Check a page canonical tag
Inspect a public page for its canonical link, compare it with the tested URL and flag missing or cross-domain canonicals.
Reads the canonical link from the public HTML and compares it with the tested URL.
How to use the Canonical Tag Checker
Inspect a public page for its canonical link, compare it with the tested URL and flag missing or cross-domain canonicals.
Formula and method
The checker reads the first HTML link element whose rel attribute contains canonical and resolves relative URLs against the tested page.
Example
Enter a page URL to see whether its canonical is missing, self-referencing or points to another URL.
Planning examples
These examples are mathematical scenarios designed to help with planning. They are not claims about typical market performance.
| Use | Recommendation |
|---|---|
| Planning | Use your own recent data whenever possible. |
| Comparisons | Keep the same definition and time period across comparisons. |
| Benchmarks | Treat public benchmarks as context rather than guarantees. |
How to interpret the result
Canonical tags are hints for duplicate consolidation. They should normally point to the preferred indexable URL and stay consistent with redirects, internal links and sitemaps.
Frequently asked questions
Does this tool use an external API?
No. The calculation runs from the values you enter.
Is the result a guarantee?
No. It is a mathematical planning result based on your inputs.
Can I use my own real data?
Yes. Your own recent account or business data is usually the best input.
Can I compare different platforms?
Use caution because metric definitions and monetization models can differ by platform.