Set Up Google Analytics Cross-Domain Conversion Tracking with Google Tag Manager (GTM)

There are a lot of situations where you may have your website visitors bounce around across your root domain (yourdomain.com) and sub-domains (subdomain.yourdomain.com).

I recently had this situation arise for myself. I have my Ghost blog hosted on the root domain (freak.marketing) and since I can't easily edit this theme to add a proper direct response optin page for my new online course, I used Carrd.co (aff link) to create it. I then pointed the landing page at a sub-domain (stripe.freak.marketing).

Simply adding the Google Analytics script to this sub-domain isn't going to give me accurate conversion data. For example, let's say a visitor comes in to Freak.Marketing via organic search. They then click over to stripe.freak.marketing where the Carrd lead magnet page is pointing and optin there.

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