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Page speed, audited by Lighthouse.

Run a free PageSpeed test on any URL: Performance, Accessibility, Best Practices, SEO and Core Web Vitals. Powered by Google Lighthouse.

Free, no account Mobile & desktop Real Google data

Verification

Audit in ~40 seconds. Results stay for 7 days. Retest after 5 minutes.

Try an example:

What you'll see

The full Lighthouse report — scores, vitals, fix-list.

Every audit returns four scores, the three Core Web Vitals, and a ranked list of opportunities with the time you'd save if you fixed each one.

Audit your page
example.com Mobile Sample report
76
Performance Needs work
94
Accessibility Good
92
Best practices Good
100
SEO Good
Core Web Vitals — field data where available
LCP Good
2.1 s

Largest Contentful Paint

INP Good
180 ms

Interaction to Next Paint

CLS Good
0.05

Cumulative Layout Shift

Top opportunities — ranked by potential savings
Eliminate render-blocking resources
Inline critical CSS and defer non-critical JS so the first paint isn't blocked.
−1.2 s
Properly size images
Serve images at the size they display at; today many are 2–4× too large.
−0.8 s
Reduce unused JavaScript
Code-split and tree-shake — 184 KB of the main bundle is unused on this route.
−0.4 s

Real reports show every opportunity Lighthouse finds, with the exact resources and bytes involved.

Core Web Vitals

The three metrics Google ranks user experience by.

Core Web Vitals are part of Google's page-experience signals. Every PageSpeed test grades your page against the same thresholds Google uses.

LCP

Largest Contentful Paint

How quickly the largest visible element (hero image, headline) renders. The user's "is this page loading?" moment.

Good
≤ 2.5 s
Needs work
≤ 4.0 s
Poor
> 4.0 s

INP

Interaction to Next Paint

How quickly the page responds when a user taps, clicks or types. Replaces the older First Input Delay (FID).

Good
≤ 200 ms
Needs work
≤ 500 ms
Poor
> 500 ms

CLS

Cumulative Layout Shift

How much the page jumps around as it loads — image without dimensions, late-mounting banners, web fonts.

Good
≤ 0.10
Needs work
≤ 0.25
Poor
> 0.25

Thresholds source: web.dev/vitals. Our report also surfaces secondary lab metrics (FCP, TBT, Speed Index, TTFB) for context.

What we measure

Four Lighthouse categories, on every audit.

Performance

LCP, INP, CLS plus the lab metrics (FCP, TBT, Speed Index, TTFB) that explain why a page is slow.

Accessibility

Contrast, labels, focus order, ARIA usage and the keyboard-navigation issues that block real users.

Best practices

HTTPS, console errors, deprecated APIs, vulnerable libraries and modern-platform compatibility.

SEO

Crawlability, meta tags, mobile-friendliness, structured data and the on-page basics search engines check.

How it works

Real Google Lighthouse data, in under a minute.

  1. 01

    Paste a URL

    Any public page. Bare domains work too — we normalise to https. Pick mobile or desktop.

  2. 02

    Google runs Lighthouse

    We call the PageSpeed Insights API on Google's servers — same engine PSI uses. ~20–40 seconds.

  3. 03

    Get the full report

    Scores, Core Web Vitals, every opportunity with potential savings — saved for 7 days.

Run a Lighthouse audit on your page.

Free, no sign-up. Mobile or desktop. Results in ~40 seconds.

Start the audit