In this article · 10 sections
- How search engines see them
- Comparison
- When to choose a subfolder
- When a subdomain makes sense
- Moving a blog from subdomain to subfolder
- Practical tips
- Quick decision guide
- Tracking across subdomains
- Frequently Asked Questions
- Does Google penalise subdomains?
- Can my Shopify store be in a subfolder?
- Should my CRM or admin be a subdomain?
- What about regional versions like Canada?
- Need help structuring your site?
When adding a blog, an online store, a booking system or a regional version to your website, you face a choice of address:
- Subfolder:
yourbusiness.com/blog - Subdomain:
blog.yourbusiness.com
Both work technically. The difference is in how search engines and analytics treat them, and how easy they are to maintain.
How search engines see them
Google says it can understand both structures and treats subdomains and subfolders similarly in many cases. In practice, many SEO professionals find that content in a subfolder benefits more directly from the main site's existing authority, because it's clearly part of the same website. Subdomains are more likely to be treated as separate sites that must build their own signals.
For most small and medium businesses, that's the deciding factor: you want your blog's links and popularity to strengthen your service pages, and vice versa.
Comparison
| Subfolder (/blog) | Subdomain (blog.) | |
|---|---|---|
| SEO strength sharing | Generally stronger and simpler | Often weaker; behaves more like a separate site |
| Internal linking | Natural | Works, but feels like linking to another site |
| Search Console | Covered by domain property | Covered by domain property; separate URL-prefix properties if needed |
| Analytics | Same GA4 setup | Needs cross-domain-style setup in some cases |
| Technical setup | Needs to run on the same server or a reverse proxy | Easy to point to a different server or platform |
| Separate technology | Harder | Easy (e.g., store on Shopify, site on custom PHP) |
When to choose a subfolder
- Blogs and guides — almost always.
- Service and location pages.
- Product catalogues on the same platform as your site.
- Language versions like
/hi/or/pa/. See multilingual websites. - Country versions such as
/ca/for Canada.
When a subdomain makes sense
- Separate platforms: a store on Shopify, a help centre on a support tool, a booking system from a third party.
- Apps and portals:
app.,portal.,crm.,admin.— areas that don't need to rank. - Staging:
staging.for testing, protected from Google. See staging sites. - Genuinely separate businesses under one brand.
- Email and technical services:
mail.,cdn.
Moving a blog from subdomain to subfolder
If your blog is already on a subdomain and getting little traffic, moving it into a subfolder can help. Plan carefully:
- Map every old URL to its new URL.
- Move content and set up 301 redirects from each old URL. See redirect guide.
- Update internal links, sitemaps and canonical tags.
- Monitor Search Console for errors.
Expect some ranking fluctuation for a few weeks. Our migration checklist covers the full process.
Practical tips
- Use the same design, header and navigation for the blog so visitors feel they're on one site.
- Link blog posts to relevant services and vice versa.
- Verify a Search Console domain property to see all subdomains together.
- Avoid creating many subdomains for keywords (like
ludhiana.yoursite.com) — it splits authority and is harder to manage.
Quick decision guide
- Content you want to rank (blog, guides, services, locations, languages): subfolder.
- A separate platform or application that you can't run in the same codebase: subdomain.
- Private areas (admin, CRM, staging): subdomain or protected folder, never indexed.
Tracking across subdomains
If you do use subdomains, configure GA4 so sessions moving between the main site and the subdomain aren't split, and verify a Search Console domain property so you see all subdomains together. This keeps your reports accurate.
Frequently Asked Questions
Does Google penalise subdomains?
No. Subdomains aren't penalised; they may just need to build their own strength.
Can my Shopify store be in a subfolder?
Not easily; Shopify normally runs on its own domain or subdomain. Many businesses use shop. for this reason.
Should my CRM or admin be a subdomain?
A subdomain or protected folder both work. Keep it behind a login and out of search results.
What about regional versions like Canada?
A subfolder such as /ca/ with hreflang tags is usually simplest for small businesses.
Need help structuring your site?
Joboo Web plans site structures and migrations. See website structure guide or contact us.
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