PageSpeed Insights Checker
Run Google Lighthouse audit on any URL via PageSpeed Insights API. Performance, Accessibility, Best Practices, SEO scores plus Core Web Vitals and top opportunities.
What powers the PageSpeed Insights Checker
Google PageSpeed Insights v5 API
Performance / Accessibility / Best Practices / SEO scores
Core Web Vitals: LCP, FCP, CLS, TBT, SI, TTI
Mobile and desktop strategies
Top optimization opportunities
Why the PageSpeed Insights Checker is different
Browser-native
The PageSpeed Insights Checker runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Page speed troubleshooting
- Core Web Vitals SEO compliance
- Mobile vs desktop comparison
- Performance tracking over time
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.