Internal links are hyperlinks that point from one page on your domain to another page on the same domain. They serve three critical SEO functions: distributing PageRank across your site, establishing topical relevance through anchor text, and enabling search engine crawlers to discover and index your content.
How Internal Links Distribute Authority
PageRank flows through links. A page with high authority (many backlinks, strong signals) passes a portion of that authority to every page it links to. The more internal links a page receives, the more authority it accumulates. Pages buried deep in your site with few internal links receive minimal authority and rank poorly.
This is why homepage links are so valuable. The homepage typically has the most external backlinks, so any page linked from the homepage receives a direct share of that concentrated authority.
Topic Clusters and Hub Pages
The most effective internal linking strategy organizes content into topic clusters:
- Pillar page (hub) - A comprehensive overview of a broad topic, linking to all related subtopics.
- Cluster pages (spokes) - Detailed articles on specific subtopics, each linking back to the pillar page and to related cluster pages.
[Pillar: WordPress Security Guide]
├── [Cluster: WordPress Login Security]
├── [Cluster: WordPress Plugin Vulnerabilities]
├── [Cluster: WordPress Backup Strategy]
└── [Cluster: WordPress Malware Removal]
This structure tells Google that your site has comprehensive coverage of the topic, boosting the entire cluster's ranking potential.
Anchor Text Best Practices
The clickable text of an internal link (anchor text) signals to Google what the destination page is about. Unlike external links, where varied anchor text is important to avoid manipulation signals, internal links benefit from descriptive, keyword-rich anchor text.
<!-- Good: descriptive anchor text -->
<a href="/guides/wordpress-security">WordPress security best practices</a>
<!-- Bad: generic anchor text -->
<a href="/guides/wordpress-security">click here</a>
<a href="/guides/wordpress-security">read more</a>
<a href="/guides/wordpress-security">this article</a>
Use natural, readable anchor text that includes the target page's primary keyword. Avoid using the exact same anchor text for every link to the same page -- vary it slightly for readability.
Identifying Orphan Pages
Orphan pages have no internal links pointing to them, making them invisible to crawlers that rely on following links. These pages rarely get indexed and almost never rank.
Detection method: Compare the list of all URLs in your sitemap against the list of URLs discovered during a full site crawl. URLs that appear in the sitemap but not in the crawl are orphans.
Fix: Add contextual internal links from relevant existing pages. Every page on your site should be reachable within 3 clicks from the homepage.
Link Placement and Value
Not all internal links carry equal weight:
- In-content links (within the body text) carry the most SEO value because they are contextually relevant.
- Navigation links (header, footer, sidebar) pass authority but provide less topical context.
- Footer links carry the least weight. Avoid stuffing hundreds of links into the footer.
Place your most important internal links within the main body content of your pages, near relevant text that supports the linked page's topic.
Audit Process
- Crawl your site and export the internal link report. Screaming Frog's "Internal" tab shows inlinks and outlinks for every URL.
- Identify pages with fewer than 3 internal links pointing to them. These are under-linked and likely underperforming.
- Find orphan pages by comparing crawled URLs against sitemap URLs.
- Review anchor text distribution to ensure descriptive text is used instead of generic phrases.
- Check for excessive links - pages with more than 100-150 internal links dilute the authority passed through each link.
- Map your topic clusters to verify each pillar page links to all its cluster pages and vice versa.
Common Mistakes
- Linking to the same page multiple times in one article. Only the first link to a URL on a given page passes anchor text signals. Additional links to the same URL are largely ignored.
- Nofollow on internal links. Do not use
rel="nofollow"on internal links. It wastes the PageRank that link would have passed. - Broken internal links. A broken internal link is both a crawlability issue and a lost authority signal. Fix immediately.