Free Core Web Vitals Checker
Core Web Vitals are Google ranking signals that measure real user experience. Check your LCP, INP, and CLS scores to see if your site passes or fails.
Core Web Vitals Explained
LCP - Largest Contentful Paint
Good
Under 2.5 seconds
Needs Work
2.5 to 4 seconds
Poor
Over 4 seconds
What it measures
Measures how long it takes for the main content to load. Usually a hero image, heading, or video.
Why it matters
LCP directly affects how fast users see your page content. Slow LCP increases bounce rates.
How to fix it
Optimize your largest image. Use next-gen formats, preload key resources, reduce server response time.
INP - Interaction to Next Paint
Good
Under 200 milliseconds
Needs Work
200 to 500 milliseconds
Poor
Over 500 milliseconds
What it measures
Measures how quickly your page responds to user interactions like clicks and taps. Replaced FID in March 2024.
Why it matters
A slow INP makes your website feel sluggish. Users expect immediate feedback when they click or tap.
How to fix it
Reduce JavaScript execution time, break up long tasks, defer non-critical scripts.
CLS - Cumulative Layout Shift
Good
Under 0.1
Needs Work
0.1 to 0.25
Poor
Over 0.25
What it measures
Measures how much the visible page content unexpectedly shifts during loading.
Why it matters
High CLS is frustrating. Users click one thing and the layout shifts causing them to click something else.
How to fix it
Set explicit width and height on all images and videos. Reserve space for ads and embeds.