Core Web Vitals Checker for LCP, INP & CLS
Check whether a page passes Core Web Vitals for the selected device. Analyse 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
Metrics checked
Mobile + Desktop
Device modes
Field + Lab
Source labels
Core Web Vitals Checker
Check LCP, INP, and CLS for a single URL using field data when available.
Check settings
Data handling
Field data is preferred. Lab data is used only when field data is limited or unavailable.
Free public checks are limited to 3 uses/day. CAPTCHA may appear for protection.Remaining today: 3
Focused checks for Core Web Vitals quality.
This page keeps the public workflow focused on the signals that determine whether a page passes Core Web Vitals for the selected device.
Use it during internal linking audits, content optimisation, technical SEO reviews, website migrations and content hub planning.
Check the three CWV metrics
Focus on Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift instead of a broad PageSpeed score.
Label field, origin and lab sources
See whether the assessment uses page field data, origin field fallback, mixed sources, lab fallback or unavailable data.
Analyse Mobile or Desktop
Run a focused check for the selected device, with Mobile as the recommended default for public CWV checks.
Prioritise rule-based fixes
Identify whether loading, responsiveness or visual stability should be handled first with practical fix categories.
A fast-looking page can still fail real users.
Core Web Vitals help teams understand whether a page loads slowly, responds late to interactions or shifts unexpectedly during loading. Wranker keeps the data source visible so teams know how much confidence to place in the check.
Find the weakest metric first
Prioritise Poor metrics before Needs Improvement metrics so performance work starts where it matters most.
Avoid false pass signals
Field data is preferred for pass/fail judgement, while lab diagnostics are clearly framed as debugging support.
Support SEO QA handoff
Use concise metric labels, source context and fix priorities for technical SEO QA and developer conversations.
From page URL to focused CWV workflow.
The landing page stays focused on the pre-submit workflow. The detailed output opens after the check runs.
Enter a page URL
Add a live public URL. The public checker is not intended for localhost, private IPs or internal URLs.
Select Mobile or Desktop
Choose the device you want to test. Mobile is the recommended default; Desktop is useful for comparison.
Run the CWV check
Wranker prepares a field-first assessment and uses lab fallback only when real-user data is limited.
Review the dashboard output
After submission, review CWV status, metric quality, source labels and rule-based fix priorities.
Built for focused performance SEO decisions.
Use the checker when you need a quick, clear signal before deeper diagnostics, developer handoff or project-level tracking.
Technical SEO specialists
Check which Core Web Vitals metric needs attention before opening deeper PageSpeed or technical audit workflows.
Developers
Confirm whether performance fixes are aimed at loading, interaction responsiveness or layout stability.
SEO agencies
Add focused CWV checks to audit, QA, reporting and client handoff workflows without running a full audit first.
Marketing and launch teams
Review campaign pages, service pages and launch pages before promoting traffic to slower or unstable experiences.
Open the next tool in your workflow.
Use Core Web Vitals as the focused first step, then move into speed, size and technical SEO diagnostics where needed.
Page Speed Insight Checker
Review broader PSI and Lighthouse performance diagnostics after a CWV metric needs attention.
OpenPage Size Checker
Inspect page weight and asset size when loading performance or LCP needs improvement.
OpenTechnical SEO Audit Tool
Connect CWV issues with broader crawl, indexability and technical health checks.
OpenWebsite SEO Analyzer
Review SEO, content, technical and performance signals together for a wider page-quality view.
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 is a tool that checks whether a page passes the main Core Web Vitals metrics: LCP, INP and CLS.
The tool checks Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift.
A good LCP is 2.5 seconds or less. LCP above 2.5 seconds needs improvement, and above 4.0 seconds is poor.
A good INP is 200 milliseconds or less. INP above 200 milliseconds needs improvement, and above 500 milliseconds is poor.
A good CLS is 0.1 or less. CLS above 0.1 needs improvement, and above 0.25 is poor.
The tool should prefer field data where available. If page-level field data is unavailable, it may show origin-level field data or lab fallback with a clear label.
Lab data is useful for diagnostics, but it should not be treated as a full real-user Core Web Vitals pass. Field data is preferred for pass/fail assessment.
INP requires real-user interaction data. It may be unavailable when the page or origin does not have enough field data.
Mobile is the recommended default because mobile Core Web Vitals issues are often more visible. Desktop checks are useful for comparison.
Yes. Public exports may include CSV, PDF and JSON. You can also copy the summary, metrics and fix list where available.
Start with a focused Core Web Vitals check.
Use Wranker to check LCP, INP and CLS, compare Mobile and Desktop, prioritise fixes, export SEO reports and connect checks with deeper technical SEO workflows.