Internal linking is one of the most underused levers in SEO. It’s entirely within your control, it costs nothing to implement, and done well it can meaningfully improve the rankings of your most important pages.
Most websites don’t have an internal linking strategy — they have internal links that appeared accidentally while someone was writing content. Building a deliberate strategy, even a simple one, separates sites that rank from sites that struggle to move the needle despite publishing good content.
Why Internal Links Matter for SEO
Internal links serve three overlapping purposes in SEO:
1. Crawlability and indexation. Search engine crawlers discover pages by following links. A page that has no internal links pointing to it — an “orphan page” — may never be found by Google even if it’s technically indexed. Internal links ensure your pages are discoverable.
2. Link equity distribution. When an external site links to your homepage, that link passes authority. Your homepage can then distribute some of that authority to other pages through internal links. This is sometimes called “PageRank sculpting” or link equity distribution, and it’s a real and meaningful mechanism for improving rankings across your site.
3. Topical relevance signals. When you link between related pages, you signal to Google that these pages are related topics. This helps build “topical authority” — the sense that your site comprehensively covers a subject area, which Google increasingly rewards.
The Structure: Pillar Pages and Topic Clusters
The most effective internal linking structure is organized around pillar pages and topic clusters.
Pillar page: a comprehensive, authoritative overview of a broad topic. It covers the major aspects of the subject at a high level and links out to more detailed cluster pages.
Example: “Complete Guide to Email Marketing” is a pillar page. It’s broad, comprehensive, and links to more specific pages in the cluster.
Cluster pages: deeper articles on specific subtopics within the pillar’s topic area. Each cluster page links back to the pillar page.
Example cluster pages for the email marketing pillar: “How to Write Email Subject Lines,” “Email List Building Strategies,” “Email Marketing Automation Basics.”
The linking structure creates a hub-and-spoke model:
- Pillar links out to all cluster pages
- All cluster pages link back to the pillar
- Cluster pages can link to each other where relevant
Why this works:
- The pillar page consolidates link equity from all the cluster pages pointing back to it
- Google sees a comprehensive topical structure, which signals expertise and authority
- Users can navigate between related content naturally
Anchor Text Strategy
Anchor text is the clickable text in a link. It’s a signal to Google about what the linked page is about.
Types of anchor text:
Exact match: the link text is exactly the target keyword. “Read our [email marketing guide]” with the bracket text matching the target keyword for the linked page. Powerful but can look unnatural if overused.
Partial match: the link text contains part of the target keyword phrase. “Here’s everything you need to know about [writing email subject lines].” Natural and effective.
Branded: linking to a specific tool, product, or brand by name. “[Mailchimp’s automation features] make this easier.” Good for brand recognition, less useful for keyword targeting.
Generic: “click here,” “read more,” “learn more.” Provides minimal SEO value. Avoid where possible.
Best practice: use descriptive, partial-match or exact-match anchor text where it reads naturally. Never use “click here.” Don’t over-optimize by using the same exact anchor text for every link to the same page — variety is natural and safer.
How Many Internal Links Per Page?
There’s no hard rule, but practical guidelines:
- A 1,000-word post: 2–4 internal links feels natural
- A 2,000-word guide: 4–8 internal links
- A pillar page (3,000+ words): 8–15 internal links to cluster pages
Avoid linking for the sake of linking. Every internal link should be to content that’s genuinely relevant and useful to the reader at that point in the article. Forced links to unrelated pages dilute your anchor text signals and confuse readers.
Google’s guidance is simply that internal links should be useful to users — the SEO benefit is a byproduct of well-structured navigation.
Building Internal Links Into Your Workflow
The time to add internal links is when you’re publishing new content — and retroactively, when updating old content.
When publishing a new article:
- Identify 3–5 older articles that are relevant to the new one
- Add links from the new article to those older pages
- Go to the older pages and add a link to the new article from a relevant section
On a regular basis: 4. Identify orphan pages (pages with no inbound internal links) using your analytics tool or a site crawler like Screaming Frog 5. Add internal links to those pages from relevant existing content
When updating existing content: 6. Look for opportunities to link to newer content you’ve published since the original piece was written
This retroactive linking is where most of the easy wins are. Many sites have strong existing pages that rank for related keywords — a few minutes adding internal links between them can improve rankings without publishing a single new piece.
Link Equity: How Authority Flows Through Internal Links
Every page on your site has some amount of “authority” or “PageRank” based on the external links pointing to it. That authority flows through internal links.
The practical implication: your most linked-to pages (usually the homepage and a few popular articles) have the most authority to pass. Linking from those high-authority pages to pages you want to rank better is one of the most effective internal linking tactics.
How to find your high-authority pages:
- Google Search Console Performance report: sort by clicks or impressions to find your highest-traffic pages
- Ahrefs Site Explorer: shows URL Rating (UR) for each page
- Your analytics: highest organic traffic pages likely have strong authority
Once you know which pages have authority, ensure they link to the content you most want to rank — especially to your pillar pages.
Technical Considerations
Follow vs. nofollow: internal links should almost always be “follow” (the default). Nofollow tells Google not to pass equity through the link — the opposite of what you want for your own internal structure.
Link depth: pages should be reachable from the homepage in as few clicks as possible. Pages buried 4 or 5 clicks deep rarely rank well. A well-structured site keeps important content within 2–3 clicks of the homepage.
Broken internal links: these pass no equity and create a bad user experience. Audit for broken links periodically using tools like Screaming Frog or the free broken link checker in Ahrefs Webmaster Tools.
Tools for Internal Linking
Screaming Frog (free up to 500 URLs): crawls your site and maps internal link structure. Shows orphan pages, link counts per page, and anchor text.
Ahrefs Webmaster Tools (free): identifies internal link opportunities and orphan pages.
Link Whisper (WordPress plugin, paid): suggests internal links as you write in the WordPress editor. Saves significant time for active content publishers.
Yoast SEO Premium: includes an internal link suggestion feature while editing.
Putting It Together
A basic internal linking strategy for a content-focused site:
- Build content around pillar pages and cluster pages
- Ensure every cluster page links to the pillar
- Ensure the pillar links to all cluster pages
- Use descriptive, partial-match anchor text
- Add 2–4 internal links to every new piece of content you publish
- Monthly: check for orphan pages and add links to them
- Quarterly: review your highest-traffic pages and ensure they link to important content you want to rank better
For the on-page optimization elements that work alongside internal linking, see our on-page SEO guide for content writers. And for the broader content writing process that makes these links valuable, our guide to writing SEO content that ranks covers the complete picture.