Do similar contents really compete with each other when it comes to backlinks?

What exactly does Google say about backlink dilution?

John Mueller points out a phenomenon that is often observed but rarely explained by Google: multiple pages with closely related editorial positioning fragment the value of backlinks. Specifically, if five pages address a nearly identical topic, each will receive only a fraction of the overall authority that incoming links could have conferred to a single page.

This statement validates the concept of backlink cannibalization, which is distinct but related to keyword cannibalization. Google does not mechanically accumulate link power — it distributes it based on relevance and internal structure. A strong URL captures more juice than a host of weak URLs.

How is this different from classic keyword cannibalization?

Classic cannibalization involves indexing conflict: Google does not know which page to display for a given query. Here, the problem is different: even if Google manages to differentiate the pages, the impact of backlinks remains dispersed.

For example: if three average articles each receive 10 backlinks and are merged, a single article now receives all 30 links and benefits from a threshold effect that is much stronger in terms of ranking. The whole is not equal to the sum of the parts — an authoritative page will always outperform three mediocre pages.

Does Google quantify this loss of effectiveness?

No. Mueller remains intentionally vague about the exact extent of this dilution. No figures, no ratios, no similarity thresholds are provided. It is unclear at what level of resemblance the phenomenon activates or how Google measures "similarity" between contents.

This is a recurring Google pattern: confirming a principle without providing a measurable lever. For practitioners, this means working on instinct and manual audits rather than with clear KPIs. The decision to merge or not remains subjective.

• Similar pages: share the value of backlinks instead of accumulating it
• Editorial consolidation: an often underestimated lever to maximize the authority of a URL
• No official metrics: impossible to precisely quantify the loss of power
• Distinct from classic cannibalization: even if Google differentiates the pages, the SEO impact remains diluted
• Threshold effect: a strong page with 30 backlinks consistently outperforms three pages with 10 backlinks each

Is this statement consistent with field observations?

Yes, and it is even one of the few statements from Mueller that perfectly aligns with content audits. I've seen dozens of sites multiply "close" landing pages for slightly varied queries, with disastrous results. Each page stagnates on pages 3-4, and none gain traction.

Merging these pages onto a well-structured pivot URL? Ranking jumps in 70% of observed cases, often within weeks. The phenomenon is particularly noticeable in B2B niches where backlink depth makes the difference. A page with 50 referring domains beats ten pages with 5 referring domains each.

Where does Google draw the line for “similarity”?

That's the real problem. Mueller gives no objective criteria. Is it identical Hn structure? The semantic field? The title tag? A common search intent? Probably a mix, but impossible to pinpoint.

In practice, I consider two contents similar if their overlap of ranking keywords exceeds 60% and they address the same primary question. But that’s a personal heuristic, not a Google rule. [To verify]: Does Google use semantic embeddings to calculate this proximity, or does it rely on more basic signals?

In what cases can we still maintain several close pages?

If the user intent truly differs. For example: "CRM for startups" vs. "CRM for SMEs" may justify two pages if the needs, testimonials, and highlighted features diverge. But caution: the gap must be significant, documented by keyword research and validated by distinct user behavior (bounce rate, time on page).

Another exception: geolocated contents. Ten similar pages for ten cities can be justified if each receives specific local backlinks and serves a clear local intent. Again, Google typically knows how to differentiate. But dilution remains a risk if the backlinks are not geo-targeted.

How to audit your site to identify these similar contents?

First step: export all indexed URLs with their backlink profile (Ahrefs, Majestic, Semrush). Cross-reference with a Screaming Frog or Oncrawl crawl to retrieve titles, H1, and word count. Look for clusters: pages that share 60% or more of ranking keywords or whose titles/H1 differ only by minor variations.

Second filter: manual content analysis. Two pages may have different titles but address exactly the same issue. Read the introductions, compare structures. If you could interchange the contents without the user noticing, that’s a red flag.

What consolidation strategy should be adopted?

Identify the pivot page: the one with the best backlink profile, the best traffic history, or the best editorial structure. It will be the one that survives. Integrate the best aspects of the other pages: unique sections, examples, data, testimonials.

Then, implement permanent 301 redirects from the sacrificed pages to the pivot page. Ensure that your internal linking now points exclusively to this URL. Monitor for 4-6 weeks: you should see the pivot page rise, sometimes dramatically if the consolidation was expected.

What mistakes should absolutely be avoided in this process?

Never delete content without a redirect. Each sacrificed URL must point in 301 to the pivot page, otherwise you permanently lose the juice of backlinks. A common mistake: leaving 404s or chains of multiple redirects.

A second trap: merging without reworking the structure. If you just stack three articles together, you end up with an unpleasant block of 5000 words. Restructure with clear H2/H3s, a clickable summary, and distinct sections. The pivot page must be better than the sum of the original pages, not just longer.

• Export all indexed URLs with their backlink profile and ranking keywords
• Identify clusters of content sharing 60% or more thematic similarity
• Choose a pivot page based on the best backlink profile and traffic history
• Merge contents by restructuring (not just stacking)
• Set up permanent 301 redirects to the pivot page
• Audit and correct internal linking to point exclusively to the new URL
• Monitor rankings and traffic over 4-6 weeks to validate the impact