Core Web Vitals Check
Measure loading speed, responsiveness, and visual stability in bulk.
Enter any single URL — get instant LCP, TBT, and CLS results.
Instant result
Mobile & Desktop
Real Google data
Want to check your entire website?
Use Bulk / Crawl mode — test up to 500 pages at once
Our crawler maps every subpage via sitemap + homepage links. Up to 500 pages.
Auto sitemap detection
Up to 500 pages
CSV export
Paste up to 500 URLs — one per line with full http:// or https://
MOBILE
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| Status | URL | LCP | TBT | CLS | Details |
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Bulk Core Web Vitals Check: Check up to 500 Pages
In 2020, Google introduced three new metrics — the Core Web Vitals — which are used to measure the user experience (UX) of a webpage. With our tool, you can check a single URL instantly or scan an entire domain and test up to 500 pages at once. Identify slow subpages on your site or compare performance with your competitors.
How to Use
Our Core Web Vital Test offers 3 different modes:
Single URL
Enter any single URL to get instant Core Web Vitals — LCP, TBT, and CLS. Perfect for checking one specific page quickly.
Bulk / Crawl Website
Set the start URL and our platform will parse the webpage, extract sitemaps, and find all active subpages to test. Crawling is limited to 500 URLs.
URL List
Input a direct list of explicit page paths to run bulk benchmarks across completely separate landing pages or competitor URLs.
You can also choose whether Core Web Vitals should be tested from the point of view of a mobile device or a desktop computer.
Core Web Vitals
The metrics correspond exactly to the metrics of Google PageSpeed Insights or the Lighthouse Performance Tool. In the following we introduce the different metrics to you.
1 Largest Contentful Paint (LCP)
The Largest Contentful Paint indicates the time when the browser rendered the largest visible element. This is the point in time at which the main content of the page was most likely loaded.
Good — LCP less than 2.5 seconds
Needs improvement — 2.5 to 4 seconds
Poor — LCP greater than 4 seconds
2 Total Blocking Time (TBT)
Total Blocking Time measures the total amount of time the main thread was blocked long enough to prevent input responsiveness, between First Contentful Paint and Time to Interactive.
Good — TBT less than 150 ms
Needs improvement — 150 to 600 ms
Poor — TBT greater than 600 ms
3 Cumulative Layout Shift (CLS)
Cumulative Layout Shift measures the sum of all layout shifts that occur during the lifetime of the page. A layout shift occurs whenever a visible element changes position from one frame to the next.
Good — CLS less than 0.1
Needs improvement — 0.1 to 0.25
Poor — CLS larger than 0.25
Frequently Asked Questions
Unlike almost all other tools, our tool tests up to 500 subpages at once. So you can analyze your whole website and identify slow subpages or compare your site with competitors — all for free.
Yes! Google uses Core Web Vitals as a ranking factor since 2021 as part of its Page Experience signals. Improving your Core Web Vitals can positively impact your search rankings.
Our tool uses the official Google PageSpeed Insights API — the same data source used by Google Search Console and pagespeed.web.dev. The results are 100% real and accurate.
Mobile testing simulates a mid-tier Android device on a slow 4G connection. Desktop uses a faster connection and higher performance device. Since most Google traffic is mobile, we recommend checking Mobile results first.
To improve LCP: optimize images, use a CDN, remove render-blocking resources. To improve TBT: reduce JavaScript execution time, remove unused JS. To improve CLS: always include size attributes on images and videos, avoid inserting content above existing content.
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