Free Core Web Vitals & Page Speed Checker Online
Run comprehensive performance audits via Google Lighthouse to diagnose speed bottlenecks instantly.
Page Speed Checker
Live workstation with automatic local history
Recent Page Speed Checker History
0 runsHow to use the Page Speed Checker
Follow these four simple steps for instant, production-grade results.
Type or paste any publicly accessible URL into the target input box.
Select "Mobile" to test under simulated 4G mobile conditions, or "Desktop" for fast fiber connections.
Wait 5 to 10 seconds while the Lighthouse test runner fetches and evaluates the page.
Review your color-coded score cards and click the report link to inspect specific script delays.
Key Features Built for Professional Workflows
Powered by Google PageSpeed Insights v5 API for authentic Lighthouse metrics
One-click toggle between Mobile simulated throttle and unthrottled Desktop tests
Audits 4 essential pillars: Performance, SEO, Accessibility, and Best Practices
Direct deep-link to the full Google Lighthouse diagnostic trace report
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Standardize deliverables, accelerate sprint velocity, and maintain client privacy.
Benchmarking prospective client websites during pre-sales technical audits.
Validating Core Web Vitals compliance before launching redesigns into production.
Monitoring marketing landing page speeds to maximize Google Ads Quality Score.
Documenting before-and-after performance gains achieved during website speed optimization sprints.
Technical Specifications & Standards
Connects to Google PageSpeed Insights REST API endpoint (Lighthouse v11+). Evaluates First Contentful Paint (FCP), Largest Contentful Paint (LCP), Total Blocking Time (TBT), Speed Index (SI), and Cumulative Layout Shift (CLS).
Frequently Asked Questions
Why does mobile performance score lower than desktop?
Google Lighthouse mobile audits simulate a mid-tier mobile CPU with artificial network packet latency and 4G throttling. This highlights resource-heavy JavaScript execution and uncompressed assets that degrade user experience on real mobile devices.
Does this tool require registration or a credit card?
No. You can run unlimited speed audits across multiple domains without creating an account or supplying an API token.
What is considered a "good" PageSpeed score?
Scores between 90-100 are rated "Good" (green), 50-89 "Needs Improvement" (amber), and 0-49 "Poor" (red). For SEO ranking benefits, prioritize achieving an LCP under 2.5s and a CLS under 0.1.
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