TL;DR: Dashboard → Advanced Settings → Subdomain Sharing toggle → On. A visitor's consent on your primary domain automatically applies to all subdomains — no repeat banner needed.
Overview
Subdomain sharing is disabled by default. When disabled, consent only works on your primary domain — the www version of your domain is included automatically. If your website uses additional subdomains (e.g., blog.example.com, app.example.com), visitors would see the consent banner again on each one unless you configure sharing.
Before You Begin
Make sure you have:
Time required: 2 minutes
How to Enable Subdomain Sharing
Step 1: Open Advanced Settings
Navigate to Advanced Settings in your site's top navigation bar.
Step 2: Turn on Subdomain Sharing
Under Domain Configuration, find the Subdomain Sharing section and toggle on Share consent across all subdomains.
Done!
Consent given on your primary domain now applies to all subdomains automatically.
✅ Success indicator: The page updates to show "Adding subdomains is optional when sharing is on."
What's Next
After configuring subdomain sharing, you may also want to verify that consent is being recorded correctly:
View your Consent Log to confirm consent is being captured across your domains
Review Cookie Auto-Blocking to ensure cookies are enforced correctly on all subdomains
Troubleshooting
The banner still appears on my subdomain after enabling sharing
Why this happens: The visitor's browser may have a cached consent state from before sharing was enabled, or the Consently script may not be installed on that subdomain.
Solution:
Clear your browser cache and cookies, then reload the subdomain
Verify that the Consently embed script is installed on all subdomains where you want consent to be recognized
Confirm that the primary domain in Consently matches the root domain of your subdomains exactly