Google Analytics Client ID vs User ID

[@rcbilly2009]

I would like to see more of this interesting topic. Great video thank you

[@ranveermohite1718]

I've been watching your videos recently. Very very useful. Thank you for the amazing content you share.

[@lfc1981]

like to see more GA4 top used functions, or top most under-used but insightful features?

[@AnalyticsAbir]

Excellent explanation of Client ID vs. User ID in GA4! 👏 The differences and use cases you outlined make it much clearer how to choose the right one for tracking.

[@zakariaelou]

How to set the User-ID only if a user gave consent for ad_analytics cookie? Is that mandatory for GDPR Compilance? Thank you

[@grizfan93]

If anyone is struggling to track conversion data (in Google Ads or GA4) when the website has a third-party checkout system embedded in an iFrame, this is why tracking is failing. It is possible to maintain a client-ID between the parent page and child page in the iFrame, but that is super-advanced, and requires you to have a lot of control over the code on both sites. I spent months trying to sort this out, before giving up and going with a new vendor for the checkout system where we didn't need to use the iFrame.

[@GreenParsley00FF00]

That is why most websites have thankyou/success pages with dataLayers. You track the conversion on that page if possible.

[@grizfan93]

@@GreenParsley00FF00 ah -- but that doesn't really help here. Yes, you can capture order data through the data layer, but it doesn't address the root problem that the clientID changes, so even though GA4 captures the order and data, the link to the origin of that order is lost. Someone clicks an ad, lands on the home page, visits some other pages, then checks out. All that activity prior to checkout is lost, since the checkout is in an , a new client ID is generated, breaking that chain. So you see the order, but have no idea what marketing channel, landing page, paid ad or other marketing activity led to that order. That's the problem.