Canonical Tag Checker
Free online Canonical Tag Checker. Simple, fast, and secure tool running in your browser.
Free Online Canonical Tag Checker
Our Canonical Tag Checker is a free SEO tool that instantly fetches any webpage and inspects its HTML for a <link rel="canonical"> tag. It shows you the exact canonical URL set on the page, alerts you if no canonical tag is found, and helps you detect canonical misconfigurations before they cause SEO problems.
Canonical tags are one of the most important yet frequently misconfigured SEO elements. A missing, incorrect, or chained canonical can cause Google to index the wrong version of your page, split your link equity, or treat your content as duplicate — all of which can harm rankings.
Why Canonical Tags Matter for SEO
🔄 Prevent Duplicate Content
Multiple URLs serving the same content (HTTP vs HTTPS, www vs non-www, trailing slash vs no trailing slash) can be consolidated with canonical tags.
💪 Consolidate Link Equity
If external sites link to multiple URL variants of your page, canonical tags tell Google to pass all that PageRank to your preferred version.
🔗 Handle URL Parameters
Tracking parameters (UTM tags), session IDs, sorting options, and filters often create thousands of URL variants. Canonical tags collapse these to one indexable URL.
🌍 Cross-Domain Canonicals
Canonical tags can point to a different domain — useful for syndicated content where the original publisher wants to retain ranking credit.
How to Add a Canonical Tag to Your Page
Place the following tag inside the <head> section of your HTML:
Replace https://www.example.com/your-page/ with the preferred URL of the page. Use the absolute URL (including https:// and the domain), not a relative path.
Common Canonical Tag Mistakes to Avoid
Page A → canonical to Page B → canonical to Page C. Always canonical directly to the final preferred URL.
The canonical URL should return a 200 OK status, not redirect. Canonicaling to a 301 redirect creates a canonical chain.
Having more than one canonical tag on a page causes search engines to ignore all of them. Ensure each page has exactly one canonical tag.
Always use absolute URLs (https://...) in canonical tags. Relative URLs can cause unintended behavior when pages are syndicated.
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