What is Duplicate Content?
Definition
Duplicate content is substantively similar or identical content appearing at multiple URLs — either within the same site or across different sites. It creates a 'which version should I rank?' problem for search engines and dilutes ranking signals. Canonical tags are the primary solution.
Why Duplicate Content matters for Shopify stores
Shopify has a known duplicate content issue: products can appear at both `/products/[handle]` and `/collections/[collection]/products/[handle]`. Shopify automatically adds canonical tags pointing to the `/products/` URL, but themes and apps sometimes override this incorrectly.
Shopify example
A product available in a 'Summer Collection' appears at both `/products/linen-dress` and `/collections/summer/products/linen-dress`. The canonical tag on both pages should point to `/products/linen-dress` — which Shopify handles by default, unless overridden.
How Sauron handles Duplicate Content
Sauron's store scan checks that canonical tags are correctly set on all product pages, flagging any theme or app overrides that break Shopify's default canonical behaviour.
Common mistakes
- ✕ Allowing apps to set their own canonical tags that override Shopify's defaults
- ✕ Running the same products across multiple storefronts without canonical cross-referencing
- ✕ Using identical boilerplate descriptions for variant products (e.g., same shirt in different colors)
- ✕ Not canonicalising paginated collection pages (/collections/all?page=2)
Related terms
Automate your Shopify SEO
Understanding Duplicate Content is step one. Sauron handles the implementation — automatically, for your entire Shopify store.