Canonical URLs: Complete Guide to Avoiding Duplicate Content
Use canonical URLs to solve duplicate content and consolidate link equity.
Canonical URLs tell Google which page version is the "master" copy, preventing duplicate content issues.
Duplicate Content Causes
URL parameters, HTTP/HTTPS variants, www/non-www, trailing slashes, pagination.
Implementation
Add canonical tag to every duplicate page pointing to preferred version. Self-reference on the canonical page.
Best Practices
Use absolute URLs. Don't canonicalize to redirects. Include on every page.
Pro Tip
Every page should have a self-referencing canonical, even unique ones.
Generate correct canonical URLs with our Canonical Generator.
Try Free ToolFrequently Asked Questions
What Is It?
<link rel="canonical" href="..."> in your <head> specifies the preferred version.