Page Speed Test
Last updated: June 20, 2026Core Web Vitals & Lighthouse score for any URL.
Page Speed Test is a free online tool to core Web Vitals & Lighthouse score for any URL. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Page Speed Test
This page speed test measures how fast any URL loads on mobile or desktop using Google PageSpeed Insights. It returns the Lighthouse performance score, lab metrics (LCP, FCP, Total Blocking Time, CLS, Speed Index), real-user Core Web Vitals field data when available, and a prioritized list of the biggest speed opportunities. Free, no sign-up.
- 1Enter a URL and choose mobile or desktop.
- 2Wait for the full Lighthouse analysis (usually 10–30 seconds).
- 3Improve the metrics that fail and work through the opportunities.
Free to use
No watermarks and no forced sign-up. Free credits to get started.
Private by design
Runs in your browser — your files never leave your device.
Fast & simple
A clean interface, instant results, and it works on any device.
Check Core Web Vitals before they hurt rankings
Core Web Vitals are a confirmed ranking signal. Test your key pages to see LCP, INP and CLS against Google's pass thresholds, using real-user field data where available, so you can fix a failing metric before it drags down both rankings and conversions.
Compare mobile and desktop performance
Most sites are slower on mobile, and Google indexes mobile-first. Run both strategies to see where the gap is and prioritise the mobile experience, which is what most of your visitors and the crawler actually see.
Get a prioritized list of fixes
Instead of guessing, the test lists the specific opportunities with the largest estimated savings — render-blocking resources, unoptimised images, unused code — so you spend effort on the changes that will move the score the most.
Page Speed Test — frequently asked questions
What are Core Web Vitals?
They are three user-experience metrics Google uses as a ranking signal: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability). The test reports all three.
What is the difference between lab and field data?
Lab data is a single controlled Lighthouse run, useful for debugging. Field data comes from real Chrome users over the past 28 days and is what reflects actual experience. The test shows field data when Google has enough of it for the URL.
Why do scores change between runs?
Lab scores vary with network conditions, server load and the elements on the page during each run. Field data is more stable. Focus on the trend and the opportunities rather than a single exact number.
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