What should a canonical tag look like?

An absolute URL in inside the page's , matching the page's own preferred URL.

Does this fetch my page for me?

No — paste the HTML directly. Nothing is uploaded or fetched from a URL.

Paste a page's HTML to verify its canonical tag is present, absolute, unique, and matches the page's own URL.

This page's URL (optional, to check the canonical matches)Page HTML (view-source or the <head> section)

Canonical found

https://example.com/page

Issues

No issues found.

Checking happens entirely in your browser — the HTML you paste is never uploaded anywhere.

Processing happens locally in your browser. Nothing you enter is uploaded.

Optionally enter the page's own URL, paste its HTML, and review the canonical tag found and any issues.

A page missing <link rel="canonical"> entirely, or with two conflicting canonical tags, is flagged as an error.

What should a canonical tag look like?: An absolute URL in <link rel="canonical" href="https://..."> inside the page's <head>, matching the page's own preferred URL.
Does this fetch my page for me?: No — paste the HTML directly. Nothing is uploaded or fetched from a URL.

H1/H2 Heading Analyzer