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Free PageSpeed Checker

Check a page's Lighthouse performance, SEO, accessibility and best-practices scores, its lab Core Web Vitals, and the top opportunities to speed it up. Free, live, no account.

verifiedEvidence shown with sourcelock_openNo account requiredblockNo invented metrics

speed

Run a real check above

Submit a public URL, domain, or keyword. Novaverb will show only the evidence this tool can actually retrieve or measure.

Evidence model

Know what the result proves

Each free check separates measured evidence from interpretation, and interpretation from the deeper work available in a connected workspace.

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1. Source

A live Lighthouse lab audit. The result identifies where its evidence came from.

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2. Boundary

Scores come from a single Lighthouse lab audit in a simulated environment. Lab results are a diagnostic and can differ from real-user field data.

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3. Next action

Use the finding to verify a problem, then connect a workspace when you need history, monitoring, or site-wide analysis.

PageSpeed explained

Lighthouse scores are a diagnostic, not the ranking itself

A Lighthouse audit runs the page in a controlled lab and grades four categories from 0 to 100. It's the fastest way to find what's slowing a page down and get concrete opportunities — but Google ranks on real-user field data, so treat the lab score as a to-do list, not the verdict.

The four categories

Performance — loading speed and responsiveness from lab metrics like LCP, TBT and CLS.
Accessibility — automated checks for contrast, labels, and assistive-tech support.
Best Practices — security, correct image sizing, and modern web standards.
SEO — crawlable, mobile-friendly, correctly tagged pages.

Lab vs field

Lab data is reproducible and great for debugging. Field data (Core Web Vitals) reflects real users on real devices and networks. Use both: fix in the lab, confirm in the field.

Get the right answer

What to submit — and what to avoid

The check is only as honest as its input. These examples keep you out of the two mistakes that produce a misleading result.

check_circleUse it like this

yourdomain.comAny address form works — Lighthouse loads it in a controlled lab. http or https, with or without www, a bare domain or a full path — we normalize it for you.

https://www.yourdomain.com/pageA specific public page is fine; we audit exactly what you submit.

cancelAvoid this

A page behind a login or paywallThe lab run cannot reach authenticated content, so the audit would not represent it.

Public methodology

Exactly how this result is produced

No opaque score. Every result comes from these steps — so you can trust it, reproduce it, and explain it to a client.

We normalize the address and run the URL through Google's Lighthouse audit via PageSpeed Insights.
We report the category scores and lab Core Web Vitals from that run.
We surface the top opportunities Lighthouse identifies, using its published scoring methodology.

Built on public standards

The international standards this check applies

Novaverb measures your site against these published specifications — not an opaque score. Each card names the standard, the body that maintains it, and exactly how this tool applies it.

GoogleLighthouse

Lighthouse audit engine

Runs the open-source Lighthouse audit and reports its category scores.

Read the specification open_in_new

GooglePageSpeed

PageSpeed Insights methodology

Uses the PageSpeed scoring methodology and lab Core Web Vitals.

Read the specification open_in_new

verifiedWe list a standard only where this tool genuinely reads or measures against it. Where a signal is outside a live check, the result says so instead of implying coverage.

Common questions

PageSpeed Checker FAQ

What does the PageSpeed Checker report?

It runs a single Lighthouse lab audit in a simulated environment, reporting performance, SEO, accessibility and best-practices scores, lab Core Web Vitals, and the top opportunities to speed up the page.

What is a good Lighthouse performance score?

Lighthouse scores run from 0 to 100. Broadly, 90 and above is good, 50 to 89 needs improvement, and below 50 is poor. Treat it as lab guidance, not a real-user guarantee.

Why do lab results differ from real-user field data?

Lighthouse runs one audit under simulated network and device conditions, so it may not match real visitors' varied hardware and connections. Lab data is reproducible and diagnostic; field data reflects actual user experience over time.

How do I fix the opportunities PageSpeed reports?

Work through the listed opportunities, commonly compressing and sizing images, deferring unused scripts, eliminating render-blocking resources, and enabling caching. Each opportunity estimates potential savings, so prioritise the ones with the largest estimated time reduction.

What is the difference between the PageSpeed and Core Web Vitals checkers?

PageSpeed runs a Lighthouse lab audit with simulated conditions and diagnostic opportunities. The Core Web Vitals Checker reports real-user field data at the 75th percentile. Use lab to diagnose, field to judge actual experience.

What are the lab Core Web Vitals in this audit?

They are LCP, INP-related and CLS measurements taken during the single simulated Lighthouse run. Because they come from one lab test, they can differ from the real-user 75th-percentile field values Google actually assesses.

Why does my score change between runs?

Lighthouse simulates a run each time, so variability in network modelling, server response and page scripts shifts scores. Run several audits and look at the trend rather than treating one number as absolute.

Does the accessibility score mean my site is fully accessible?

No. Lighthouse checks automatable accessibility issues only and cannot verify everything, like meaningful alt text or keyboard flows. A high score is a helpful baseline, not proof of full accessibility compliance.

Why does PageSpeed matter for SEO?

Faster, well-built pages improve user experience and support Google's page experience signals. The audit surfaces concrete speed and best-practice fixes, helping reduce abandonment and remove technical barriers that can hold back rankings.

Can one PageSpeed audit tell me how all my users experience the page?

No. It is one lab audit in a simulated environment representing a single test condition. To understand real visitors across devices and networks, pair it with real-user field data from the Core Web Vitals Checker.

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