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Set the custom domain in GitBook
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Choose a subdomain
This is step 1 of a 3-step process for setting up a custom domain. Make sure to follow the steps in the correct order!
  1. 1.
    Choose a subdomain (you are here)
  2. 2.
    ​Configure DNS​
  3. 3.
    ​Set the custom domain in GitBook​
Only subdomains can be used to serve your documentation. It's not possible to use an apex domain.
Here are some examples of what you could and could not choose — just replace example.com with your own domain:
Domain type
Example
Supported?
Apex domain
example.com
❌
www subdomain
www.example.com
✅
Custom subdomain
docs.example.com
help.example.com anything.example.com
✅
Once you've chosen your subdomain, you can move onto step 2: configuring DNS.
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Configure DNS
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