Lighthouse Report Viewer
Upload a Lighthouse JSON report to explore scores, metrics, and audits interactively.
Drop your Lighthouse JSON here
or click to browse files
How to export Lighthouse JSON:
- Open Chrome DevTools (F12)
- Go to the Lighthouse tab
- Run an audit
- Click "Export" → "Save as JSON"
How to Read a Lighthouse Report
Lighthouse audits your page across five categories. Each category receives a score from 0-100, with 90+ being good, 50-89 needing improvement, and below 50 being poor.
Focus on Performance first—it directly impacts user experience and SEO. Within Performance, prioritize the Opportunities section, which shows specific improvements with estimated savings.
Category Quick Reference
Performance
Loading speed, interactivity, visual stability
Accessibility
Screen readers, contrast, keyboard navigation
Best Practices
Security, modern APIs, image optimization
SEO
Meta tags, crawlability, mobile-friendliness
PWA
Installability, offline support, app-like experience
Pro Tips for Improving Your Score
Start with Quick Wins
Focus on opportunities with the highest estimated savings first. Image optimization and unused code are often easy fixes.
Test Multiple Times
Lighthouse scores can vary between runs. Test 3-5 times and average the results for a more accurate picture.
Prioritize Core Web Vitals
LCP, CLS, and INP directly affect search rankings. Focus on getting these green before other optimizations.
Test on Mobile
Google uses mobile-first indexing. Your mobile score matters more than desktop for SEO.
Check Field Data
Lab data (Lighthouse) is synthetic. Check Chrome UX Report for real-world user experience data.
Don't Chase 100
Diminishing returns after 90. A score of 90+ is excellent—spend time on features, not micro-optimizations.
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