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On-page SEO: indexability, HTTP headers, SERP preview, Web Vitals, keywords, headings, links, images, hreflang, AI crawlers. SEO Turtle Analyzer Free on-page SEO audits in one click. Open any page, click the icon, and get a technical and content audit across seven tabs. No account, no setup. INDEXABILITY VERDICT The first thing you see: can Google index this page, and why? Checks meta robots, the X-Robots-Tag header, canonical conflicts, and the live HTTP status, with plain-English reasons. OVERVIEW - Google snippet preview with pixel-width checks on title and description, measured the way Google truncates rather than by character count - Core Web Vitals from the current page load, plus real-user CrUX field data if you add a free API key - Primary and secondary keyword detection with placement across title, H1, H2, meta description and first paragraph - Word count and readability measured on the main content, so navigation and cookie banners don't skew the numbers - Mobile signals and an overall score TECHNICAL - HTTP header analysis from a fresh cookie-less request (what crawlers actually receive): status and redirects, X-Robots-Tag, Link canonical, compression, caching, ETag/Last-Modified, HSTS, Vary and CDN cache status, plus a raw header viewer - Canonical checks and hreflang validation, including fetching each alternate to confirm return tags - AI crawler access: what your robots.txt tells GPTBot, OAI-SearchBot, PerplexityBot and the other major AI bots, plus llms.txt detection - JSON-LD structured data types, flagged for rich-result eligibility - Quick links to robots.txt and your sitemaps CONTENT, LINKS, IMAGES, SOCIAL - Every heading in order, with structure warnings such as a missing H1 or skipped levels - Internal and external links with nofollow/sponsored/UGC flags, empty-anchor warnings and live status checks - Image audit: missing alt text, decorative images, missing dimensions (a layout-shift risk) - Open Graph and Twitter Card tags with a share preview EXPORT Copy a full text report for clients or colleagues, or copy headings, links and images as CSV. NEW IN 1.2 HTTP header analysis, a header-aware indexability verdict, and detection of the "none" robots directive. PRIVACY The extension runs in your browser and only when you click it (activeTab permission). No account, no analytics, nothing collected. Wider host access is requested only if you use link status checks or hreflang validation, and the optional CrUX key stays on your machine. Built by SEO Turtle (seoturtle.com). If a check looks wrong or you're missing a feature, tell us.