- 1Choose file
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Lighthouse SEO & Performance Audit online, free
Run a server-side Google Lighthouse audit on any public URL and score performance, accessibility, best practices, and SEO with actionable diagnostics.
- Encrypted server job — auto-deleted in 24 h
- Free, no sign-up, no watermark
How to use Lighthouse SEO & Performance Audit · Lighthouse SEO & Performance Audit — frequently asked questions
How to use Lighthouse SEO & Performance Audit
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Fine-tune the settings
Set device viewport and audit categories in the Fine-tune panel, or keep the defaults — they suit most files.
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Run Lighthouse SEO & Performance Audit
Press the start button. The file is processed on an encrypted, auto-deleting server job.
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Download the result
Save the finished file, or continue with another tool without downloading in between.
What Lighthouse SEO & Performance Audit can do
- Device Viewport: mobile and desktop
- Audit Categories — Lighthouse category groups to run
- Encrypted server processing; files are deleted automatically within 24 hours
- Free with no sign-up, no watermark and no daily limit
Common tasks
Lighthouse SEO & Performance Audit — frequently asked questions
What is Google Lighthouse?
Lighthouse is Google's open-source auditing engine that loads a page in a controlled headless browser and scores it across performance, accessibility, best practices, and SEO, returning concrete opportunities and diagnostics for each category.
How is this different from an on-device check?
A full Lighthouse run needs a real headless Chrome instance, so this audit executes on our servers against the public URL you provide, then returns the structured JSON report. No browser extension or install is required on your side.
What do the scores mean?
Each category is scored from 0 to 100. A score of 90 or above is considered good (green), 50 to 89 needs improvement (orange), and below 50 is poor (red). Scores are weighted aggregates of the individual audits.
Which device profile should I test?
Mobile is the default because Google indexes mobile-first and throttles the simulated network and CPU to reflect typical handsets. Switch to desktop when you specifically want to measure the desktop experience.
Is my URL stored or tracked?
No. The URL is fetched only to run the audit and the report is streamed back to you. Nothing about the request is logged, stored, or tracked, and no sign-up is required to use it for free.
Related tools
- Core Web Vitals Risk CheckFind markup that risks poor LCP, CLS and FCP. It reads the HTML and does not measure the page; use Lighthouse Audit for measured values.
- Page Speed SnapshotPageSpeed Insights summary for a URL — performance, accessibility, best-practices and SEO scores, Core Web Vitals and top fixes.
- On-Page SEO Health AuditorComprehensive audit of 45+ on-page SEO signals: title length, meta description, H1-H6 headings, canonicals, alt tags, Open Graph, schema, and robots directives.
- Page Speed Waterfall AnalyzerSimulate and visualize asset loading waterfall, TTFB latency, DNS resolution, and resource weight breakdown.
- ASN & BGP Route LookupInspect Autonomous System Numbers, BGP routing prefixes, and ISP origins.
- Broken Link CheckerCheck up to 200 links on one page and report broken, unreachable and redirecting links with status codes.
- Website Cache & Compression AuditorAnalyze HTTP cache headers (Cache-Control, ETag, max-age) and content compression ratios (Brotli, Gzip, Zstandard).
- Canonical Tag & Loop InspectorVerify canonical URL tags, detect self-referential links, cross-domain mismatches, loop redirects, and HTTP canonical headers.