Understanding How Internal Linking Affects Topical Authority
Today’s question focuses on internal linking and how it influences a search engine’s understanding of a page’s topical relevance and authority.
Question:
How can you technically evaluate whether a website’s internal linking is strengthening topical authority or actually weakening it?
What Is Topical Authority?
Topical authority refers to how well a search engine perceives a website as a reliable source of information on a particular subject. This perception develops when a site consistently covers a topic and signals reinforce that expertise.
Although there is no single official metric for measuring topical authority, it generally reflects how relevant and trustworthy a page or website appears within a specific knowledge area.
How Internal Links Influence Topical Authority
Internal links play a major role in shaping topical authority. They help distribute signals of relevance, intent, and authority across a website or within specific sections.
If backlinks bring authority into a website, internal linking distributes that authority across the site. In other words, internal links determine where that authority accumulates and help search engines understand a page’s topical focus.
When links connect topically related pages, they strengthen the authority of the destination page. However, if a page receives many links from unrelated pages, this can dilute its perceived topical relevance.
Understanding the concept of PageRank is important here. Developed by Google founders Larry Page and Sergey Brin in the late 1990s, PageRank evaluates a page’s importance based on the number and quality of links pointing to it. This principle still influences how internal linking affects the perceived authority of pages.
How Important Are Internal Links for Topical Authority?
Several elements of internal links influence how effectively they strengthen topical authority.
1. Whether the Link Passes Authority
First, determine whether the link is followable or marked with attributes like rel="nofollow" or rel="sponsored". These tags act as hints rather than strict rules, meaning search engines may sometimes ignore them.
Both the linking page and the destination page must also be crawlable. If either page is blocked in robots.txt, search engines cannot crawl the link, and authority will not pass through it.
2. Where the Link Appears on the Page
The placement of a link may also influence its effectiveness.
For example, links placed in the footer across every page might carry different weight compared to links embedded within the main body content.
Google’s Martin Splitt has explained that search engines treat different parts of a page differently when determining its topic. Content considered “main content” usually carries the most weight.
Meanwhile, John Mueller has said there is no measurable difference in link value based purely on location. The distinction is that Splitt refers to content importance for topic understanding, while Mueller refers specifically to link value.
Following this logic, links within the main content area may contribute more strongly to topical relevance signals.
3. Anchor Text
Anchor text (or image alt text when an image is linked) helps search engines understand the subject of the destination page.
The words used in the link provide context for both users and search engines, signaling what the user should expect after clicking the link.
Strong, descriptive anchor text reinforces the topical relevance of the destination page.
4. Topical Relationship Between Pages
Internal links work best when they connect pages covering similar topics.
For example, imagine an ecommerce hobby site:
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Page A: Overview of craft hobbies
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Page B: Textile crafts
A link from Page A to Page B reinforces Page B’s relevance for users interested in craft-related topics.
How to Evaluate the Impact of Internal Linking on Topical Authority
Internal links strengthen topical authority by reinforcing relevance and ensuring that external authority signals reach the right pages.
While it is possible to calculate link equity flow using complex models that consider factors such as:
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Link placement
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Click depth from authoritative pages
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Authority of the linking pages
these calculations can become extremely complex.
A simpler and practical approach works well in most cases.
Step 1: Identify Where Internal Links Are Coming From
Start by crawling your website and collecting a sample of URLs.
Export all internal links pointing to these pages, including:
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Anchor text
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Source URL
Step 2: Group URLs Into Topic Clusters
Organize pages into topical groups.
For example, on a hobby ecommerce site:
Crafts → Textile Arts
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Knitting
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Crochet
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Embroidery
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Weaving
Crafts → Cutting & Engraving
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Die cutting
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Digital cutting
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Laser cutting
This clustering helps identify topical relationships between pages.
Step 3: Measure Topical Link Distribution
Next, determine how many internal links come from within the same topic cluster versus outside the topic cluster.
For example:
Page:
examplehobbyshop.com/crafts/embroidery/intro-to-embroidery
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Total internal links: 100
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Links from pages in the “crafts” category: 60
Calculation:
60 ÷ 100 = 60%
A general guideline:
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75% or higher → strong topical reinforcement
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Below 75% → potential topical dilution
Evaluating Anchor Text Contribution to Topical Authority
Step 1: Extract Anchor Text
Remove repetitive elements such as header and footer links.
Then collect the anchor text (or image alt text) used in internal links pointing to each page.
Step 2: Categorize Anchor Text Relevance
Classify anchor text into three groups:
| Category | Description |
|---|---|
| Topically relevant | Clearly related to the destination page |
| Topically irrelevant | Not related to the page topic |
| Generic | Non-descriptive anchors like “click here” |
Example for an embroidery guide page:
Topically Relevant
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“get started with embroidery”
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“learn the tools needed for embroidery”
Topically Irrelevant
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“start a new hobby”
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“try something new”
Generic
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“click here”
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“next”
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“page 2”
If the page receives:
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30 relevant anchors
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20 irrelevant anchors
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50 generic anchors
Total links = 100
Topical relevance score:
30 ÷ 100 = 30%
This indicates weak anchor-text alignment, even if many links come from relevant pages.
Step 3: Evaluate Intent Consistency
Anchor text should also align with the intent of the page.
Common intent types include:
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Informational
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Commercial
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Transactional
If anchor text suggests mixed intent, it can confuse search engines.
Example:
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“Learn more about embroidery” → informational
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“Buy embroidery tools” → transactional
If both link to the same page, search engines may struggle to determine the page’s purpose.
Ideally, anchor text should show:
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High topical relevance
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Low intent variation
Final Thoughts
By analyzing internal links, you can better understand:
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The topical relevance of linking pages
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How anchor text supports topic and intent
When this analysis is applied across many URLs, patterns begin to emerge showing whether internal linking is strengthening or diluting topical authority.
Once weaker areas are identified, you can improve internal links by:
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Adjusting anchor text
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Linking from more relevant pages
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Aligning link intent with page purpose
These changes help reinforce a page’s authority as a reliable resource on its topic.