Free Website Checkers & SEO Tools

Each checker runs a focused part of the full Nalyzed analysis and takes you straight to the result. No signup, no limits beyond fair-use rate limiting.

• SSL Certificate Checker

  Check any website's SSL/TLS certificate: whether it is trusted, who issued it, when it expires, and whether HTTP redirects to HTTPS.

• Security Headers Checker

  Scan a website's HTTP response headers for HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy.

• SPF & DMARC Checker

  Look up a domain's SPF and DMARC records, including the organizational-domain fallback used for www and other subdomains, and see the DMARC policy.

• Technology & CMS Detector

  Find out which CMS, framework, ecommerce platform, analytics, CDN and hosting a website uses. Detects 200+ technologies from real page artifacts.

• AI Crawler Access Checker

  Check whether a website's robots.txt allows or blocks AI crawlers: GPTBot, OAI-SearchBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot and more.

• llms.txt Checker

  Check whether a website publishes an llms.txt file and whether it follows the llmstxt.org structure: H1 title, summary, sections and links.

• llms.txt Generator

  Free llms.txt generator. Fill in your site name, summary and key pages to produce a valid llms.txt file following the llmstxt.org format.

• robots.txt Tester

  Paste a robots.txt file and test whether Googlebot, Bingbot or AI crawlers may fetch a URL path. Follows RFC 9309 longest-match rules.

• XML Sitemap Checker

  Find a website's XML sitemap from robots.txt Sitemap: lines or the default location, check that it parses, and sample the pages it lists.

• Website Speed Test

  Free website speed test: mobile and desktop Lighthouse scores, LCP, CLS, INP and TTFB, plus accessibility, SEO and best-practice scores and total page weight.

• Website Carbon Calculator

  Estimate the CO₂ emitted by one visit to a website from its measured page weight, using the Sustainable Web Design model.

• Canonical Tag Checker

  Check a site's canonical tags across a sample of pages: missing, invalid, pointing off-site, pointing at a different page, or combined with noindex.

• Hreflang Checker

  Check a multilingual site's hreflang annotations: invalid language tags, unreachable alternate URLs and missing reciprocal links within the checked sample.

• Redirect & Broken Link Checker

  Check a website's internal links for broken targets and multi-hop redirect chains, and see where each redirect actually lands.

• Duplicate Title & Description Checker

  Find pages sharing the same title or meta description, plus titles and descriptions that are missing or the wrong length to display in full.

• Structured Data Checker

  Check a website's JSON-LD structured data: which schema.org types it declares, syntax errors, and required fields missing from Product, Article, LocalBusiness and Organization markup.

• Core Web Vitals Checker

  Check a website's Core Web Vitals: real-user LCP, INP and CLS from the Chrome UX Report alongside a fresh Lighthouse lab run, for mobile and desktop.

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