Internal links are votes you cast from within your own site — and unlike backlinks, you control them entirely. Every page you link to from a high-authority page receives a transfer of PageRank-equivalent value. Every internal link anchor text tells Google what the linked page is about. Every link you create (or fail to create) shapes the crawl paths Googlebot follows through your site.
Most sites under-optimize internal linking because it requires systematic auditing rather than one-time implementation. Internal links that worked for a 50-page site stop working for a 500-page site — the structure needs to scale.
Link Equity and the PageRank Model
PageRank (and Google’s modern equivalent) flows through links:
- A page with many inbound links has high authority
- When that page links to another page, it shares authority
- The more links on a page, the more diluted each individual link’s equity transfer
Practical implication: Your homepage and high-traffic evergreen content are your most authoritative pages. Links from these pages to target pages transfer more equity than links from thin, low-traffic pages. Map your link equity flow intentionally — where does authority concentrate on your site? Is it flowing toward the pages you most want to rank?
Hub-and-Spoke Architecture
The most effective internal linking structure for content-heavy sites:
Hub pages (also called pillar pages or cornerstone content) are comprehensive, authoritative pages covering a broad topic. They link to spoke pages on sub-topics. Spoke pages link back to the hub.
Example for a home improvement site:
- Hub: “Complete Guide to Kitchen Renovation”
- Spokes: “Kitchen Cabinet Costs,” “Countertop Material Comparison,” “Kitchen Layout Types”
- Each spoke links back to the hub, concentrating hub-level authority; hub links to each spoke, distributing authority downward
This structure signals to Google that the hub is the topical authority page for the broad topic, while spokes target long-tail subtopic queries.
Anchor Text Strategy
Internal link anchor text is a relevance signal. Google uses it to understand what the linked page is about — similar to backlink anchor text, but you control it.
Best practices:
- Use descriptive, keyword-informed anchor text: “our guide to technical SEO audits” rather than “click here” or “read more”
- Vary anchor text naturally across multiple links to the same page — exact-match repetition looks unnatural
- Match anchor text to the target page’s primary keyword or close variants
What to avoid:
- Generic anchor text (“here,” “this post,” “learn more”) wastes the relevance signal
- Over-optimized exact-match anchor text on every internal link to a page looks manipulative
- Anchor text that doesn’t describe the linked content confuses both users and Google
Orphan Page Identification and Linking
Orphan pages have no internal links pointing to them — they’re accessible only via sitemap or direct URL. Google crawls them infrequently because there are no links to follow to reach them.
Finding orphan pages:
- Export all pages from your sitemap
- Compare with your crawl tool’s “internal links” report
- Pages appearing in the sitemap but not in any internal links report are orphans
Priority orphan pages for internal linking:
- High-value pages with external backlinks but no internal links (they earn authority but don’t receive equity distribution)
- New pages (need internal links immediately for discovery and indexing)
- Revenue-critical pages with no natural linking path
Crawl Depth and Link Depth
Link depth is the number of clicks from the homepage to reach a page. Pages buried 5+ clicks deep are crawled infrequently and rank harder than pages 2-3 clicks from the homepage.
For large sites, audit the click depth distribution:
- Important pages should be within 3 clicks of the homepage
- Reduce depth for high-priority pages by adding links from hub pages, the homepage, or high-traffic landing pages
Flat architecture principle: For link equity distribution, flatter is better — more pages accessible in fewer clicks means more regular crawling and more equity distribution.
Internal Linking Audit Process
Systematic internal linking audit:
- Crawl your site (Screaming Frog, Sitebulb, or Ahrefs Site Audit) to get every internal link
- Map link equity — identify pages with most inbound internal links vs. pages with least
- Check top-ranked pages for outbound internal links — are high-authority pages actively linking to priority target pages?
- Find orphan pages — as described above
- Audit anchor text distribution — are you using descriptive, varied anchor text?
- Create linking opportunities — for each underpowered target page, identify 5-10 existing pages that could naturally add a link
Repeat quarterly. As new content is published, it needs links; as old content is archived, broken links accumulate.