Free LCP test
Check your Largest Contentful Paint
Enter a page address, choose a connection, CPU and device, and see how long your main content takes to appear in a real Chrome browser.
2 min read3 sectionsUpdated
What LCP measures
Largest Contentful Paint is the time from when a visitor starts loading a page until the largest image or block of text in the first screen is painted. It is one of Google’s three Core Web Vitals, and it is the one visitors feel most: it is when the page looks ready.
- Good: 2.5 seconds or less
- Needs improvement: between 2.5 and 4 seconds
- Poor: more than 4 seconds
What the check shows you
Every check is one fresh, cold page load in Chrome with the network and CPU slowed down the way you chose, so you see the page the way a visitor on a weaker phone does.
A real browser load
Your page is loaded in headless Chrome with an empty cache, no cookies and DevTools network and CPU throttling.
The LCP element
See which image or heading was the largest paint, outlined on a screenshot of the first screen.
Where the time went
LCP split into server response, load delay, load time and render delay, so you know which part to fix.
Fixes in priority order
Plain-language next steps based only on what was measured in your run.
Why is my result different from other tools?
Lab tools use different network and CPU settings, test locations and browser versions, and every load varies a little. Compare runs made with the same settings, and use real-user data to see what visitors actually experience.
Why test on a slow connection and a slower CPU?
Many visitors use mid-range phones on mobile networks. A page that is fast on office Wi-Fi can take several seconds on Slow 4G with a 4x slower CPU, and that is where LCP problems show up.
Is my page or result stored?
The result is kept in memory for about 20 minutes so your browser can fetch it, then discarded. Nothing is saved to a database.
Can I test pages behind a login?
No. The check loads the public page in an empty browser without cookies, the same as a first-time visitor.
Is the page also quick to respond?
LCP tells you when the page looks ready. INP tells you whether taps and clicks feel instant once it is.