Prevent duplicate URL signals
Canonical tags help search engines understand which version of a page should be treated as the preferred URL.
Free Tool
Canonical URL Checker for Smarter Website Decisions
Check whether a canonical URL is valid, self-referencing and on the same origin as the page URL.
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What It Checks
Focus Areas for This Tool
These are the signals I would review manually when deciding what needs fixing first.
01
URL validity
Review this area to understand whether it is helping or hurting growth.
02
Self-canonical check
Review this area to understand whether it is helping or hurting growth.
03
Same-origin check
Review this area to understand whether it is helping or hurting growth.
04
Canonical output
Review this area to understand whether it is helping or hurting growth.
Optimization Guide
How This Tool Helps Before Publishing
A little context makes the numbers more useful. Use these notes to understand where this tool fits inside content, SEO and website reviews.
Check migration details
During redesigns, platform moves and URL cleanup projects, compare old and new canonical patterns before publishing.
Catch cross-domain mistakes
A canonical pointing at another origin can be intentional, but accidental cross-domain canonicals can suppress important pages.
Review query and fragment handling
The checker highlights path, query string, absolute URL and fragment differences that are easy to miss in manual reviews.
FAQs
Frequently Asked Questions
Quick answers about how this tool works and when to use it.
It compares a page URL and canonical URL for validity, same-origin status, exact self-canonical matching, path and query consistency, absolute URL format and fragments.
Yes. Absolute HTTP or HTTPS canonical URLs are easier for crawlers to interpret consistently than relative canonical paths.
No. Cross-domain canonicals can be intentional for syndicated or duplicate content, but they should be reviewed carefully because they can consolidate signals away from the current page.
No. This browser-based checker compares the URLs you enter. Use it for quick validation while reviewing markup, templates or migration spreadsheets.