Core Web Vitals Checker
Check Core Web Vitals — LCP, INP and CLS, the metrics Google ranks by.
How to use Core Web Vitals Checker
- Enter the page URL and click “Check Vitals”.
- Read the three scores against the thresholds: LCP < 2.5 s, INP < 200 ms, CLS < 0.1.
- Fix the failing metric's playbook — LCP = images/server, INP = JavaScript, CLS = reserved space.
- Re-test after changes, then watch Search Console's Core Web Vitals report confirm with real-user data over the following weeks.
What is Core Web Vitals Checker?
A Core Web Vitals checker tests a page against the three user-experience metrics Google folds into rankings: LCP (Largest Contentful Paint — how fast the main content appears; good is under 2.5 s), INP (Interaction to Next Paint — how responsively the page reacts to taps and clicks; good is under 200 ms), and CLS (Cumulative Layout Shift — how much the layout jumps around while loading; good is under 0.1).
Each metric captures a distinct annoyance: staring at a blank area (LCP), tapping a button that ignores you (INP), and the text jumping just as you tap — hitting an ad instead (CLS). Google grades each Good / Needs improvement / Poor against those thresholds.
About the Core Web Vitals Checker
Enter a URL, click Check Vitals, and see the three metrics with their ratings against Google's thresholds — the same measures Search Console's Core Web Vitals report grades your whole site on.
Fixing each metric has a known playbook. LCP: compress and properly size the hero image, preload it, cut server response time, remove render-blocking scripts. INP: less JavaScript on the main thread — defer non-critical scripts, break up long tasks, audit third-party tags. CLS: give images and embeds explicit width/height, reserve space for ads and banners, avoid injecting content above what's already rendered, and preload fonts to prevent swap-shift.
Note the lab-vs-field distinction: checkers measure a test load (lab data), while Google ranks on real-user field data collected from Chrome users over 28 days. Lab catches the problems; Search Console's report confirms real users feel the fix — expect the month's lag.