Google Says Subdomains and Subfolders Are Treated Equally
And technically, that is true.
But "technically true" and "practically true" are different things.
The Case for Subfolders
Subfolders inherit domain authority directly. A blog at `example.com/blog` benefits from every backlink pointing to `example.com`. The authority flows naturally.
Internal linking between your main site and blog is seamless. Same domain, same site architecture. This directly impacts your SEO strategy fundamentals.
Google Search Console shows everything in one property. One view. One dataset. Easier to manage.
The Case for Subdomains
Subdomains can run on completely different tech stacks. Your main site on Shopify, your blog on WordPress, your docs on a static site generator — each on its own subdomain.
Subdomains can be hosted on different servers. Useful for large organizations with separate teams.
What the Data Shows
In practice, sites that move blogs from subdomains to subfolders almost always see traffic increases. Not because Google penalizes subdomains, but because consolidation concentrates authority and simplifies the link graph.
The opposite move (subfolder to subdomain) almost always sees traffic decreases, at least temporarily.
The Verdict
Use subfolders unless you have a compelling technical reason for subdomains. The SEO benefit of consolidation is real, even if Google says there is no difference. It also makes URL structure cleaner and backlink authority more concentrated.
After 20+ years and 500+ campaigns, we have seen this pattern enough times to be confident.
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