Glossaire · SEO

SEO Cannibalization

SEO cannibalization is the situation where several pages on the same website rank for the same keyword or the same search intent, competing against each other in Google's results. Instead of concentrating authority and relevance signals on a single URL, the site dilutes its strength across redundant pages. As a result, Google struggles to choose the most relevant page, rankings fluctuate, and none of the URLs reaches its full potential. Cannibalization mainly affects large sites where blog posts, category pages and product pages cover topics that are too similar. You diagnose it in Search Console by spotting queries for which several URLs alternate in position, or through a semantic overlap audit. Fixing it involves merging, 301 redirecting, rewriting or selectively de-optimizing the conflicting pages so that one clear page wins.

SEO cannibalization is one of the most underestimated problems on sites that publish a lot of content. Several pages fight over the same query, and instead of adding up their efforts, they cancel each other out.

How it happens

Cannibalization is rarely deliberate. It builds up gradually: a blog post is written on a topic already covered by a service page, two near-identical product pages are created, or a redesign leaves the old and new version coexisting. Each page then targets the same keyword and the same search intent. Google receives contradictory signals about which URL to favor and spreads authority instead of concentrating it.

How to diagnose it

The most reliable diagnosis relies on Search Console: filter by query, then look at the associated pages. If several URLs share impressions and alternate in position from one week to the next, cannibalization is likely. Complement this with a semantic overlap analysis across titles, tags and body text. A well-built semantic silo prevents this type of conflict upstream by giving each page a distinct scope.

How to fix it

Three options depending on the case. Merge the pages into a single, more complete resource, then 301-redirect the old URLs. De-optimize the less strategic page by removing the signals that push it up on the query. Differentiate the intents if both pages deserve to exist, by rewriting the angle of each.

A retenir

One search intent, one page. Before publishing new content, always check that no existing page already targets the same query.

Addressing cannibalization gives Google a clear map of your site. Rankings stabilize, authority concentrates, and organic traffic often grows without creating a single extra page.

FAQ

Frequently asked questions

In Search Console, filter by query and check whether several URLs appear and alternate in position for the same keyword. A content overlap audit confirms which pages share the same intent and lexical field.

Not always. Two pages can coexist if they answer distinct intents. The problem arises when they target the same intent: Google hesitates, and rankings become unstable.

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