Lighthouse

What is Lighthouse?

If you want to know where your website stands technically, Lighthouse is the best starting point. Scores from 0 to 100 immediately reveal action needed for performance, SEO, and accessibility. Since Google uses the same metrics for rankings, a high Lighthouse score is a reliable indicator of technical ranking potential.

Lighthouse is an open-source tool from Google for automated analysis and evaluation of webpages across performance, accessibility, SEO, and best practices. The tool generates detailed reports with scores (0–100) for various areas and provides concrete recommendations for improvement. Lighthouse is available for free through the browser (Chrome DevTools) or via the command line and has become the standard diagnostic tool for web developers and SEOs.

Technically, Lighthouse analyzes a website through automated audits: it crawls the page, runs Lighthouse tests, measures performance metrics (LCP, FID, CLS, etc.), checks user experience on mobile, verifies accessibility (WCAG guidelines), examines SEO aspects (meta tags, structure, mobile-friendliness), and checks best practices (HTTPS, password input fields, etc.). The tool is based on the same standard metrics that Google uses for rankings, which is why a high Lighthouse score is a good indicator of strong ranking potential.

In SEO practice, you should use Lighthouse regularly, especially after changes to the website: a score of 90+ for performance is ideal, 80–89 is good, and below 80 should be optimized. Performance recommendations are often concrete and actionable: “optimize images and use modern formats,” “minify JavaScript,” “remove unused CSS.” Accessibility audits also help with SEO, since Google values a good user experience for all users. Lighthouse reports can also be integrated into automated CI/CD pipelines to continuously monitor quality.