SEO Audit - RankNibbler

Instant on-page SEO audit for any page: titles, meta, headings, links, structured data and more. No sign-up, no API key.

Audit the SEO of any web page in one click. RankNibbler SEO Audit runs 83 checks across 10 categories and gives you a weighted A-F score, a category breakdown, and a specific fix for everything that needs attention. It is fast and completely private. The whole audit runs locally in your browser: the extension reads the current page when you click the icon, analyses it on the spot, and sends nothing anywhere. No sign-up, no API key, no account required to use it. What it checks: - Meta: page title, title length, meta description, canonical URL - Content: word count, text-to-HTML ratio, readability, placeholder text, top keywords - Headings: single H1, H2 subheadings, heading outline and hierarchy - Images: missing alt text, width/height, lazy loading, modern formats - Links: internal vs external, empty links, generic anchor text, social profiles, feeds - Structured data: JSON-LD validity, schema fields, Open Graph, Twitter Card - Technical: indexability, HTTPS, viewport, charset, lang, doctype, hreflang, URL structure - Performance: render-blocking resources, CSS/JS counts, HTML and DOM size, TTFB, page weight - Accessibility: skip link, semantic landmarks, form input labels - Tech stack: CMS, framework, analytics, CDN and SEO plugin detection Click any result to see the detail and a recommended fix, re-scan after a change, or copy a plain-text report to share.