Free tools · Performance
Core Web Vitals checker
Enter your speed metrics and get a pass or fail verdict, where each one sits, and a fix list ordered by priority.
How to use it
Three steps.
Good to know. This tool reads numbers you give it. It does not run a Lighthouse test itself, because a published page cannot load other websites. Lab results can differ from real-user field data.
Step 1
Run PageSpeed Insights or Lighthouse for your page.
Step 2
Enter LCP, INP and CLS, plus any optional metrics.
Step 3
Read the verdict and work through the fixes, worst first.
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Want this done properly across your whole site?
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