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Question

How to link a user between GA4 and Amplitude

  • February 11, 2025
  • 3 replies
  • 50 views

We have certain events of trial clicks in GA4 and rest of in app product usage in Amplitude.

What I intend to do is to build a funnel starting from the trial clicks (GA4) to in app product usage (Amplitude)

Is there any way to tie the user data between the 2 sources ?

Any sort of integration that makes it possible to identify the user of both data sources to be the same user?

3 replies

Saish Redkar
Expert
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  • Expert
  • 1377 replies
  • February 11, 2025

Hi ​@Kavitha Jayaram 

I don’t have much familiarity with the GA4 migration, but for your use case you will need to have atleast one of the trial click event ingested in Amplitude to initiate the funnel analysis.

You could either set up a GA4 import for those critical clicks events in Amplitude (https://amplitude.com/docs/data/source-catalog/ga4 ) or setup event forwarding if that fits your SDK instrumentation ( https://amplitude.com/docs/migration/migrate-from-google-analytics

 


  • New Member
  • 1 reply
  • February 12, 2025

If using GTM, I would set up a javascript variable to get the Amplitude session id, then send that as an event property with your GA4 event(s)


eddie.gaona
Team Member
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  • Amplitude Support
  • 161 replies
  • February 13, 2025
Hello Kavitha,

Hope you are well!

Amplitude and GA4 currently does not have an integration where it can map users together. Amplitude uses a combination of User IDs, Device IDs, and Amplitude IDs to track unique users. To ensure accurate user mapping, make sure that your instrumentation aligns across both platforms. You can learn more about how Amplitude identifies users in our **User Identification Guide****:****https://amplitude.com/docs/get-started/identify-users**.

That being said if you can keep the Device ID and/or User ID the same between GA4 events and Amplitude events then our system will see them as the same user. If you're using the Browser SDK there is ways to set/retrieve the Device ID and set a User ID. These could be tools you can leverage to set in GA4 events or set GA4 IDs as User or Device ID in Amplitude. Documentation: https://amplitude.com/docs/sdks/analytics/browser/browser-sdk-2#custom-device-identifier.

Hope this helps!

-Eddie


P.S. Checkout upcoming events and user meetups on our events page.

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