Free SEO Tool
Canonical Tag Checker
Verify your canonical tags are correct and prevent duplicate content issues from harming your search rankings.
Understand canonical tags
These guides explain how to fix the issues this tool uncovers.
Verify canonical tags site-wide?
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Frequently Asked Questions
A canonical tag tells search engines which version of a page is the preferred or original one when similar or identical content exists at multiple URLs. This prevents duplicate content issues and consolidates ranking signals to a single URL.
Yes, best practice is to include a canonical tag on every page. Even if no duplicate content exists, a self-referencing canonical clearly identifies the preferred URL to search engines and ensures consistent indexing behavior.
A self-referencing canonical (pointing to the current page) is recommended as a best practice. It explicitly signals to Google that this URL is the canonical version. This is especially important if there are any parameters or variations of the URL.
Canonical tags affect duplicate content handling, which URL gets indexed, and where ranking signals are consolidated. An incorrect canonical tag can prevent your preferred page from being indexed, while a missing canonical can dilute your ranking power across multiple URL variations.
Remove duplicate canonical tags immediately. Each page should have only one canonical tag. Check your site templates, CMS configuration, and plugins to identify where duplicates are being generated, then remove the extras.