Free Page Speed Test
Measure Core Web Vitals and Lighthouse scores.
What is the Page Speed Test?
Speed is a ranking factor and a conversion factor at once — every extra second of load time sheds visitors before they ever see your content, and Google now measures the experience with Core Web Vitals. The trouble is you can't feel a slow page on your own fast connection; you have to measure it.
This page speed test runs your URL through Google's Lighthouse engine and reports the scores, Core Web Vitals and the specific fixes that will make the biggest difference.
Last updated: Aug 13, 2026
What does this tool do?
You enter a URL and choose mobile or desktop, and the tool runs it through Google PageSpeed Insights, which loads the page in a controlled Lighthouse environment.
It returns performance, accessibility, best-practices and SEO scores, your Core Web Vitals (from real users where available, plus lab metrics), and a ranked list of opportunities to speed the page up.
Key features
Lighthouse scores
Performance, accessibility, best practices and SEO.
Core Web Vitals
LCP, INP and CLS — Google's experience metrics.
Mobile & desktop
Test the device that matters to your users.
Real-user field data
Chrome UX Report data when available.
Fix opportunities
Ranked by estimated time saved.
Example
Common use cases
- SEO specialists — Track Core Web Vitals that affect rankings.
- Developers — Find and fix performance bottlenecks.
- Site owners — See why a page feels slow and how to fix it.
- E-commerce teams — Speed up pages to lift conversions.
- Agencies — Benchmark and report client performance.
- Marketers — Make landing pages load fast for ad traffic.
- Performance engineers — Measure before and after optimizations.
- Anyone with a slow site — Get a concrete, prioritized fix list.
Benefits
- It measures speed objectively, not by how it feels on your machine.
- It reports the exact Core Web Vitals Google uses.
- It ranks fixes by how much time each would save.
- It tests mobile and desktop separately.
Tips
- Test mobile first — it's usually slower and Google indexes mobile-first.
- Aim for LCP under 2.5s, INP under 200ms and CLS under 0.1.
- Compress and lazy-load images — they're the most common culprit.
- Set width and height on images to avoid layout shift.
- Defer or remove render-blocking scripts and unused CSS.
- Use a CDN and enable compression (gzip or Brotli).
- Re-test after each change to confirm the gain.
- Prefer real-user field data over lab data when it's available.
Common mistakes to avoid
Only testing on desktop
Fix: Test mobile too — most users and Google's index are mobile-first.
Chasing a perfect 100
Fix: Focus on Core Web Vitals thresholds and real-user data, not a flawless lab score.
Ignoring layout shift
Fix: Set image/embed dimensions and reserve space to keep CLS low.
Unoptimized images
Fix: Compress, resize and lazy-load images, and use modern formats.
How it works
- 1
Enter a URL
The page you want to test.
- 2
Pick a device
Run the test for mobile or desktop.
- 3
Improve
See scores, Core Web Vitals and top fixes.
Frequently asked questions
Google Lighthouse scores for performance, accessibility, best practices and SEO, plus Core Web Vitals (LCP, INP, CLS) and lab metrics, for mobile or desktop.
Field data comes from real Chrome users and only appears for sites with enough traffic. Smaller sites still get full lab metrics.
Lighthouse scores for performance, accessibility, best practices and SEO, plus Core Web Vitals (LCP, INP, CLS) and lab metrics, for mobile or desktop.
Google's key experience metrics: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability).
Field data comes from real Chrome users and only shows for sites with enough traffic. Lower-traffic sites still get full lab metrics.
Lab data is a single controlled test; field data reflects what real users experienced over the last 28 days.
Lab tests vary with network and server conditions. Run it a few times and look at the trend.
No. The URL is sent to Google's PageSpeed Insights only to run the test.
Conclusion
A page speed test turns a vague 'it feels slow' into concrete scores, Core Web Vitals and a prioritized fix list. Pair it with the image SEO checker and HTTP header checker to tackle the most common speed problems.