Internal Linking: The Cheapest SEO Win Most Sites Ignore

Nearly every SEO improvement requires something you have to buy: time, content, a developer, or someone else’s willingness to link to you. Internal linking requires none of those. You already own every page involved. You can do a meaningful pass on a small site in an afternoon, and the effects show up within a crawl cycle or two.

It stays neglected because it is unglamorous and because nobody sells it as a package.

What internal links actually do

Three separate jobs, and it helps to keep them apart.

They tell Google a page exists. Crawlers follow links. A page nothing links to is discovered only through a sitemap, which is a weaker signal and treated accordingly.

They pass authority around your site. Whatever standing your site has accumulated is not distributed evenly. It concentrates on pages other sites link to — usually the homepage — and flows outward through your links. Pages far from that concentration get very little.

They describe the destination. This is the part with the most leverage and the least attention. The words inside the link tell Google what the page you are pointing at is about.

Anchor text is the whole point

Compare two versions of the same sentence.

To find out more about our SEO work, click here.

We cover this in more detail on our SEO services page.

Both send a visitor to the same place. Only the second tells Google anything. “Click here”, “read more”, “learn more” and a bare URL are all wasted signals, and they are worse for screen reader users too.

Rules that hold up:

• Use descriptive phrases that match what the destination page is about.
• Vary the wording. Twenty links reading exactly “SEO services London” looks manufactured because it is.
• Do not use the same anchor text to point at two different pages. That is you telling Google which of your own pages to be confused about.
• Put links inside body copy where possible. A link in a sentence carries more weight than the same link in a sidebar.

Click depth, and why three is the number people use

Click depth is how many clicks it takes to reach a page from the homepage. There is no official threshold, but the working convention is that anything reachable in three clicks or fewer gets crawled reliably, and pages sitting at five or six get visited rarely.

Map it for your own site. Start at the homepage, click through to a service page, then to whatever sits beneath it. If your most commercially valuable page is four clicks deep behind a blog archive and a category listing, that is a structural problem, and it is usually fixed by linking to it from the homepage or the main navigation rather than by restructuring the whole site.

Find your orphans

An orphaned page has no internal links pointing to it at all. Every site that has been running for a few years has some.

Two ways to find them without buying anything. Screaming Frog’s free tier crawls up to 500 URLs; connect it to your sitemap and it will flag URLs present in the sitemap but not reachable by crawling. Alternatively, open the Links report in Search Console, look at “Internally linking pages”, and compare that list against your sitemap. Anything in the sitemap and absent from the links report needs attention.

Then decide honestly per page: link to it properly, or delete it. A page nothing links to is usually a page nobody needed, and pruning is a legitimate answer.

Link from your strongest pages, not your newest

The instinct is to add links to whatever you just published. It is backwards.

Open the Performance report in Search Console, sort your pages by clicks, and take the top ten. Those are the pages with the most accumulated standing and the most human traffic. Adding a relevant link from one of those to a page you want to promote does more than ten links from pages nobody visits.

This is the highest-value half hour in the whole exercise. Older posts that still get traffic are almost always missing links to newer, more commercially relevant pages, purely because they were written first.

Navigation and footers count for less

Links that appear in the same place on every page — main nav, footer, sidebar — are recognised as site-wide furniture and weighted accordingly. They are still worth having, because they are how people move around, but they are not where you win anything.

Two things to avoid. Do not stuff the footer with sixty links to every location and service you have ever considered; it dilutes rather than concentrates. And do not rely on a mega-menu to do the job of contextual links inside your content, because it does not.

One caveat on mechanics: if your navigation is built entirely in JavaScript and only appears after a click, Google may not follow it at all. A quick check is to view the rendered HTML in Search Console’s URL Inspection tool and confirm the links are present.

A routine that keeps it working

Twenty minutes, once a month:

1. Publish or update a page.
2. Search your own site for the topic — site:yourdomain.com "the topic" in Google — to find the three or four existing pages that mention it.
3. Add a contextual link from each of those to the new page, with anchor text that describes it.
4. Add one or two links from the new page out to relevant existing pages, so it contributes rather than only receiving.

That is the entire discipline. The reason it works is that most sites never do step two, so every new page starts isolated and has to earn attention from nothing.

What it will not do

Internal linking redistributes what your site already has. It does not manufacture authority. If no external site has ever linked to you, moving your own links around changes the relative standing of your pages but not the absolute level of any of them.

It also cannot rescue a page that does not deserve to rank. If the destination is thin, or duplicates another page, or answers a question nobody asks, pointing more links at it produces a better-connected page that still does not rank.

Used properly, it is the thing you do to make sure the work you have already paid for is not sitting somewhere Google barely visits. If you want that assessed across a whole site, it forms part of an SEO audit.