Canonical Checker
Paste page HTML with an optional page URL, or enter a page URL and canonical URL manually. Review tag counts, syntax errors, URL consistency notes and an escaped HTML tag without fetching any page.
Canonical checker
Ready for local analysis.
- Canonical tags
- 0
- Errors
- 0
- Review notes
- 0
- Canonical URL length
- 0
A QUICK WALKTHROUGH
How to use this tool
- Paste HTML, or fill both URL fields for manual analysis.
- Analyze the canonical URL and review errors, placement and consistency notes.
- Confirm the preferred URL and copy the suggested tag into the page head.
Local source inspection
HTML mode detects missing and duplicate canonical links, placement in the parsed head or body, URL format and og:url consistency. Manual mode compares the two supplied URLs and cannot verify HTML placement or metadata.
Review URL policy
Checks cover HTTPS, trailing slashes, query parameters, fragments, self-reference, host and protocol differences, length and encoding. These are syntax and policy hints, not indexing guarantees. No redirects, HTTP responses, robots rules or target availability are checked. Input is limited to 500,000 source characters, 10,000 parsed elements and 8,192 characters per URL.
GOOD TO KNOW
Common questions
Does this visit my page?
No. Paste its source yourself; processing stays in your browser.
Is a cross-domain canonical always wrong?
No. Confirm that the chosen relationship and preferred page are intentional.