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Core Web Vitals Checker

The Core Web Vitals Checker runs your page through LCP, INP, and CLS measurement, identifies specific render-blocking issues, and returns prioritized fixes ranked by impact on real user experience.

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Updated 2026
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Core Web Vitals Checker
Score LCP, INP, CLS against Google's 2026 thresholds
LCP (Largest Contentful Paint)
s
Needs work
Target: ≤ 2.5s
INP (Interaction to Next Paint)
ms
Good
Target: ≤ 200ms
CLS (Cumulative Layout Shift)
Good
Target: ≤ 0.1
Needs improvement
Priority fixes
LCP: Optimize hero image (WebP, lazy sizing), preload critical fonts, reduce server TTFB, eliminate render-blocking resources

Want us to fix these?

Our Web & Shopify service fixes Core Web Vitals as part of every speed engagement.

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How to use

Get value from the Core Web Vitals Checker in 3 steps.

01

Enter your numbers

Input current metrics — no signup, no data saved to servers. Everything runs in your browser.

02

Get instant analysis

Results update live as you change inputs. See verdicts, benchmarks, and context, not just raw numbers.

03

Act on the output

Follow the "What this means" recommendations. Share with your team or bring to your next strategy review.

Use cases

When to use the Core Web Vitals Checker.

1

Audit site speed for SEO ranking risk

2

Prioritize render-blocking CSS and JavaScript

3

Diagnose layout shift causes

4

Monitor vitals after major site changes

About the Core Web Vitals Checker

Core Web Vitals are a direct ranking signal and a strong conversion-rate signal. Sites with poor vitals lose 15-30% of traffic to abandonment and rank below faster competitors for equivalent content. Our checker uses Chrome UX Report data where available, falls back to synthetic measurement, and breaks down each metric into the specific page elements causing issues. Fixes are ordered by expected impact on the metric score.

WANT IT DONE FOR YOU?

The Core Web Vitals Checker is free.
The full analysis is not.

Our SEO & Content service takes this to the next level — full audit, strategic roadmap, and senior operators executing the work. Starts at $6k/month, quarterly contracts.

FAQ

Core Web Vitals Checker
questions.

Got more? Ask us →

Yes — 100% free, no signup, no email wall. We built it because our operators needed it and decided to share.

No. All calculations run entirely in your browser. Nothing is sent to or stored on any server.

Reach out — we will share an embed snippet for teams that want to use this inside their own workflows.

Yes. No signup required, no data collected, nothing sent to our servers. Everything runs in your browser. We publish free tools because they build trust with operators who might eventually hire us — that's the entire business model.

The math is correct and the formulas are standard. The output is only as good as the inputs you provide — garbage in, garbage out applies here like anywhere. We recommend calibrating with at least 3 months of real data before making major decisions based on the results.

The tool lives at a stable URL that you can share with your team. We don't currently offer embeds, but the output is shareable via the copy button on calculator results. For white-label or embedded versions, contact us directly.

Three reasons. First, they help operators make better decisions even if they never hire us. Second, they let us show our thinking publicly — the frameworks behind these tools come straight from our client engagements. Third, they attract the kind of operators who later become great clients.

The free tools cover standard scenarios. For custom analysis — multi-channel attribution, cohort LTV modeling, MMM — we do this as part of paid engagements. Our CRO & Analytics service starts at $6k/month and includes custom dashboarding plus BigQuery setup if needed.

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