Performance Tools
Free interactive tools to understand and improve your Lighthouse scores.
Bulk PageSpeed Test
Test up to 10 URLs at once with PageSpeed Insights. Get performance scores for multiple pages in one batch.
Core Web Vitals Checker
Check if your page passes Google's Core Web Vitals. Test LCP, CLS, and INP with lab and real user data.
Core Web Vitals History
Track real user performance over 25 weeks. See how your LCP, CLS, and INP trends change over time with CrUX data.
TTFB Checker
Test Time to First Byte with real Chrome user data. Compare field vs lab TTFB and track server response trends.
CWV Compare
Compare Core Web Vitals across multiple websites. Benchmark your site against competitors with real Chrome user data.
Lighthouse Report Viewer
Upload your Lighthouse JSON report to visualize scores, metrics, and audits interactively.
Lighthouse Score Calculator
Calculate your performance score interactively. Adjust metrics to see how they impact your overall Lighthouse score.
LCP Element Finder
Identify which element is your Largest Contentful Paint and get actionable recommendations to improve it.
INP Analyzer
Analyze Interaction to Next Paint issues. Find slow event handlers and optimize responsiveness.
CLS Debugger
Debug Cumulative Layout Shift issues. Identify elements causing unexpected layout shifts.
HAR File Viewer
Analyze HTTP Archive files with network waterfall, request timing, resource breakdown, and protocol distribution. Entirely client-side.
JSON Size Analyzer
Calculate JSON payload size with minification savings, gzip/brotli estimates, key contributions, and duplicate key analysis. Entirely client-side.
Page Size Checker
Test page weight with resource breakdown, third-party analysis, unused code detection, and HTTP Archive percentile comparison.
PageSpeed Insights Performance
Get detailed PageSpeed Insights performance data with field and lab metrics.