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Internal Linking

Internal Linking

Contents

Internal links deliver PageRank and relevancy to target pages and are vital to internal website navigation, the user experience and also to demonstrate what the most important pages on a website are.

Improper use of internal linking can result in an algorithmic penalty from Google. At best poor internal linking means that a site will not benefit from the advantages of optimised internal links and may not be crawled properly.

Internal linking is not difficult to understand or get right, but there is some nuance to it that makes it well worth understanding properly.
There are several types of ‘link’ in general:

We look at just internal links in this article but you can click either of the links above to learn more about the other types of links. This article is part of a series on content, for more articles relevant to this topic, please follow links below:

Why is it important?

Internal links provide five primary functions on a website, which are:

1. Website navigation

Probably most obvious are how internal links facilitate website navigation... Unless a website has just one small page, internal linking is required to provide the mechanism for users to move between pages. All website navigation relies on this to work; therefore, internal links are one of the most prevalent components throughout a website.

2. Crawlability

Links also assist robots or crawlers in crawling your website, allowing them to identify the location of all your web pages. Hence website navigation should address both the need of the human and machine.

3. Distributing PageRank (Page Authority)

Each link on a page allows PageRank to flow through it to the page being linked to, thus website authority is disseminated through its links to its pages.

Page authority (or PageRank) that flows through each link, is dived by the number of links on a page. So, if a page has 100 links, then each individual link passes on 1% of the available page authority. Or, if a page has 1,000 links, then each individual link passes 0.1% of the available page authority.

The reason why we state ‘available page authority’, is because if a page had only one link on it, this will be able to pass on between 85% to 90% of the PageRank. Meaning that the upper limit to how much PageRank can flow from one page to another is capped under 100%.

Hence if a page has 100 links, each link will pass on between 0.085% and 0.09% of the actual PageRank.

This is why internal linking strategies are so important, because the links act like valves and pipes distributing authority to where it is required.

4. Distributing Relevance

In the similar way to how authority flows through a link, so does relevance. The difference is that there is not finite amount of relevance that can pass through a link. Instead of a volume of relevance, it is contextual and limited to what text (or Alt tag in images) is being used.

Using relevant anchor text (described later in this article) can assist in delivering relevance (to a keyword) to a target page. This is done by optimising anchor text to target keywords.

5. Helps to Describe Site Structure & Hierarchy

If, for the sake of simplicity, we consider a website with 14 pages we can construct some scenarios to describe how structure and hierarchy are helped to be defined by different internal linking configurations

Flat Structure: If every page of this 14 page site were linked to an equal number of times, this would indicate to Google that all of the pages are roughly of equal importance.

Pyramid: If the site were structured such that it had 3 category pages, each with 3 sub-category pages, and a home page... each set of pages had the following ratio of links:

  • Home Page 33% (33% per page)
  • Category Pages 33% (11% per page)
  • Sub Category Pages 34% (3.78% per page)

This would describe the home page as the most important page, then the category pages, then the sub category pages.

Reverse Pyramid: If the site were structured in the same way described above but instead each page type had the following percentage of the total links:

  • Home Page 5% (5% per page)
  • Category Pages 15% (5% per page)
  • Sub Category Pages 80% (8.89% per page)

This would describe the sub-category pages as the most important, then the category pages, then the home page.

Remember that what we are describing here is how the PageRank is distributed among the pages through links by looking at the number of links each page has as a percentage of the total internal links on the website.

There are other factors that will determine what the actual PageRank is of a page outside of this. So even with a reverse pyramid structure you may still find that the home page has the most authority.

Internal Linking Diagrams

As described above, the ratio of internal links to each page on a website helps to define the priority of webpages to crawlers. Mapping out all of the links to each page of a website helps to understand what this structure is and how it might be informing Search Engines of webpage priority.


There are a number of tools such as Raptor that can crawl a site and provide this information. Once you have this data, you can start to analyse it, putting this in a table (see example below) helps you to see what pages are linked to most.

The below table is a truncated and basic example of how to map out internal links.

Internal Linking

*To calculate the ‘% of Links’ cells, simply divide the ‘No. Of links’ for a page by the total ‘No. Of links’.

It can also be useful on larger sites and ecommerce sites to group pages together and look at the aggregated data for these groups. For example, grouping pages into products, services, informational, blog, etc can provide a good top level view.

Internal Linking Diagrams

It is also worth looking at the number of pages that link to each page of the site and mapping this against the previous data, for example:

Internal Linking Analysis

In the above table we have also included a new metric ‘Ratio of Links to Pages’, which is calculated by dividing the ‘No. Of Links’ by the ‘No. of Pages Linking’ for each page, for example:

Home Page: 56/48 = 1.17

What this means is that, on average, each page that links to the home page has 1.17 links to the home page on it. As mentioned elsewhere in this article, Google only counts the first link to any one place on a page... So in a scenario where a page has a lot of links, but few linking pages, you would not rank this as a priority page.

The internal linking diagram below is a visual map of the internal linking structure of a site, these can become large and complicated the more pages are included. These can be useful when analysing a site’s navigational structure and to understand where links are coming from, this can often be difficult to show in any functional way in a spreadsheet.

Equally diagrams can become cumbersome for practical usage by an SEO after a point, thus a blend of visual diagrams and tables can help build a complete picture of the internal linking structure.

Once the site has been mapped out, you can begin the process of defining a new internal linking structure. Setting out the ratio and number of links to each of the pages on a website. Mapping and tracking these metrics can help you to identify the cause of certain issues that can arise. If for example you notice a drop in rankings for a group of pages and you can correlate this with a significant change in the ratio of links to those pages; you may be able to establish causation and implement a solution.

How Does it Affect Rankings?

As described above, internal linking distributes PageRank throughout the site; and PageRank is a major ranking factor. Therefore, creating an internal linking strategy relevant to the website goals and objectives is critical to maximising website performance in the SERPs.

In short, well structured internal linking will improve rankings and poorly structured linking will impede rankings.

Types of Internal Linking

There are a lot of places from which you can link from on a website and also different ways of modifying links to produce a different effect, we describe each of these below.

Main Menu & Navigation

All websites should have a main menu for navigation and / or a sidebar with additional navigational options. Typically, the main navigation is replicated on every page of the site and remains consistent throughout. Secondary navigation can vary to reflect the section of a site in which it is located.

Main navigation should ideally provide the most comprehensive navigation for users, often linking to all 1st tier pages.

For more information on website navigation please follow the link.

Footer Links

The footer often contains a limited number of important links to locations such as:

  • Sitemap
  • Home Page
  • Legal info
  • Category pages
  • Contact us
  • Find us
  • Social media pages (external links)

Please follow the link for more information on footer links.

Breadcrumb Links

Breadcrumb navigation typically sits underneath the header and above the main body of content on a page and provides a structured list of links showing where the current pages sits the site structure. For example, if we consider a product page, breadcrumb navigation could look like this:

Home> Category> Product

Note that this defines where a page sits within the site and assists the user navigate (back) to related content one level up from where they are. There are a number of benefits to using breadcrumbs outside of the user experience, especially when using structured data to mark-up the breadcrumb code.

This can actually act as a description of site structure for Search Engines, even if the URL structure were flat (all page located after example.com/). 

Please follow the links for more information on Breadcrumb Navigation or Breadcrumb Structured Data.

Contextual Links

Contextual linking is when a link sits within relevant content on a page. As with this article you can see that we link out to other pages from within the main body of content... This is called contextual linking and it each link therefore sits within the context of the content that surrounds it.

The more relevant the content is to the page being linked to, the more relevance flows through to the target page.

The more relevant a link is the more powerful it is for improving rankings. Additionally, this also provides relevant information to users, at the point at where it is most relevant for them (if done well).

Follow / No Follow Internal Links

Follow: These allow PageRank to flow through to the target page. This is the default for links and doesn’t require any modification; when adding a link, unless specified otherwise, it will be a ‘follow’ link. Below is an example of a standard HTML link to the home page of example.com would look:

<a href=”http://www.example.com”>Home Page</a> - This is the code.

Home Page = This is how it would appear on the page.

Nofollow: The do not allow PageRank to flow through to the target page. To make a link ‘nofollow’, you will need to add some code:

<a href=”http://www.example.com” rel="nofollow">Home Page</a> - This is the code.

Home Page = This is how it would appear on the page (note that the nofollow tag does not change the appearance of the link).

Nofollow links are more often used for external links (links to other websites), there is little need to use nofollow links when linking internally. Here is what Google have to say about the no follow attribute. We discuss this topic in more detail in the external linking article of this knowledge base.

Nofollow internal links can be used to limit PageRank flow to pages that you do not need to deliver PageRank to like login pages or pages that you do not want indexed. Use these sparingly as there is little benefit to creating nofollow links on scale throughout a website. In 2009, Matt Cutts discussed this topic, you can watch the video here.

Image Vs. Text Links

When the Alt Tag and Anchor Text are equally optimised for the target keyword; an image link will typically pass on less relevance to target page, but equal amounts of PageRank compared to text links. This is one of the main reasons why we recommend using text links in website navigation rather than images.

That said images often provide a different set of advantages, for example; images stand out on a page and draw people’s attention to offers, or other valuable content that you want to promote. As such image links are often implemented for different reasons, but they can also be coupled with a text link to the same page with optimised anchor text.

Sitemaps

Sitemaps provide links to every page on a website (that you want to be either found, indexed or both). HTML sitemaps assist the user navigate and XML sitemaps assist robots crawl your website. Please follow the links for more information on HTML Sitemaps or XML Sitemaps.

Anchor Text

Anchor text is the text used (in a text link) to link to a target page. For example:

<a href=”http://www.example.com”>Home Page</a>

In the above code you see “Home Page” this is the anchor text for that link and this is what will be visible. The styling of links varies between sites, but typically they are underlined either permanently or on mouse-over.

Usage

Identify keywords (targeted by web pages) throughout your website’s content and turn the text into a link to the page targeting that keyword. For example: when keyword relevant to another webpage is mentioned on a page, use that term to link to the relevant page.

This improves the relevancy of the target page to the keyword it targets.

Anchor Text Ratio

Anchor TextAnchor Text Ratio

An anchor text ratio is the number of iterations of text used in anchor text as percentage of all the anchor text used to link to a page. For example, if a page is linked to 100 times throughout a website, you could use analyse the amount of times anchor text is used as a percentage, for example;

This is a much more important factor when considering back links to your website rather than internal links within the website. Due to the nature of template regions of a site containing links, it is likely that the most commonly used anchor text to your main pages will be that used in the main navigation.

Google is easily able to understand this and thus it is factored into the algorithm. It is only in extreme cases where thousands of internal links are created, in an unnatural way to a page all using identical anchor text where it could become an issue. Matt Cutts confirms this in a video from 2013.

That said it is always useful to vary the anchor text used to include variations of keywords, if you are running the risk of overusing a keyword in anchor text consider using generic anchor text on occasion such as “click here” or “for more information”.

Only in extreme cases are you likely to incur some kind of algorithmic penalty from Google as a result of unnatural anchor text usage, though it can happen.

Absolute Vs. Relative Linking

It is best practice to use ‘absolute’ rather than ‘relative’ links, meaning that the complete URL should be used when linking to a page, for example:

http://www.example.com.au/page.html - Absolute link (includes everything from ‘http’ onwards.

example.com.au/page.html – Relative link (omits the ‘http’)

/page.html – Relative link (omits domain)

Whether a link is absolute or relative is not a direct ranking factor, the primary reason for using absolute links is that relative links can cause certain problems for the SEO of your site. Although not a common issue, relative links can lead to indexing problems and crawling problems.

Because staging sites frequently use relative links due to the nature of a ‘staging site’ it is often overlooked when launching, but these should all be changed to absolute URLs.

Why is This Important?

There are a number of reasons why using absolute URLs is better than using relative ones, we have listed these below:

Crawler Time: Google wants to spend as little time as possible crawling a website, so the easier you make this for them the more likely you are to have your website crawled more efficiently.

Duplicate Content: Using absolute URLs can help prevent duplicate content issues, especially when linking from canonical tags. This also creates consistency across the site which helps to reduce multiple URL’s from being indexed for the same content.

Prevent Errors: Indexing errors can creep in when relative URLs are used, in the worst cases we have seen infinite loops and exponentially growing volumes of errors stacking up in Google Webmaster Tools. Absolute URL’s help prevent this type of error from occurring.

Custom Tracking Parameters

You should not use custom tracking parameters such as UTM code on internal links as this can cause all kinds of problems in Google Analytics.

Broken Links

Broken links are links that target a page that either does not exist or is inaccessible for some reason. These have a number of implications, none of which are good for users, robots, and website performance. We discuss this in more depth in this article on broken links.

Not Using Absolute Links

As mentioned above, absolute URL’s should be used whenever linking to any page or resource on a website.

Overuse (Too Many Links Per Page)

Before 2009 there was good reason to keep the number of links on a page to fewer than 100, due to limitations with Google’s ability to crawl more than 100Kb pages. This limit has increased with the increasing file size of web pages over the years. Hence you are unlikely to have a paged truncated when being indexed due to there being too many links.

As always there is the common sense component to this, thousands of links on a page are at best unnecessary and many may be ignored if the page is consequently too big. There is no advantage from an SEO or UX perspective to have this many links on a page.

We have previously discussed the way in which PageRank flows through links; the more links there are, the small the flow of PageRank through each link.

Therefore, it follows that keeping the number of links to just what is necessary for the User is a good rule of thumb.

Matt Cutts discusses this topic and supports what we say in this article, you can click here to see the video.

 

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