Technical SEOPublished26.05.2026

Subdomain vs. subdirectory

Subdomain (blog.site.ru) or subdirectory (site.ru/blog) — the structure choice affects how Google distributes authority and link equity. For SEO, a subdirectory is usually preferable.

In brief

A subdomain is a separate third-level domain (blog.example.com) that Google may treat as an independent site. A subdirectory is a section within the main domain (example.com/blog) that inherits the main site's authority.

The difference between a subdomain and a subdirectory

A subdomain is a separate third-level domain: blog.example.com, shop.example.com. Technically and from a DNS perspective, it is a separate host that Google has traditionally treated as an independent site.

A subdirectory (subfolder) is a section within the main domain: example.com/blog, example.com/shop. Content in a subdirectory is part of one site and inherits its link profile and authority.

John Mueller from Google has repeatedly stated that both options work. Nevertheless, most SEO practitioners and case studies confirm that subdirectories gain authority faster by inheriting the domain's link profile.

SEO impact

FactorSubdomainSubdirectory
Domain authorityNot inherited from main domainInherited directly
Link equityMust build from scratchReceives from main domain
Ranking growth speedSlower for new sectionFaster due to authority inheritance
Separate brandEasier to build separate identityHarder to separate brands
Technical setupFull flexibility (separate server)Single platform and config
Crawl budgetOwn crawl budgetShares budget with main site

When a subdomain is justified

  • Different products or audiences: shop.example.com for an e-commerce store and help.example.com for a knowledge base — different functionality and topics
  • Multilingual sites: some companies use subdomains for language versions (en.example.com, de.example.com), though hreflang with subdirectories works just as well
  • Technical limitations: the CMS or platform doesn't support subdirectories on the main domain
  • Separate team: the subdomain is managed by a different tech stack or team without access to the main site

When a subdirectory is preferable

  • Blog and content marketing: site.com/blog receives the domain's link equity and ranks faster
  • New section on a mature domain: a subdirectory immediately receives authority; a subdomain needs time to build it
  • E-commerce categories: site.com/catalog/shoes — the entire site is perceived as one unified store
  • No technical limitations: if the platform allows it — always choose a subdirectory

Migrating from subdomain to subdirectory: key considerations

  1. Set up 301 redirects from all old subdomain URLs to the new subdirectory URLs
  2. Update sitemap.xml — include the new subdirectory URLs
  3. Update internal links — replace all references to the subdomain
  4. Notify Search Console: remove the subdomain as a separate property after migration
  5. Give Google time to reindex — rankings may fluctuate temporarily in the first weeks
FAQ

Common questions

Officially — yes. In practice, most SEO specialists observe that new content in a subdirectory ranks faster because it inherits the domain's authority. A subdomain has to build authority from scratch.
A subdirectory is typically indexed faster — crawlers already know the main domain and visit it regularly. A subdomain as a new host may wait longer for its first crawl.
If the blog on the subdomain has been around for a while and has its own link profile — carefully assess migration risks. Moving can yield long-term gains, but will cause short-term ranking fluctuations. For new projects, always start with a subdirectory.
For local SEO, subdirectories are preferable: the main domain's full authority supports the regional pages. Promoting subdomains for regions requires separate efforts, which is significantly harder.
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