Subdomain vs Subdirectory: Which Is Best for SEO?

TL;DR: SubdomainA subdomain is a secondary website that is rooted within the parent domain. vs Subdirectory for SEO

1. Subdirectories Usually Win for SEO – Subdirectories (e.g., example.com/blog) are typically better for SEO because they consolidate authority and help search engines crawl content more efficiently.

2. Subdomains Are Treated Separately – Subdomains (e.g., blog.example.com) can be seen as separate sites by Google, which might dilute SEO value and make ranking more challenging.

3. Use Subdomains in Specific Cases – Subdomains are useful for large-scale content, ecommerce sections, different regions/languages, or complex integrations like separate CMS platforms.

4. Subdirectories Are Better for Simpler Setups – For small to mid-size websites with limited content or a unified purpose, subdirectories offer better SEO performance and a cleaner user experience.

5. Choose Based on Your Needs – While subdirectories generally offer stronger SEO advantages, subdomains can be the right choice for organisational clarity, testing, or regional targeting.

Which is the best for search engine optimisation (SEO): subdomain or subdirectory? It is a question asked by many of those in the digital marketing world. After all, technical SEO is an integral component of any strategy, and getting every aspect right – including whether to use subdomains or subdirectories – is necessary to hit the top spot in the Google Search rankings.

In the subdomain vs subdirectory battle, there are various points to consider. This guide will explain what they are, the differences between the two, and how they influence SEO for your website.

What Is a Subdomain?

A subdomain is a type of structure where content is effectively split up across separate websites – although everything is kept organised within the same domain. Confused? Okay, let us try and clear it up with the following example:

• Root domain URL: Clickintelligence.co.uk
• Subdomain URL: guide.Clickintelligence.co.uk

As you can see, the subdomain precedes the root domain URL. This results in each subdomain standing next to each other as extensions rather than everything being found within the same folder. This separation extends to everything from analytics to content management – as we say, think of each subdomain being like its own website.

Why would you opt for a subdomain structure rather than getting new domains? When it comes to the subdomain vs domain debate, the former has advantages such as not costing any extra, being able to target specific audiences, and giving you a platform to test new content.

What Is a Subdirectory?

You know about subdomains. However, what are subdirectories? In the subdomain vs subdirectory comparison, you will see that both are similar in their structure. The main difference is that, unlike a subdomain where content is placed on its own island, subdirectories see all of the content being located in the same place.

Even if you weren’t previously familiar with the terminology, you will have seen subdirectories in action many, many times. In fact, take a quick glance at the URL bar above – this page is even located within one. To explain it clearly, here’s an example of a URL subdirectory:

• Root domain URL: Clickintelligence.co.uk
• Subdirectory URL: Clickintelligence.co.uk/guides
• Subdirectory URL: Clickintelligence.co.uk/guides/solutions

That’s right: you can have a subdirectory within a subdirectory ad infinitum. This allows you to nestle all of your content within one destination.

Avoid Going Overboard with Subdirectories

On the topic of subdirectories, there is one important point to consider: creating too many subdirectories. Yes, a website subdirectory is a great way to organise content. Yet it is highly recommended you avoid throwing too many subfolders into the filing cabinet. There are two reasons for it: SEO and user experience.

An SEO Audit covers subdirectory URLs for a reason. If these URLs are too long and convoluted, search engine crawlers will have a hard time finding any new content posted on your website. Think about it. The more crawlers have to deep dive to find your pages, the less likely they’ll discover everything you have posted.

That’s not good for your marketing efforts or the ability to craft an SEO-Friendly URL.

As for the user experience, long URL strings can quickly create confusion. One of the main aims for any website to nail is to craft a platform that’s easy to navigate. When a large number of subfolders are used, it becomes increasingly difficult to keep everything in order. This can lead to frustrated users, and that, in turn, may see them leave your site – which further impacts your SEO efforts.

Side note: if you’re wondering what is a subfolder, don’t worry. It is the same as a subdirectory – both terms are interchangeable.

Subdomains vs Subdirectories: When to Use a Subdomain for SEO

When it comes to the subdomain vs subdirectory SEO battle, both understandably have their own advantages. However, some marketers are a little bit more sceptical about subdomains than their counterparts. How do subdomains affect SEO? Do subdomains help SEO? Do subdomains hurt SEO?

These are the types of questions we see on the subject of subdomain SEO.

With subdomains and SEO, there are certain instances where it is appropriate to go this route with a website’s structure. These instances include:

• Large volume of content: If you have a huge volume of content, so much that it’s not feasible to host on a single website, it can be wise to go with a subdirectory URL By spreading content across numerous subdomains, it can make it easier for specific pages to be found by searchers.
• Blog: A blog subdomain is one of the more controversial topics revolving around the subfolder vs subdomain However, if an organisation plans to have multiple content campaigns, it can be wise to opt for a subdomain/subdirectory combination and benefit from both sides.
• Ecommerce store: With subdomain vs root domain, a lot of companies will opt for a subdomain for their ecommerce store. This can make it easier for not just their customers but also their website design. The latter is because some ecommerce coding is not compatible with their primary domain.
• Different geographic regions: Does your business target multiple regions? If this is the case, and you’re dealing with various languages or large geographic differences, separating these with subdomains can be beneficial.

With situations like these, SEO subdomains can be a useful approach. Do you think subdomains could be more beneficial for your business, but you are currently stuck with subfolders? A professional Website Migration service can make the transition a seamless one.

Read more: Ultimate Guide to Website Migration

Subdirectory vs Subdomain: Using Subdirectories for SEO

What is a subdirectory from an SEO perspective? If you asked an SEO consultant, most would say it’s more appropriate than going with subdomains. For example, the URL subdirectory can be a small – yet helpful – way to add key search terms for that extra little SEO push.

Read more: Drop in KeywordKeywords are the words and phrases that potential customers might search for to find your business. Rankings and How to Fix It

Of course, that is only scratching the surface. You have to dig deeper to see the technical performance of subdirectories. A lot of SEO experts – including us – would say that it is better for acquiring more traffic through Google search results. The result: you achieve a higher ranking and gain better overall SEO results.

Why is that the case? The professionals have analysed both options, and they’ve noticed that mistakes can be made by Google’s web crawlers when looking at subdomains. They can mistake them for completely different websites. That’s not good. It can hurt page authority, linksHyperlinks, also known as links, are the connection points on a webpage that take you to other webpages., and your SEO performance in general.

With subdirectories, there’s plenty of evidence that shows organic trafficOrganic search traffic (sometimes called natural or unpaid search) is the traffic that's driven to a website because of unpaid placement on a search engine results page. can receive a big bump when a website that was previously using subdomains is transferred to a subdirectory.

Subdomain or Subfolder: Which Is Better for SEO?

When it comes to SEO, subdomain vs subdirectory comparisons can make things a little complicated. This isn’t helped by the information out there. Google says both categories are judged equally. Statistics suggest subdirectories receive favouritism from search engines.

In certain cases, SEO and subdomains are the better combination. We sometimes consider using it for our Enterprise SEO for websites with large amounts of content and targeting a global market. However, for smaller companies with smaller budgets, less content, and minimal extensive vehicles, the better choice is generally viewed as subdirectories.

Conclusion

Yes, in the subdomain vs subdirectory debate, the latter comes out on top in most cases. Yet there’s a reason why both are considered for our Managed SEO service – they both carry value. Subdirectories supply better rankings, user experiences, and SEO results. However, if you are trying to rank for a different niche with your blog or you want to separate your support centre or hosting forms, SEO for subdomains can work effectively.

Do you want to move your website from one category to another? Make sure to check our Free Website Migration Checklist. You can also get in touch for advice on whether the move is right or if you need direct assistance getting the task done.