lighthouse panel and click Analyze page load.
How do I interpret Lighthouse results?
Start with the category score colour: green 90–100 is good, orange 50–89 needs work, red 0–49 is poor. For Performance, look at which of the five metrics is red (Total Blocking Time and LCP carry the most weight), then work down “What to fix first”, which is sorted by estimated time saved. For the other categories, fix each failed audit listed.
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.