Canonical URL
Last updated: March 2025
Definition
A tag that tells Google 'this is the original version of this page.' Used when the same content exists at multiple URLs (print versions, tracking parameters, syndicated copies). Without it, Google picks which version to index, and it might pick the wrong one.
Why It Matters
Duplicate content dilutes your ranking signals. Google splits authority between the copies instead of consolidating it on one URL. Canonical tags solve this by pointing all versions to the one you want indexed. It's a simple fix that prevents a common technical SEO problem.
How to Improve
- Add self-referencing canonical tags to every page. Even pages without duplicates benefit from declaring themselves canonical.
- When syndicating content to Medium or LinkedIn, make sure the canonical points back to your original URL.
- Audit pages with UTM parameters or session IDs in URLs. These create accidental duplicates that need canonicalization.
- Check Google Search Console for duplicate content warnings. Fix canonicals for any flagged pages.