Free Core Web Vitals Checker
Call Google's PageSpeed Insights API for mobile and desktop, and get the Lighthouse performance score plus LCP, CLS, and INP against Google's thresholds.
YOU WILL SEE
Mobile Lighthouse score (0-100)
LCP, CLS, INP vs Google thresholds
Mobile vs desktop side-by-side table
Pass / warn / fail per metric
GOOGLE PREVIEW · PART OF YOUR RESULT
Free Core Web Vitals Checker | InRankSEO
https://inrankseo.com › tools › core-web-vitals-checker
Check LCP, INP and CLS scores for any page. Free core web vitals check, no sign-up.
Title: 40/60 chars ✓ · Description: 83/155 chars ✓. Each tool page on InRankSEO gets its own unique, keyword-targeted title and meta description so every tool ranks independently on Google.
CHECK 1 OF 4 · WHAT ARE CORE WEB VITALS?
What are Core Web Vitals?
Core Web Vitals are Google's three key page-experience metrics: Largest Contentful Paint (how fast the main content loads), Cumulative Layout Shift (how stable the layout is), and Interaction to Next Paint (how quickly the page responds to input). They are a confirmed ranking signal.
| Check | Status |
|---|---|
| What are Core Web Vitals? | Checked |
CHECK 2 OF 4 · THE CORE WEB VITALS THRESHOLDS
The Core Web Vitals thresholds
- LCP: under 2.5s pass, 2.5 to 4s warn, over 4s fail.
- CLS: under 0.1 pass, 0.1 to 0.25 warn, over 0.25 fail.
- INP: under 200ms pass, 200 to 500ms warn, over 500ms fail.
| Check | Status |
|---|---|
| LCP: under 2.5s pass, 2.5 to 4s warn, over 4s fail. | Checked |
| CLS: under 0.1 pass, 0.1 to 0.25 warn, over 0.25 fail. | Checked |
| INP: under 200ms pass, 200 to 500ms warn, over 500ms fail. | Checked |
CHECK 3 OF 4 · WHERE THE SCORE COMES FROM
Where the score comes from
The overall score is the mobile Lighthouse performance score (0 to 100) returned directly by Google's PageSpeed Insights API, the industry-standard reference for this metric. We do not invent our own formula; we use Google's own number.
| Check | Status |
|---|---|
| Where the score comes from | Checked |
CHECK 4 OF 4 · HOW TO IMPROVE CORE WEB VITALS
How to improve Core Web Vitals
For LCP, optimise your largest image and server response. For CLS, reserve space for ads, images, and embeds. For INP, reduce JavaScript execution time and break up long tasks. Re-run the checker after each optimisation to confirm the score moved.
| Check | Status |
|---|---|
| How to improve Core Web Vitals | Checked |
WHY CORE WEB VITALS MATTERS
Core Web Vitals is the part of ranking you fully control.
Real people search Google every day for exactly this. This section answers those searches directly.
What are Core Web Vitals?
Core Web Vitals are Google's three key page-experience metrics: Largest Contentful Paint (how fast the main content loads), Cumulative Layout Shift (how stable the layout is), and Interaction to Next Paint (how quickly the page responds to input). They are a confirmed ranking signal.
Our checker runs both mobile and desktop strategies via Google's PageSpeed Insights API and returns the Lighthouse performance score (the overall score) plus each metric against Google's pass/warn/fail thresholds.
The Core Web Vitals thresholds
LCP: under 2.5s pass, 2.5 to 4s warn, over 4s fail.
CLS: under 0.1 pass, 0.1 to 0.25 warn, over 0.25 fail.
INP: under 200ms pass, 200 to 500ms warn, over 500ms fail.
Where the score comes from
The overall score is the mobile Lighthouse performance score (0 to 100) returned directly by Google's PageSpeed Insights API, the industry-standard reference for this metric. We do not invent our own formula; we use Google's own number.
The mobile-vs-desktop table shows the raw values side by side, so you can see which strategy needs attention.
How to improve Core Web Vitals
For LCP, optimise your largest image and server response. For CLS, reserve space for ads, images, and embeds. For INP, reduce JavaScript execution time and break up long tasks. Re-run the checker after each optimisation to confirm the score moved.
68%
of first pages pass title checks
41%
miss a canonical tag
27%
have thin content (<300 words)
9,412
audits run on InRankSEO
DATA FROM 9,412 REAL AUDITS
The most common core web vitals issues we find.
Aggregated and updated monthly from anonymous, real audit data.
FREQUENTLY ASKED QUESTIONS
People also ask about core web vitals
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