Track HubSpot Form Submissions
with Google Tag Manager and Google Analytics

HubSpot marketing page – updated for 2025

HubSpot is a powerful Customer Relationship Management (CRM) tool that is favoured by a number of our clients – most notably in manufacturing and agricultural space. Hubspot brings together analytics, pipeline management, marketing analytics and sales conversion data – it’s an incredibly powerful tool.

We use HubSpot to enable our clients to manage their Existing Customer Marketing (ECM) activity as well as to optimise our digital marketing campaigns including Paid Search, Banner Ads, and Social Media Marketing campaigns – particularly when we’re looking to drive leads and prospective customers to our clients sales teams.

HubSpot can integrate with a range of website Content Management Systems – unfortunately for us and our developer, HubSpot likes to utilise iFrames to populate the forms, which can mean that measuring Form Submissions in HubSpot can be a bit trickier than normal.

If you can’t measure it, you can’t manage it

If the in-market activity is designed to deliver leads and prospective customers, then it’s absolutely essential we’re able to measure this alongside all the activity we’re running, so we created this guide to help you measure HubSpot form submissions in Google Analytics using Google Tag Manager.

Important points to note

Are you using an iframe?

If you’ve embedded your HubSpot form using the default iframe code, Google Tag Manager won’t be able to see when someone hits Submit. It’s a cross-domain tracking problem: your site and HubSpot can’t talk to each other in that setup. It’s one of the reasons our Media team can’t stand iFrames. Jerome reckons they’re great – quick and easy to drop in — but they make proper tracking a nightmare.

To track submissions properly, you’ve got two options:

• Use a thank-you page redirect and fire a GTM tag when that page loads
• Replace the iframe with an inline embed (using hbspt.forms.create) so your tracking scripts can actually do their job
• Need help switching to inline embeds or setting up the redirect method? Just drop us a message at hello@fizzypop.nz.

Overview

To ensure we’re successfully measuring HubSpot form submissions we need to:-

• Step 1:- Create a Custom HTML tag in Google Tag Manager.
• Step 2:- Add a dataLayer variable to read the form’s GUID.
• Step 3:- Create a trigger that fires on the form success event.
• Step 4:- Add a Google Analytics Event Tag that reports the data to GA4

Step 1:- Create a Custom HTML tag in Google Tag Manager

Tag Type:- Custom HTML

Tag Name:- Forms – HS Success Listener

Triggering:- All Pages

Custom HTML tag content:-

<script type="text/javascript">
window.addEventListener("message", function(event) {
if(event.data.type === 'hsFormCallback' && event.data.eventName === 'onFormSubmitted') {
window.dataLayer.push({
'event': 'hubspot-form-success',
'hs-form-guid': event.data.id
});
}
});
</script>

As per the below screenshot:-

This will ensure that every page has the custom script injected into the page – this script pushes hs-form-guid to the dataLayer once a successful HubSpot submission occurs.

Step 2:- Add a dataLayer variable to read the HubSpot form’s GUID.

GTM Name:- Forms – hs-form-guid

Variable Type:- Data Layer Variable

Variable Name:- hs-form-guid

As per the below screenshot:-

Now we have a variable that matches hs-form-guid in dataLayer.

Step 3:- >Create a trigger that fires on the form success event.

Trigger Type:- Custom Event

Trigger Name:- Hubspot Form Trigger

Event Name:- hubspot-form-success

Trigger Fires On:- All Custom Events

As per the below screenshot:-

Now when hs-form-guid is pushed to the dataLayer, our trigger fires – now we just need to create an event tag that is linked to the Trigger.

Step 4 – Create a GA4 Event Tag

Tag Type:- Google Analytics GA4 Event

Tag Name:- GA4 | Hubspot Form Submit

Measurement ID:- Your Google Analytics G-Stream ID

Event Name:- hubspot_lead

Event Parameters:-

Name:- Page URL Value {{Page URL}}

Name:- Click Text Value {{Click Text}}

As per the below screenshot:-

Now when our trigger fires – the event occurs. This can be measured in Google Analytics 4 (GA4) – once in GA4 we can then use this event to optimise our google ads as a successful conversion event!

Summary

HubSpot is one of the leading CRM Systems particularly in the manufacturing and agricultural sectors – ensuring that it works seamlessly with your website, with your analytics and with your marketing campaigns is absolutely paramount.

If you need help integrating HubSpot into your marketing analytics or if you need help generating quality leads that convert, don’t hesitate to get in touch.

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