Free technical SEO checkers

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• Robots.txt checker and tester
  Check a site's robots.txt, see whether it blocks crawlers, and test whether a path is allowed for Googlebot.
• XML sitemap validator
  Validate an XML sitemap: check the format, count URLs and find duplicates, http links and URLs on other hosts.
• Redirect checker
  Follow a URL's redirects step by step and find long chains, loops and temporary redirects.
• HTTP header checker
  See a URL's status code and response headers, including X-Robots-Tag and common security headers.
• Structured data checker
  Find JSON-LD structured data on a page, catch invalid JSON and missing key properties.
• Hreflang checker
  Check a page's hreflang tags for duplicates, invalid codes, a missing x-default and a missing self-reference.