Internal linking is one of the most powerful — and most neglected — SEO tactics available to any site owner. Unlike backlinks, you have complete control over your internal link structure. Used strategically, it distributes authority from your high-traffic pages to the pages you most want to rank.
Why Internal Links Matter
Every page on your site has a certain amount of PageRank — Google's measure of a page's authority. Internal links are the pipes through which that PageRank flows. A page that receives many internal links accumulates more authority and tends to rank better.
Beyond authority distribution, internal links also: - Help Google discover and crawl new or updated pages faster - Establish topical relationships between related content - Keep users engaged by directing them to relevant content - Reduce orphan pages (pages with no inbound links that may never be discovered or ranked)
The Pillar Page and Cluster Model
The most effective internal linking structure is the pillar and cluster model. A pillar page covers a broad topic comprehensively. Cluster pages cover specific subtopics within that broader topic in depth. All cluster pages link back to the pillar, and the pillar links out to all cluster pages.
This structure signals to Google that you have comprehensive, authoritative coverage of a topic — a key signal for ranking well on competitive queries.
Finding and Fixing Orphan Pages
An orphan page is a page with no internal links pointing to it. Google may never discover it (or may discover it only slowly via sitemap), and even if it does, it will assign very low authority to it.
Use a site crawler to identify all orphan pages on your site. For each one, decide: 1. Does this page need to exist? If not, redirect it to a relevant page. 2. If it should exist, which existing pages should link to it?
Anchor Text Best Practices
The anchor text of an internal link tells Google what the destination page is about. Use descriptive, keyword-relevant anchor text rather than generic "click here" or "read more" links.
However, don't over-optimise. Using the exact same keyword-rich anchor text for every internal link to a page can look unnatural and may be counter-productive. Vary your anchor text while keeping it descriptive.
How Many Internal Links Per Page?
There's no hard limit, but a reasonable guideline is to include links that genuinely help the user navigate to related content. Don't stuff pages with internal links just to pass authority — focus on links that are contextually relevant and useful.
For important pages you want to rank, aim for 5-15 contextual internal links from relevant pages across your site.
Sidebar and Navigation Links
Navigation links (header, footer, sidebar) do pass PageRank, but contextual links within body content are generally considered more valuable. This is because contextual links have surrounding text that provides context about the relationship between the pages.
Use your navigation to link to your most important hub pages. Use contextual body links to create the detailed cluster structure that shows topical depth.
After a Site Migration
Internal link audits are especially important after a site migration. It's common for migrations to break hundreds of internal links, creating 404s that waste crawl budget and leak authority. Always run a full internal link audit after any significant site restructure or URL changes.
Practical Steps to Improve Your Internal Linking
1. Run an internal links audit to identify orphan pages and broken internal links 2. Map your site's most important pages and check how many internal links they receive 3. Identify your highest-traffic pages and add internal links from them to the pages you want to rank 4. Build your pillar and cluster structure for your main topic areas 5. Check that new content always links to relevant existing content
Consistent internal linking is not a one-time task. Make it part of your content publishing workflow — every new piece of content should link to and receive links from existing relevant pages.