Core Web Vitals Checker for LCP, INP & CLS for LCP, INP & CLS
Check whether a page passes Core Web Vitals for the selected device. Analyze LCP, INP, and CLS for a single public URL using field data where available, with lab fallback shown clearly when real-user data is limited.
LCP • INP • CLS
Loading, responsiveness, and visual stability
Mobile + Desktop
Test performance separately by device
Field + Lab
Lab diagnostics clearly labeled
Run a Free Core Web Vitals Test
Run a Core Web Vitals test for any URL using field and lab performance data.
Test settings
How results are sourced
Page-level field data is shown when available. If there is not enough page data, WRanker may use origin-level field data or clearly labeled lab diagnostics.
You can run up to 3 free public tests per day. CAPTCHA verification may be required.Tests remaining today: 3
Focused Core Web Vitals Checks for Better Page Experience
Your Core Web Vitals analysis focuses on the three signals that reflect loading performance, interaction responsiveness, and visual stability. WRanker also shows the data source behind the assessment so you can interpret each result with the right level of confidence.
Check Core Web Vitals Metrics
Measure LCP, INP, and CLS to identify Core Web Vitals issues beyond basic PageSpeed scores.
Compare Field and Lab Data
Compare field and lab data to understand real-user performance and testing results.
Test Mobile and Desktop Performance
Measure Core Web Vitals for mobile or desktop to identify device-specific performance issues.
Prioritise Performance Fixes
Prioritise fixes for loading, responsiveness and visual stability based on Core Web Vitals results.
A fast page should feel fast to real users.
Core Web Vitals show whether a page loads quickly, responds without frustrating delays, and stays visually stable while people use it. A focused Core Web Vitals audit gives SEO and development teams a clearer starting point for improving the experience.
Identify the biggest performance issue
Prioritise LCP, INP or CLS issues first to improve Core Web Vitals more effectively.
Make better performance decisions
Compare field and lab data to understand real user performance before making optimisation decisions.
Speed up technical SEO fixes
Share clear performance insights and fix priorities with developers for faster Core Web Vitals optimisation.
From URL to Complete Core Web Vitals Analysis
Run a Core Web Vitals test in four simple steps to measure page performance and review actionable recommendations.
Enter a page URL
Enter a live public URL to check Core Web Vitals. Private or local URLs aren't supported.
Choose Mobile or Desktop
Choose mobile or desktop to measure Core Web Vitals for each device experience.
Run the Core Web Vitals Test
: Measure LCP, INP, and CLS using field data, with lab data used when needed.
Review Core Web Vitals Results
Review Core Web Vitals results, performance issues and recommended fixes for your page.
Built for teams improving website performance.
Use this Core Web Vitals Checker to identify performance issues before deeper audits, development fixes or ongoing monitoring.
Technical SEO specialists
Identify which Core Web Vitals metric needs attention and where deeper performance investigation should begin.
Web developers
Review LCP, INP, and CLS to focus debugging on loading, interaction responsiveness, or visual stability.
SEO agencies
Use the check as the first step in a Core Web Vitals audit for client QA, reporting, and developer handoffs.
Website owners and marketers
Review landing, service, and campaign pages before launches or promotions so performance issues can be addressed before traffic increases.
Continue Your Page Speed and Core Web Vitals Review
After checking LCP, INP, and CLS, choose the next tool based on what you need to investigate: broader Lighthouse diagnostics, heavy page assets, technical health, or complete on-page SEO.
Page Speed Insight Checker
Review broader PSI and Lighthouse performance diagnostics after a CWV metric needs attention.
OpenPage Size Checker
Measure page weight, request count, asset breakdown, and compression to find heavy resources that may be slowing the page.
OpenPage Technical Health Checker
Check status codes, TTFB, response size, render-blocking resources, and mixed content when a page needs a broader technical review.
OpenWebsite SEO Analyzer
Review metadata, headings, content, links, images, indexability, and schema when you need a complete single-page SEO check.
FAQs about the Core Web . Vitals Checker
Clear answers about thresholds, data sources, devices and exports before you run the tool.
A Core Web Vitals checker measures LCP, INP, and CLS. These metrics show how quickly the main content loads, how responsive the page feels during interactions, and how stable the layout remains for real users.
Enter a publicly accessible URL, choose mobile or desktop, and start the test. WRanker checks available Core Web Vitals data and clearly labels the source. The public tool currently allows up to three free tests per day.
Good scores are LCP at 2.5 seconds or less, INP at 200 milliseconds or less, and CLS at 0.1 or less. Values above these thresholds are classified as Needs Improvement or Poor.
A page passes when the 75th-percentile field result meets the Good threshold for each assessed Core Web Vital on the selected device. CrUX field data is aggregated across a rolling 28-day period, so it reflects recent real-user experience rather than one instant.
Field data comes from real Chrome users across different devices and network conditions. Lab data comes from a controlled test and helps diagnose potential problems. Lab results are useful for debugging, but they do not replace a complete real-user assessment.
Field data may be unavailable when Chrome’s dataset does not have enough eligible visits for that specific URL. The checker may show origin-level data for the wider site or clearly labeled lab diagnostics when page-level data is missing.
Test both because mobile and desktop results are reported separately and can differ. Start with the device that represents your most important audience, then run the other mode to compare performance and avoid overlooking device-specific issues.
Yes. Google uses Core Web Vitals within its ranking systems, but they are only one part of page experience and broader ranking evaluation. Passing does not guarantee higher positions, so relevance, usefulness, and overall site quality still matter.
Start with any metric marked Poor, then address Needs Improvement results. Improve LCP by reducing loading delays, INP by shortening long JavaScript tasks, and CLS by reserving space for images, ads, and dynamic content. Retest after meaningful changes.
Run a Core Web Vitals audit before important launches, after redesigns, template or script changes, and whenever performance concerns appear. Because field data uses a rolling 28-day window, confirm immediate fixes with lab diagnostics and track real-user results over time.
Start Improving Your Core Web Vitals Today .
Measure Core Web Vitals, analyze LCP, INP, and CLS, compare mobile and desktop performance, prioritize fixes, and improve your website's page experience with actionable SEO insights.