SEO Tools Centre: On-Page SEO Checker EN

Check the on-page SEO of any web page in one click, free and with no sign-up.

Click the icon on any page and SEO Tools Centre's checker reads it and tells you what to fix first. Each result says why it matters in plain English.

WHAT IT CHECKS
• Title tag: length in characters and in pixels, so you know if Google will cut it off
• Meta description: missing, too short, or too long for search results
• Indexing: noindex in the robots meta tag
• Canonical URL: missing, or pointing to a different page
• Headings: missing or multiple H1s, skipped levels, the full H1–H6 outline
• Content length: word count
• Images: alt attributes missing, empty or present, with a highlight on the page
• Links: internal, external, nofollow, sponsored and UGC, with anchor text and CSV export
• Structured data: JSON-LD and microdata types, and JSON-LD that fails to parse
• Social sharing: Open Graph and X (Twitter) card tags with a share preview
• Basics: HTTPS, language attribute, mobile viewport, favicon, hreflang

GOOGLE SNIPPET PREVIEW
See the page as a Google search result, with pixel-width meters for the title and description.

COPY AND EXPORT
Copy a plain-text report, the title and description, or the link list as CSV.

PRIVATE BY DESIGN
The extension reads the page only when you click its icon. Everything runs in your browser: no account, no tracking, and nothing is sent to any server.

GO DEEPER
Each tab links to a matching free tool on SEO Tools Centre, such as the AI Search Visibility Checker, SERP Snippet Preview, Broken Links Checker and Schema Markup Generator. More than 100 free SEO and writing tools: https://seotoolscentre.com/