Free Canonical Tag Checker
Verify canonical tags, detect duplicate content issues, and check redirect chains in real-time — as crawlers see them. Free, no signup required.
Enter a URL to check
Verify your canonical tag setup and detect common duplicate content issues.
100% free
No credit card, no trial
No signup needed
Use it right away, no account
Results in seconds
Enter your input and go
Why Canonical Tags Matter
Duplicate content can split your ranking power across multiple URLs. Without a canonical tag, Google decides which version to index — and it often picks the wrong one, diluting your authority and hurting your positions.
Duplicate Prevention
Canonical tags consolidate ranking signals to your preferred URL, ensuring Google indexes the right page and directs link equity correctly.
Issue Detection
Misconfigured canonicals after CMS migrations, parameter-driven URLs, or redirects are common but invisible — this tool surfaces them instantly.
- A canonical pointing to a 404 page signals conflicting content ownership to Google
- E-commerce filter URLs without canonicals can generate hundreds of duplicate pages
- Redirects that break canonical alignment are a common technical SEO issue
How to Use
Four steps from URL to full canonical analysis in seconds.
Enter URL
Paste the full page URL to check, including https://.
Fetch & Analyze
We fetch the page like a crawler (following redirects, without running JavaScript) and extract the canonical tag, meta robots, and og:url.
Review Status
See if canonical is self-referencing, pointing elsewhere, or missing.
Fix Issues
Follow the recommendations to resolve any problems found.
Use Cases
Canonical issues appear in every type of site — here's where this tool is most valuable.
E-commerce
Ensure product variants and filter URLs do not create duplicate content that splits your ranking power.
Multi-language Sites
Check that each language variant has its own self-referencing canonical so variants do not compete against each other.
Site Migrations
Check canonical tags survived the URL change. Broken canonicals after migrations quietly kill rankings.
CMS Platforms
Detect auto-generated canonical issues in WordPress, Shopify, and other platforms.
Frequently Asked Questions
What is a canonical tag?
A canonical tag (<link rel="canonical">) tells search engines which URL is the "official" version of a page. It prevents duplicate content issues when multiple URLs serve similar or identical content.
What does "Points Elsewhere" mean?
It means the canonical tag on this page points to a different URL. This tells Google to index the other URL instead of this one. This is intentional for duplicate variants but a problem if misconfigured.
What does "Self-Referencing" mean?
The canonical tag points to the same URL being checked. This is the correct setup for most pages — it confirms this is the preferred version for indexing.
Should every page have a canonical tag?
Yes. Every indexable page should have a self-referencing canonical tag. Pages that are duplicates or variants should point their canonical to the preferred version.
Does this tool follow redirects?
Yes. If the URL redirects, we follow it to the final destination, show you where it ends up, and analyze the canonical tag on that destination page. A canonical that matches neither the URL you entered nor the final URL is reported as "Points Elsewhere".
Don't Let Duplicate Content
Kill Your Rankings
LazySEO automates keyword research, content creation, and publishing — so you rank on Google and AI search engines without the manual work.
$1 today, then $39/mo. Cancel anytime.
Key terms explained
Plain-English definitions from the LazySEO SEO glossary.