Core Web Vitals test: see if your page passes LCP, INP and CLS

Enter a page above: the test reads LCP, INP and CLS from the Chrome UX Report, what real Chrome visitors experienced over 28 days, and runs a Lighthouse lab test beside it. For the whole site, open the Core Web Vitals report in Search Console, which groups similar URLs. The Performance panel in Chrome's developer tools shows live values for your own visit.

Good means LCP within 2.5 s, INP within 200 ms and CLS at or below 0.1, measured at the 75th percentile of page visits. Poor starts above 4 s for LCP, 500 ms for INP and 0.25 for CLS; anything between needs improvement. The test colours each metric by these thresholds, for real users and for the lab run.

Interaction to Next Paint replaced First Input Delay as a Core Web Vital in March 2024. FID only timed the delay before the first interaction was handled; INP looks at the interactions throughout a visit and reports one of the slowest, so it catches pages that react slowly after loading. This test reports INP from real users. Total Blocking Time is its lab stand-in.

The one rated poor for real users, and among those usually LCP, because it affects most pages and has the clearest fixes: a faster server, a lighter hero image and fewer render-blocking files. Fix INP next if the page runs heavy scripts, and CLS if content jumps while loading. The test links each metric to the guide that explains how to move it.

It means three out of four page visits were at least that fast. Google judges each metric at the 75th percentile of real Chrome visits over 28 days, so a page passes LCP when 75 % of visits show the main content within 2.5 s. A few slow visits on bad connections do not fail you, but a quarter of visitors having a poor experience does.

Because INP measures how quickly the page responds to real clicks, taps and key presses, and a lab test loads the page without touching it. Lighthouse shows Total Blocking Time instead, which roughly tracks INP: long JavaScript tasks make both worse. Real INP appears when the Chrome UX Report has enough visits to your page or site.

Google only publishes Core Web Vitals for pages and sites with enough Chrome visitors to be statistically meaningful. Smaller sites get origin-level data, all pages combined, or none at all. The lab run still shows what to fix, and Total Blocking Time points at the same JavaScript problems that make INP slow.

Yes, with no sign-up. getReport is funded by donations, not plans, and the complete report with all seven modules is one click away, also free. It stays at its shareable link for 12 months, is not listed publicly and carries a noindex tag, and nothing about your visitors is collected.