What Are Internal Links and Why Do They Matter for SEO?
An internal link is any hyperlink that points from one page on your website to another page on the same website. When you link from your homepage to a blog post, or from a blog post to a tool, that is an internal link.
Internal links matter for SEO for three reasons:
- Crawlability: Google's crawlers follow links to discover new pages. If a page has no internal links pointing to it, Google may never find it — no matter how good the content is.
- PageRank distribution: Google passes authority (PageRank) through links. Pages that receive more internal links from authoritative pages rank better.
- User navigation: Good internal links keep users on your site longer, reducing bounce rate and increasing engagement signals that Google uses as indirect ranking indicators.
The Pillar-Cluster Model
The most effective internal linking strategy organises your content into topic clusters. Each cluster has:
- One pillar page — a comprehensive guide covering the broad topic (e.g. "Complete Guide to On-Page SEO")
- Multiple cluster pages — specific posts that dive deep into subtopics (e.g. "How to Write Meta Tags", "What Is Keyword Density", "URL Structure for SEO")
The pillar page links to every cluster page. Each cluster page links back to the pillar page. Cluster pages also link to each other where relevant. This creates a web of topically related content that signals to Google that you are an authority on the subject.
How Many Internal Links Per Page?
There is no hard limit, but Google's general guidance is to keep links "reasonable". For most blog posts, 3 to 7 internal links per 1,000 words is a practical range. More than that can start to look spammy. Fewer than that is a missed opportunity to pass PageRank and guide users.
Every piece of content you publish should link to at least 2–3 other pages on your site before it goes live.
Use Descriptive Anchor Text
Anchor text is the clickable text of a link. It is one of the strongest signals Google uses to understand what the linked page is about.
Wrong: Click here to check your keyword density.
Right: Use our free keyword density checker to analyse your content.
Vary your anchor text naturally — do not use the exact same phrase every time you link to the same page. Google can interpret this as over-optimization.
Link From High-Authority Pages
Not all internal links carry equal weight. A link from your homepage passes more authority than a link from a newly published blog post. When you publish a new page you want to rank, find your highest-traffic existing pages and add a relevant internal link from them to the new page. This gives your new content a faster ranking boost.
Fix Orphan Pages
An orphan page is a page with no internal links pointing to it. Google can still index it if it is in your sitemap, but it will receive no PageRank from your site and will rank poorly. To find orphan pages:
- Export all pages from Google Search Console
- Crawl your site with a tool like Screaming Frog (free up to 500 URLs)
- Compare the lists — pages in GSC but not found by the crawler are likely orphans
- Add relevant internal links to them from existing content
Internal Links vs External Links
Internal links pass authority within your site. External links (linking to other websites) can improve your content's credibility and help users, but they pass authority away from your site. Use external links to authoritative sources where they genuinely help the reader, but prioritise keeping users on your site by linking internally whenever relevant content exists.
Practical Internal Linking Workflow
Follow this process every time you publish new content:
- Write the new post and identify 3–5 relevant pages already on your site
- Add internal links to those pages within the body of your new post using descriptive anchor text
- Go to your existing high-traffic posts and add a link back to the new post where relevant
- Check that your new post is linked from at least one category or index page so it is not an orphan
This process takes 10 minutes per post and compounds over time as your site grows.
Internal Linking and Content Quality Work Together
Internal links are most effective when the content they point to is genuinely high quality. Use our free Readability Checker to ensure your linked pages score well on clarity, and our Keyword Density Checker to confirm the target page is properly optimized for its keyword before you send PageRank its way.
Building a strong internal link structure takes a few months of consistent effort, but it is one of the few SEO tactics that is entirely within your control and costs nothing but time.