Internal Linking

What is Internal Linking?

Internal linking refers to all links that point from one page of a website to another page of the same website. Unlike external links (which point to other websites), internal links remain within the same domain. They form the framework through which visitors and search engines navigate a website.

You can think of a website like a road network: each page is a location, and the internal links are the roads connecting these locations. If there is no road to a location, it is practically unreachable.

Why is Internal Linking Important for SEO?

• Crawling and Indexing: Search engines like Google follow internal links to discover and index new pages. A page that has no internal links pointing to it is often not found at all.
• Distribution of Link Equity: Internal links distribute so-called link equity (also known as "link juice") within the website. Pages that are linked to frequently tend to be considered more important by Google.
• Thematic Connections: Internal links show Google which content is thematically related. This helps the search engine understand the thematic focus of a website.
• Improved User Guidance: Well-placed links guide visitors to further content, increase dwell time, and reduce the bounce rate.

Orphaned Pages: A Frequently Overlooked Problem

An orphaned page is a page that has no internal links pointing to it. Such pages often occur on websites that have grown over the years, for example when old posts are no longer integrated. For search engines, they are difficult to find and are often not indexed, even if they contain valuable content. Regularly reviewing your site structure can uncover such gaps. Tools like Google Search Console or Screaming Frog SEO Spider can help with this.

The Right Anchor Text

The anchor text is the visible, clickable text of a link. It should be descriptive and indicate what users can expect on the target page. Instead of "click here," a link text like "Guide to Conversion Optimization" is much better because it tells both users and Google what the target page is about. It is important to use natural variations and not always use the exact same keyword.

Strengthening Important Pages in a Targeted Way

Not every page is equally important. Central pages such as key service pages, sales pages, or comprehensive guides should be linked to more frequently and prominently than secondary content. A proven concept for this is the Topic Cluster Structure:

• A central Pillar Page covers a main topic comprehensively (for example, "Search Engine Optimization").
• Several Cluster Pages cover subtopics in detail (for example, "Keyword Research," "Backlinks," "Technical SEO").
• All cluster pages link to the pillar page and vice versa.

This structure signals to Google the thematic depth of a website and strengthens the visibility of all involved pages.

Aim for a Flat Hierarchy

Important content should be reachable from the homepage with as few clicks as possible, ideally within three clicks. Pages that are "buried" deep in the structure are reached less frequently by both users and search engines. A flat, clearly organized structure ensures that no content remains invisible.

Technical Notes

• No nofollow on internal links: Contrary to previous assumptions, there is no advantage to using rel="nofollow" on internal links to pages like the imprint or privacy policy. Google explicitly does not recommend this, as link equity is lost rather than being redirected in a targeted way. Internal links should be linked normally.
• Crawl Budget: For large websites with thousands of pages, a clear link structure helps Google focus its limited crawling resources on the important pages. For smaller websites, this point is hardly relevant.
• Avoid Broken Links: Internal links that lead to nowhere (404 errors) harm the user experience and should be checked and corrected regularly.

Conclusion

Internal linking is one of the most effective and easiest-to-implement SEO tools, as you have full control over it, unlike with external backlinks. By sensibly connecting content, strengthening important pages in a targeted way, and paying attention to descriptive anchor texts, you improve both findability on Google and navigation for your visitors. Regularly reviewing the link structure is worthwhile for websites of any size.