What Is Duplicate Content?
Duplicate content is content that appears at more than one URL on the web. It can be the same content on your own site (internal duplicates) or your content copied on another site (external duplicates). Google does not penalise duplicate content directly, but it does cause problems.
How Duplicate Content Hurts SEO
- Split link equity — backlinks are spread across multiple URLs instead of consolidating on one
- Wasted crawl budget — Google crawls multiple versions of the same page unnecessarily
- Wrong version ranks — Google may choose to rank a different version than you intended
- Diluted rankings — multiple pages competing for the same keyword cannibalise each other
Common Causes
| Cause | Example | Fix |
|---|---|---|
| WWW vs non-WWW | site.com/page and www.site.com/page | Redirect one to the other |
| HTTP vs HTTPS | Both protocols serve the same content | 301 redirect HTTP to HTTPS |
| Trailing slashes | /page and /page/ both work | Pick one, canonical tag the other |
| URL parameters | /page?sort=price and /page?sort=date | Canonical tags or parameter handling in Search Console |
| Pagination | Same intro text on every paginated page | Unique content per page or rel=next/prev |
| Printer-friendly pages | /page and /page/print | Canonical to the main version |
How to Find Duplicate Content
Use the site audit or bulk checker — both detect duplicate titles and descriptions across your pages. The canonical URL checker verifies each page has a canonical tag set.
Check your site: Run a free audit on the RankNibbler homepage — 30+ SEO checks with no signup required.
Last updated: March 2026