Technical SEOPublished02.05.2026

Duplicate Content in E‑commerce

The duplicate content problem in online stores: one product in multiple categories, filters, sorting parameters and pagination create thousands of identical URLs.

In brief

Duplicate Content in E‑commerce occurs when the same content is accessible via many URLs due to CMS features: multiple categories, filters, sorts, session parameters, and pagination.

What is duplicate content in e‑commerce

Duplicate content in stores. One product in multiple categories, filters, variations create duplicates. Duplicate Content in E‑commerce occurs when one product is accessible via several URLs.

Sources of duplicates

  • Multiple categories — product in 2–3 categories
  • Filters — thousands of URLs from combinations
  • Sorting — ?sort=price, ?sort=name
  • Pagination — ?page=2, ?page=3
  • Session parameters — ?sessionid=xxx
  • HTTP vs HTTPS — different protocols
  • WWW vs non‑WWW — different versions

Duplicate examples

TEXT
/category1/product-name
/category2/product-name
/products/product-name
/products/product-name?color=red
/products/product-name?color=red&size=M

Solutions

  • Multiple categories → Canonical to the main category
  • Filters → Canonical or noindex
  • Sorting → Canonical to the non‑parameter version
  • Pagination → rel="next"/"prev" or canonical
  • Session parameters → configure URL Parameters in GSC

Canonical strategy

HTML
<!-- Main product URL -->
<link rel="canonical" href="https://example.com/electronics/iphone-15-pro" />

<!-- On all duplicates (other categories, filters) -->
<link rel="canonical" href="https://example.com/electronics/iphone-15-pro" />

URL parameters in GSC

Google Search Console → Legacy tools → URL Parameters. Here you can tell Google how to treat parameters: sort — doesn't change content, page — pagination, sessionid — no effect.

Use noindex on filter pages that have no search demand (e.g., unusual combinations). But do not block popular filters — they can bring valuable traffic.
FAQ

Common questions

For popular filters (e.g., 'red sneakers'), use canonical to keep ranking potential. For unpopular combinations, use noindex.
No, blocking in robots.txt doesn't fully save budget and may prevent bots from seeing canonical. Better manage via GSC URL Parameters and meta robots.
Google no longer supports rel=next/prev officially but may still respect it. Safer to use canonical to page 1 for deep paginated pages, though page 2 may not be indexed. Alternative: keep pagination without canonical but block deep pages (e.g., page=100) via URL Parameters in GSC.
Set up 301 redirects from www to non‑www (or vice versa) and from http to https. Also use canonical to the preferred version.
Use Screaming Frog (Duplicate Content report), Google Search Console (Pages report), and check how many pages have identical titles and descriptions.
Direct contacts

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