A Core Web Vitals Checker Backed by Real Measurements
Core Web Vitals are one of Google's confirmed ranking signals, and they're measured, not opinions. This checker pulls real Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift data from Google's own PageSpeed Insights API — the same data Google itself uses.
A lot of "speed checkers" run a single test and give you a letter grade. This one measures your three actual Core Web Vitals using Google's PageSpeed Insights API, annotates a real screenshot of your page showing exactly which elements are causing layout shift or slow rendering, and explains the fix for each metric in plain language.
Because the underlying numbers come from Google's own measurement infrastructure, not an AI guess, the scores you see here are the same category of data Google factors into ranking — not a proxy metric invented by a third-party tool.
What this Core Web Vitals checker measures
- Core Web Vitals — LCP, INP, and CLS, measured directly via Google PageSpeed Insights
- Server response & TTFB — Time to First Byte and hosting performance
- JavaScript & CSS optimization — minification and render-blocking resources
- Image & media optimization — formats, compression, and lazy loading
- Caching & CDN strategy — browser caching policy and CDN coverage
- Mobile performance — mobile-specific speed and mobile Core Web Vitals
- Third-party script impact — analytics, ads, and chat-widget performance cost
A screenshot that shows you the actual problem
Alongside the scores, the report includes a real screenshot of your page with the specific elements causing issues marked directly on it — the exact image that's your Largest Contentful Paint element, or the exact block that shifts and causes your layout-shift score to drop. You're not left guessing which element the score is even referring to.
Why this matters beyond SEO
Core Web Vitals correlate directly with conversion rate — slow, jumpy pages lose visitors before they ever see your offer. Fixing the issues this checker finds usually improves both your search ranking and your actual conversion numbers.
Frequently asked questions
Yes — LCP, INP, and CLS are pulled directly from Google's PageSpeed Insights API, the same underlying measurement Search Console's Core Web Vitals report uses.
Different tools test from different server locations, connection speeds, and device profiles, which can shift results. This checker uses Google's own API specifically so the numbers match what Google factors into ranking.
Yes — mobile performance and mobile Core Web Vitals are scored as their own dedicated category, since Google evaluates mobile experience separately under mobile-first indexing.
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