On-Page SEO

How to Use a Keyword Cannibalisation Checker for Better SEO

Graham keywordnumbersJuly 8, 20266 min read

If your site’s rankings are stalling or dropping, keyword cannibalisation could be the culprit. In this guide, you’ll learn what keyword cannibalisation is, why it matters, and how to use a dedicated keyword cannibalisation checker to spot and fix it. We’ll also cover practical steps to improve your keyword research and on-page SEO strategy.

What is Keyword Cannibalisation?

Keyword cannibalisation happens when several pages on your website compete for the same or very similar keywords. Instead of one strong page ranking highly, search engines see multiple pages and get confused about which to prioritise. This dilutes your authority, splits your traffic, and can drag your rankings down.

Example:*

You run a gardening blog. You have two posts:

"How to Grow Roses in Containers"

"Tips for Container Gardening with Roses"

Both target "container roses" and "growing roses in pots."

Google isn’t sure which to rank for queries like "how to grow roses in pots"—so neither page ranks as well as it could.

Why Keyword Cannibalisation is Bad for SEO

When your own pages compete, you may experience:

Lower click-through rates (CTR) across your site

Fluctuating or declining rankings

Wasted crawl budget as Google indexes overlapping content

Confused users, leading to higher bounce rates

How to Identify Keyword Cannibalisation

You can manually search for cannibalisation by Googling site:yourdomain.com keyword and reviewing which pages show up. But this is slow and easy to overlook.

A faster, more accurate approach is to use a free keyword cannibalisation checker like the one on KeywordNumbers. This tool scans your site and finds pages competing for the same keywords, saving hours of manual work.

Worked Example: Detecting Cannibalisation

Suppose you run a cycling blog, and you want to check for cannibalisation around the keyword "best road bike tyres." You enter your domain and target keyword into the checker.

Results:*

Page URL	Target Keyword	Ranking Position	Monthly Traffic (UK)	Monthly Traffic (US)
/road-bike-tyres-guide	best road bike tyres	8	180	220
/road-bike-tyres-review	best road bike tyres	14	120	160

You see two pages both trying to rank for the same phrase. The checker highlights the overlap and suggests next steps—such as merging the articles, rewriting one to focus on a different query, or consolidating internal links.

How a Keyword Cannibalisation Checker Works

A robust checker typically:

Crawls your site for top-ranking pages

Analyses each page’s primary keywords

Flags pages with overlapping or identical target keywords

Provides actionable recommendations (combine, redirect, or re-optimise)

The KeywordNumbers free checker makes this process simple and visual, helping you fix issues fast.

Best Practices for Preventing Cannibalisation

Map Your Keywords: Assign a unique primary keyword to each page.

Audit Regularly: Use a checker tool monthly, especially after adding new content.

Update Old Content: Merge or redirect older posts that overlap with new, better-performing pages.

Optimise Internal Links: Ensure related pages point to your main, most relevant page for each keyword.

How to Check Your Keywords

Beyond cannibalisation, effective keyword tracking is vital for ongoing SEO. Here’s how to do it:

Use Keyword Research Tools: Find what your audience is searching for and spot gaps in your content.

Track Rankings: Monitor how each page performs for its target keywords.

Review Search Intent: Make sure content aligns with what users want to see for each query.

Questions People Are Actually Asking

What is keyword cannibalisation?

Keyword cannibalisation is when multiple pages on your own site compete for the same or very similar keywords, making it harder for any single page to rank well in search results.

How to identify keywords?

Start by using keyword research tools to discover what your target audience is searching for. Assign one main keyword to each page, and use a cannibalisation checker to monitor for overlaps.

How to check keywords?

Check keyword rankings using SEO tools that track your page positions in search engines. You can also manually search with site:yourdomain.com keyword to see which pages Google is listing for your chosen term.

How to fix keyword cannibalisation?

Fix cannibalisation by merging similar pages, deleting outdated content, using 301 redirects, or re-optimising pages to target different keywords. Always ensure each page has a unique keyword focus.

Does keyword cannibalisation affect all websites?

Any site with a growing content library can encounter cannibalisation, but it’s especially common on blogs, e-commerce sites, and large company websites. Regular audits can prevent major issues.

Can keyword cannibalisation impact my rankings in different countries?

Yes. If multiple pages compete for the same keyword, it can dilute authority and lower rankings in any country where you’re targeting that keyword, regardless of the currency or language variant.

How often should I check for keyword cannibalisation?

It’s best to check at least every few months, or whenever you publish new content in a niche you’ve written about before. Regular use of a checker tool makes this much easier.

Conclusion

Keyword cannibalisation can quietly undermine your on-page SEO efforts, but it’s easy to spot and fix with the right tools. Regularly using a free keyword cannibalisation checker will help you keep your content focused, your rankings strong, and your traffic growing. Give it a try now to see where you can improve!

Free tools to put this into practice

Reading is one thing — testing your own pages is what moves the needle. Here are the free KeywordNumbers tools that pair best with this guide:

Keyword Search Volume Checker — see estimated monthly searches, trends and seasonality for any keyword.

AI Keyword Ideas — generate fresh, related keyword ideas around your topic in seconds.

Keyword Density Checker — check how often your target terms appear so your content reads naturally.

Every one of our free SEO tools is genuinely free to use, with no sign-up required.

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