Most SEOs spend all their time chasing external links.
They completely ignore the link equity they already own.
Internal links — the links between pages on your own website — are one of the highest-ROI, lowest-cost SEO tasks you can do. They cost you nothing except time. The impact on rankings, crawlability, and user experience is immediate and significant.
An internal link is a hyperlink from one page on your domain to another page on the same domain.
Your homepage links to your services page. Your blog post links to a related guide. Your guide links to your contact page. All internal links.
From an SEO perspective, internal links do three critical things:
Google's PageRank flows through links. External links bring PageRank into your site. Internal links distribute that PageRank around your site.
Your homepage typically has the most external links pointing at it. If you have no internal links, all that PageRank stays on the homepage and barely touches your deeper pages.
When you build smart internal links from high-authority pages (your homepage, your most-linked blog posts) to pages you want to rank, you are channelling PageRank exactly where you want it.
This is link equity redistribution. It costs you nothing.
Googlebot follows links to discover pages. If a page has no internal links pointing at it, Google may not crawl it regularly — or at all.
Pages with no internal links are called orphan pages. From Google's perspective, if your own site does not link to a page, that page probably is not important.
An internal link audit almost always reveals orphan pages — often important ones that have been missed in site restructures or CMS migrations.
The anchor text of an internal link tells Google something about the page being linked to.
If 12 different pages on your site link to your "link building services" page using the anchor text "link building services," Google reads that as a signal that this page is about link building services.
This is a mild but real ranking signal. Over-optimising is not necessary or advisable. But deliberately using descriptive anchor text for your key pages reinforces their topical context.
People follow links. A well-placed internal link keeps a reader on your site longer, introduces them to more of your content, and guides them toward conversion points.
UX improvements from internal linking include:
Google notices engagement signals. Good internal linking contributes to them.
Before you build, understand what you have.
Screaming Frog is the best free tool for a detailed internal link audit.
What to look for:
Ahrefs also shows you which pages have the highest PageRank concentration internally — useful for identifying which pages to use as link sources.
If you do not have these tools, use Google Search Console:
Also use Google Search to check: site:yourdomain.com "topic keyword" to find pages on your site related to a topic, then check whether they link to your target page.
A silo structure is a way of organising your site into topical clusters. Pages in the same cluster link to each other heavily. Cross-cluster linking is controlled.
This reinforces topical relevance signals and helps Google understand your site's expertise areas.
Silo 1: Link building services
Silo 2: Link building education
Silo 3: Link building tactics
Silo 4: Link building by industry
Within each silo, pages link to each other freely. The hub page receives the most internal links from the spokes. External links pointing at any spoke page benefit the whole silo.
Anchor text in internal links matters. Not as much as external link anchor text, but it matters.
When you add an internal link, ask: if someone read this anchor text with no other context, would they know what the linked page is about?
If yes, you have good anchor text.
Orphan pages are pages on your site that no other page links to.
Google may still find them via your sitemap. But without internal links, they accumulate minimal PageRank and rank poorly.
Method 1: Screaming Frog + Google Search Console
Method 2: Ahrefs Site Audit Run a crawl, filter for pages with zero internal links in the Internal Pages report.
Method 3: GA4 + Screaming Frog comparison Export all pages with sessions from GA4. Compare against crawled URLs. Pages with sessions but no crawl inclusion are orphans.
For each orphan page:
There is no magic number. But here is a practical framework.
Homepage: Link to every main section of your site. 10–20 links is normal.
Pillar/hub pages: Link to all spoke pages in the silo, plus related hub pages. 10–15 links is reasonable.
Blog posts and guides: 3–7 internal links per article. Every post should link to at least one hub page and 2–3 related posts.
Service pages: Link to related service pages, relevant blog content, and your contact/conversion page. 5–10 links.
General rule: Add internal links where they genuinely help the reader. Never add links just to add links. A page with 40 forced internal links is not better than a page with 5 natural ones.
Your most-linked blog post may have significant PageRank. If it does not link to your main service pages, that equity is wasted.
Audit your top 10 most-linked pages. Are they linking to your key money pages? If not, fix it today.
Links in JavaScript menus are harder for Google to follow than links in standard HTML. Your main navigation should be in clean HTML.
Many CMS themes link the site logo to the homepage on every page. That is fine. But if the homepage is getting 90% of your internal link equity and your service pages are starved, you have a PageRank concentration problem.
When you publish a new guide or service page, you should immediately find 5 existing posts and add internal links to the new content. This is called reverse internal linking. It is consistently missed.
If you have restructured your URLs at some point, old internal links may point to redirects rather than final URLs. This dilutes PageRank (each redirect costs some equity). Fix all internal redirect links to point to the final URL.
Internal link building is ongoing. Every time you publish new content:
Build this into your content publishing workflow and your internal link equity compounds automatically.
Internal linking is the highest-leverage zero-cost SEO activity available to you. If your site has more than 50 pages and you have not done an internal link audit, do it this week.
For the full picture on how internal links fit into your broader SEO strategy, start with what is link building and link building strategies.
And if internal linking is already handled and you are ready to build external links, the link building techniques guide covers every external tactic worth knowing.