Subdomain vs subfolder for SEO: which should you use?

What is a subdomain?

A subdomain is a prefix added before your main domain name, such as shop.example.com or help.example.com. Technically, it can point to a different server and run completely different software from the main site.

Common uses include support centres, web applications, staging sites, job boards and stores that run on a separate platform.

https://help.example.com/reset-password
        ^^^^ subdomain

What is a subfolder?

A subfolder, also called a subdirectory, is a folder path after the main domain, such as example.com/blog or example.com/services/roofing. It is part of the same site, on the same host name, with the same domain level history.

Most websites use subfolders for almost everything: blog posts, service pages, product categories and location pages.

https://example.com/blog/reset-password-guide
                    ^^^^ subfolder

How Google treats subdomains and subfolders

Google representatives have said for years that its systems can crawl, index and rank both subdomains and subfolders, and that you should choose the structure that is easiest for you to maintain. In Search Console, a domain property covers all subdomains together, while URL prefix properties can track them separately.

In practice, there is a difference that matters for smaller sites. A subdomain can be treated more like its own site, with its own signals. A subfolder benefits directly from the links, history and internal linking of the main domain. Many published migrations from blog subdomains to subfolders have reported traffic gains, which is why most SEOs recommend subfolders unless there is a strong reason not to.

What Google has said, and what SEOs see in practice

Google's public position is that it can handle both setups. Its staff have said many times that its systems work out which parts of a site belong together, whether they live on a subdomain or in a subfolder, and that you should choose what is easiest for you to maintain.

Many SEO teams report a different pattern in practice. When blogs, guides or stores move from a subdomain into a subfolder, they often see the content rank better over the following months, because links, internal linking and topical signals now sit in one place. Neither view is wrong. Google can understand subdomains, but a subfolder makes it easier for your content to share strength with the main site without extra work. That is why, for most businesses, the subdomain vs subfolder SEO decision leans toward subfolders unless there is a clear reason not to.

Subdomain vs subfolder vs separate domain

Each step away from the main domain means more separate work on links, content and tracking.

Subdomain vs subfolder: side by side

Pros and cons of using subfolders

Pros and cons of using subdomains

When to use a subfolder

1. 1Your blog, guides and resources, which exist to support rankings for the whole site.
2. 2Service and product pages that belong to the same business.
3. 3Location pages for areas you serve.
4. 4Landing pages for campaigns that should benefit from the main domain.
5. 5Language or country versions when one team runs the whole site.

When a subdomain makes sense

1. 1A web app or customer login area that has no need to rank.
2. 2A help desk or knowledge base hosted on a third party platform.
3. 3A separate brand, franchise or business with its own audience.
4. 4Testing and staging environments, which should also be blocked from indexing.
5. 5Very large sites where a section has its own team, technology and link profile.

Subdomains, subfolders and international SEO

International sites have a third option: a country code domain, such as example.de. Each choice has trade offs for cost, authority and local trust. Whatever you choose, use hreflang tags so search engines show the right language version to the right users.

For multi country plans, our international SEO service helps choose the right setup for each market.

How to move a subdomain into a subfolder without losing rankings

1. 1Crawl the subdomain and export every URL, title and status code.
2. 2Map each old URL to its new subfolder URL, one to one wherever possible.
3. 3Set up the new pages on the main domain, keeping content, titles and headings the same at first.
4. 4Add permanent 301 redirects from every old URL to its new home.
5. 5Update all internal links, canonical tags, hreflang tags and XML sitemaps to the new URLs.
6. 6Submit the new sitemap in Search Console and watch crawl errors, indexing and traffic for at least 8 weeks.
7. 7Keep the redirects in place for the long term, not just a few months.

Moves like this go wrong when redirects are missed or chained. If you are planning one, our website migration SEO service handles URL mapping, redirects and post launch checks.

Common scenarios and what we recommend

How to serve a subfolder from another platform

Sometimes the tool you want only runs on its own server. A reverse proxy lets you show it at a subfolder of your main domain, so visitors and search engines see example.com/blog/ even though the content lives elsewhere. A developer sets this up on your web server or CDN.

# Nginx example: serve a hosted blog at /blog/
location /blog/ {
  proxy_pass https://yourblog.hostedplatform.com/;
  proxy_set_header Host yourblog.hostedplatform.com;
  proxy_set_header X-Forwarded-Host example.com;
}

After setting this up, check that canonical tags, sitemaps and internal links all use the subfolder URLs, not the platform's own address. Our technical SEO team handles this kind of setup.

Tracking subdomains and subfolders correctly

Link the two parts of your site together

If you do use a subdomain, strong linking between it and the main site helps search engines and visitors treat them as one brand.

1. 1Add the subdomain to the main navigation or footer where it makes sense.
2. 2Link from subdomain articles to relevant service or product pages on the main site.
3. 3Link from main site pages to helpful subdomain content.
4. 4Use the same logo, brand name and design so visitors know they are in the same place.
5. 5Use consistent organization schema across both.

Monitoring after a move to a subfolder

1. 1Check that every old subdomain URL returns a 301 redirect to its matching subfolder URL.
2. 2Submit the new sitemap and keep the old one available for a few weeks so Google finds the redirects.
3. 3Watch the Page indexing report for new errors.
4. 4Compare clicks and rankings for moved pages each week for the first two months.
5. 5Update internal links, profiles and important backlinks to the new URLs.
6. 6Keep redirects in place for at least a year, ideally permanently.

Expect some movement for a few weeks. Most well planned moves settle within one to three months.

Subdomain vs subfolder myths

A simple way to decide

1. 1Ask whether the content should rank in search. If not, such as a login area, a subdomain is fine.
2. 2If it should rank, ask whether it supports your main services or products. If yes, lean toward a subfolder.
3. 3Check whether your platform can serve the content in a subfolder, either directly or through a reverse proxy.
4. 4If it cannot, compare the cost of switching platforms with the extra SEO effort a subdomain needs.
5. 5Consider the audience. A truly separate audience or brand can justify a subdomain or separate domain.
6. 6Write down the decision and the reason, so future changes do not undo it by accident.

Effort and cost compared

The choice is not only about rankings. It changes how much work your team does every month.

For most small and mid size businesses, the lower ongoing effort of a subfolder outweighs the extra setup. If you are unsure, our SEO consulting team can review your setup.

Subdomains for testing and staging

Staging sites often live on subdomains such as staging.example.com. That is fine, but they must be kept out of search. Protect staging with a password, or at least a noindex tag and robots.txt rule, so unfinished copies of your site never compete with the live version. Check for indexed staging pages with a site:staging.example.com search every few months.

Signs your subdomain is holding you back

If you see two or more of these, test moving a small group of pages into a subfolder with redirects and compare the results after two to three months.

Common mistakes to avoid