Internal Linking and Site Architecture: How to Distribute Authority

Internal links are the connections between pages on the same website, and site architecture is how those pages are grouped and linked. Through internal links, Google discovers new pages, understands what each is about, and infers what matters most; readers use them to move from one page to the next. A clear structure and descriptive anchor text are among the cheapest SEO improvements you can make.

Unlike links you earn from other sites, which you do not fully control, internal links are entirely in your hands. That is why they belong in any serious on-page SEO plan and why we check them first when a site stalls. Below you will find the architecture model, the link types, the rules for anchors, a six-step audit, and the limits.

What do internal links do for SEO and for users?

An internal link serves four functions, worth keeping separate:

1. Discovery. Google finds new pages by following links. A page that nothing links to is hard to find, even if it is in your sitemap.
2. Context. The link text (anchor) and the words around it tell the search engine what the target page is about.
3. Relative importance. Pages that many internal links point to, especially from important pages, look more important in the site's structure.
4. Navigation. The user finds the next step: the product, the comparison, the contact page.

In simple terms, part of a page's “authority” flows through its links to other pages. You cannot measure exactly how much, and Google publishes no formulas; but the logic is enough for decisions. A strong pillar page that links to commercial pages helps them, while an isolated commercial page receives nothing.

How does Google use links?

Google's documentation on links makes a few verifiable points:

• Google follows links built as <a> elements with an href attribute. Elements that are not of this type (for example, a <span> with onclick, or an <a> without href) may not be followed.
• Anchor text (the visible text of the link) should be descriptive, reasonably concise, and relevant to the target page.
• Internal links help discover pages and provide context; a sitemap does not replace them, it only helps.

<!-- Crawlable -->
<a href="/guides/keyword-cannibalization">keyword cannibalization</a>

<!-- Problematic: not a standard link -->
<span onclick="location.href='/guides/keyword-cannibalization'">keyword cannibalization</span>

If your menu or in-content links are generated only by JavaScript after load, check in Search Console's URL Inspection whether they appear in the rendered HTML; details are in the guide to JavaScript SEO.

What does a healthy site architecture look like?

Architecture is a hierarchy you can draw on a sheet of paper. The most common model is “hub and spoke”: pillar pages for big topics, surrounded by supporting pages for subtopics, all linked to each other.

Home page
├── Category A (pillar)
│   ├── Subcategory A1
│   │   ├── Page / product A1-1
│   │   └── Page / product A1-2
│   └── Supporting article about A (blog)
├── Category B (pillar)
│   └── ...
├── Blog
│   └── Articles, linked to pillars and to each other
└── Utility pages (contact, about us)

Principles that work for almost any site:

• Logical hierarchy. Every page has a clear parent and can be reached from the home page in steps that make sense.
• Shallow depth. Important pages 3–4 clicks from the home page. This is a practical benchmark, not an official rule. Google's John Mueller has said in the past that click distance from the home page matters more than the number of directories in the URL; that comes from informal statements, not from Google's documentation, which gives no ideal click depth.
• Links in both directions. The pillar links to its supporting pages, and they link back to the pillar and, where it makes sense, to each other.
• A coherent URL structure that mirrors the hierarchy, although this is not mandatory.
• No islands. Every indexable page gets at least one internal link from relevant pages.

Choosing pillars starts with keyword research: big topics become pillars, and questions and variants become supporting pages. If two pages end up competing for the same search, the problem is not links but keyword cannibalization.

What types of internal links are there?

Not all internal links play the same role. This table helps you decide what goes where:

Breadcrumbs can be marked up with BreadcrumbList structured data so Google understands the hierarchy; see how in the guide to Schema.org structured data:

{
  "@context": "https://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [
    {"@type": "ListItem", "position": 1, "name": "Home", "item": "https://example.com/"},
    {"@type": "ListItem", "position": 2, "name": "Blog", "item": "https://example.com/blog"},
    {"@type": "ListItem", "position": 3, "name": "Internal linking"}
  ]
}

How do you choose anchor text for an internal link?

Anchor text is the clickable text. For internal links you have more freedom than for external ones, but the same principles apply: describe the destination, be natural, and vary.

Practical rules:

1. Put the destination's topic in the anchor, not a whole sentence.
2. Be consistent. If you link to the same page from ten places, vary the anchor naturally but keep the meaning.
3. Do not use the exact same anchor for different pages. Otherwise it becomes unclear which page the anchor describes, for Google and for readers.
4. Do not over-optimize. Anchors should sound like ordinary language. For the balance of anchors on links from other sites, see the article on anchor text and a natural link profile.
5. Link at the first useful mention, not at every mention of the term.

How to add contextual links, step by step

1. List the pages you want to push: commercial pages, pillars, and the articles that bring in customers.
2. Search your own site for mentions of their topics (search in your CMS, or site:yourdomain.com "term" in Google). Every unlinked mention is an opportunity.
3. Add the link where the reader really gains something. If a paragraph says “see the costs below,” the link should lead to the costs.
4. Link in the opposite direction too. The supporting article points to the commercial page; the commercial page points to a few articles that answer objections.
5. Add links when you update. With every new publication, find 3–5 older articles where the new material fits; see also updating old articles.
6. Keep a record of what you linked, in a simple page–page–anchor sheet.

An example in practice: an informational article on a topic related to your service is read by people who are not buying yet. A link to the service page, placed at the right moment, is not an aggressive ad but a natural next step. That is how we linked the pages of this blog: guides point to the service they support and to related articles.

How to audit internal links in six steps

An audit shows where authority gets lost. You need a crawler (any program that walks through your site like a robot, free or paid) and Google Search Console.

1. Run a full crawl of the site; export the list of pages with the number of internal links received and click depth.
2. Look for orphan pages: pages with zero links received. Compare the crawl list with the sitemap and with pages that get traffic.
3. Look for buried pages: important pages at depth 5 or more.
4. Check commercial pages: how many internal links do they receive compared with minor articles? If the service page has 3 and an old article has 80, you have a proportion problem.
5. Check broken and redirected links: internal links to 404 errors or redirect chains waste signals; update them to point straight at the final address. See 301 and 302 redirects.
6. Compare with Search Console. The Links report shows the pages with the most internal links. If a page you want to push is not near the top, you have found your first fix.

Decision table based on the audit:

Internal links in online stores

Stores have a specific problem: a large number of pages and filters that can generate thousands of URLs. Basic rules:

• main links go to categories and subcategories, not to every filter combination;
• important products get links from categories, from guides, and from “how to choose” pages;
• category pages link to subcategories and to a few products or buying guides;
• filters that generate pages with no search value should not multiply in the index; when needed, use a canonical tag or limit crawler access.

More on categories in the guide to optimizing category pages.

Common mistakes

• Orphan pages: pages with no internal link at all.
• Links only in the menu, with no contextual links in the text.
• Generic anchors (“click here,” “read more”).
• The same anchor for different pages.
• Too many footer links, on every page, with keyword anchors, which looks like manipulation.
• Links to redirected or 404 pages.
• Links that rely only on JavaScript, which may not be followed.
• nofollow on ordinary internal links.
• Architecture that is too flat or too deep: every page in one place, or important pages buried five levels down.
• Unmaintained links, added once and forgotten: as the site grows, the structure degrades.
• Links into cannibalization, meaning toward several pages for the same search.

When this does not apply, and the limits

• Internal links do not make up for weak content; a page linked from everywhere stays weak if it does not answer the search.
• You cannot calculate the authority passed “exactly.” Google publishes no formulas, and any exact figure is an estimate.
• On a very small site (5–10 pages) the architecture is simple; there is no point building complex clusters.
• Too many links on a page reduce readability; usefulness to the reader outranks “pushing” authority.
• An internal link does not replace a quality external link; for authority from outside your site, see link building.
• Results appear over weeks or months, after Google recrawls the pages; we do not promise rankings.

Conclusion and next steps

Internal links and site architecture are a maintenance project, not a one-off action. If the hierarchy is clear, anchors are descriptive, and important pages are a few clicks away, you already have a better foundation than many sites.

A plan for the next two weeks:

1. Run a crawl and export internal links received per page.
2. Identify orphan pages and commercial pages with few links.
3. Add 20–30 contextual links to priority pages, with descriptive anchors.
4. Fix broken links and redirect chains.
5. Repeat the quick audit every quarter or after publishing a large batch of pages.

If your site has hundreds of pages or a structure inherited from several redesigns, on-page SEO typically includes an architecture map and an interlinking plan by page type. To see where to start, open Google Search Console and compare the pages with the most impressions against the most internally linked ones.