What Is Keyword Cannibalisation in SEO?

It sounds dramatic, but keyword cannibalisation simply means two or more of your own pages are competing for the same search term. Instead of helping you, they undermine each other.

It is a common problem on sites that have grown over time, and the fix is usually straightforward once you know what to look for.

How it happens

As a site grows, it is easy to end up with several pages covering very similar ground: an old blog post, a newer guide, and a service page all touching the same topic, for example.

When Google sees multiple pages targeting one search, it is unsure which to rank. Rather than picking a clear winner, it may rank none of them well, splitting your potential traffic.

How to spot it

A telltale sign is several of your pages flickering in and out of the same ranking positions, or none of them ranking as well as you would expect for an important term.

You can also search your own site for a key term and see how many pages target it. If two or three are clearly going after the same thing, you likely have cannibalisation.

How to fix it

The usual solution is to consolidate. Merge the competing pages into one strong, comprehensive page and redirect the others to it, so all your ranking strength points to a single target.

Where pages genuinely cover different angles, the fix is to make their focus distinct and link them sensibly. A clear content structure prevents the problem returning.

Fixing cannibalisation on your existing site

Once you have identified cannibalising pages, the fix depends on severity. If two pages target the same keyword with similar content, consolidate them into one stronger page and redirect the weaker URL with a 301. If the pages cover different aspects but share keyword overlap, make their focus more distinct through clearer title tags, headings and content structure.

Use canonical tags sparingly as a fix — they are best suited to technically duplicate pages (printer-friendly versions, parameter URLs) rather than as a substitute for proper content differentiation. We identify and resolve cannibalisation as part of technical SEO audits, with before-and-after ranking tracking to confirm positions stabilise after changes are made.