Free tool

Core web vitals tester

Test Core Web Vitals across mobile and desktop.

Free23 Oct 2026

Type

SEO

free tool

Privacy

Zero

no tracking, no storage

Instant

Results

fetched for you

Built by

WebGrow24

senior team

TL;DR

Test Core Web Vitals across mobile and desktop. The output shows the five readings, each rated good, needs work or poor, plus a pass or fail verdict. On a mobile run, it also shows whether the page is mobile-friendly. Free to use, no signup. We fetch the URL you give it on our server, because a browser cannot read a page it is not displaying. We log a count of runs per day, never the URL you submit.

Key takeaways

Free seo tool. No signup, no tracking, nothing stored.
Instant results. We fetch the URL you give it on our server, because a browser cannot read a page it is not displaying. We log a count of runs per day, never the URL you submit.
Enter a URL.
The output shows the five readings, each rated good, needs work or poor, plus a pass or fail verdict. On a mobile run, it also shows whether the page is mobile-friendly.

Test any public URL for Core Web Vitals on mobile and desktop. Get LCP, INP, CLS, FCP and TTFB readings, each rated good, needs work or poor. LCP is loading speed, INP is interactivity, CLS is visual stability, FCP is first contentful paint and TTFB is server response time.

Test Core Web Vitals

Run a full Core Web Vitals audit on any public URL. Get LCP, INP, CLS, FCP and TTFB for mobile and desktop.

10 tests per minute per IP. No storage, no logging of URLs.

How to use

1Enter a URL.
2Pick mobile or desktop.
3Read the five readings and their ratings.

How we compute

The output shows the five readings, each rated good, needs work or poor, plus a pass or fail verdict. On a mobile run, it also shows whether the page is mobile-friendly.

Questions

Frequently asked questions

Test Core Web Vitals across mobile and desktop.

What do the abbreviations mean?

LCP measures how fast the main content loads. INP measures how fast the page responds to clicks. CLS measures whether the page jumps while loading. FCP measures when the first text or image appears. TTFB measures how fast the server responds to a request.

Are these real-user readings?

No. They are lab estimates from a simulated test, so the same page gives the same numbers on every run. Real-user data comes from Chrome users who visited your page. Run your URL through Google PageSpeed Insights for that.

Does this replace a page speed test?

No. It covers the five Core Web Vitals on mobile and desktop. A full page speed test also runs deeper checks, such as unused JavaScript and oversized images. Use both when you want the whole picture.

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