Core Web Vitals Checker
FreeReal LCP, INP & CLS from Chrome UX field data + full Lighthouse lab audit
Powered by Google PageSpeed Insights (Lighthouse + real-user Chrome UX data). Analysis takes ~10–30s.
About Core Web Vitals Checker
Core Web Vitals are now a real ranking and UX signal, and each metric points to a different problem — slow loading, sluggish interaction, or jumpy layout. Core Web Vitals Checker reports a page's LCP, FID, and CLS so you can see which specific vital is failing rather than treating performance as one vague blob.
Enter a URL and the tool evaluates the page and returns the three vitals with their values in your browser. It is free, needs no signup, and runs instantly. Use it to pinpoint whether to chase a heavy hero image, a blocking script, or a shifting layout, and to confirm your fixes actually move the metric you targeted.
Common uses
- Identify whether a page's problem is loading (LCP), interactivity (FID), or layout shift (CLS)
- Verify that an optimization moved the specific vital you were targeting
- Check a page against the thresholds search engines use for a good experience
- Diagnose layout shift complaints by isolating the CLS score
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Real-time results
- DNS, IP, speed checks
- No setup required
FAQ
What do LCP, FID, and CLS mean?
LCP measures how fast the main content loads, FID measures input responsiveness, and CLS measures visual stability from unexpected layout shifts.
Are these lab or field measurements?
The tool evaluates the page on demand, which is a lab-style measurement. Field data from real users can differ, so use both perspectives where possible.
Why is CLS high even though the page looks stable to me?
Layout shifts often happen during load, before the page settles, especially with images or ads lacking reserved space. The metric captures those early jumps.
Can I use Core Web Vitals Checker on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.