How to Track HubSpot Form Submissions in GA4 Using Google Tag Manager

Tracking HubSpot form submissions in GA4 isn’t automatic, but with the right setup in Google Tag Manager, you can capture every form submission and understand which channels, pages, and campaigns drive conversions.

In this advanced step-by-step tutorial, we walk through how to:

• Create a custom HubSpot form submission event in Google Tag Manager

• Pass form ID and form name into the GA4 data layer

• Build a GTM lookup table to translate HubSpot form IDs into readable names

• Register custom dimensions in GA4 so you can report on form performance

• Build a dedicated HubSpot Form Submissions report inside GA4

• Troubleshoot issues like missing form data or “not set” values

This video is ideal for advanced GTM/GA4 users and teams managing HubSpot integrations.
If you’re a marketer, feel free to share it with your web or analytics team. At Geear, we configure this full setup for our credit union clients as part of building a strong marketing analytics foundation.