To set up GA4 cross-domain tracking, use the same Google tag ID on every domain, then add your domains under Admin > Data collection and modification > Data streams > your web stream > Configure tag settings > Configure your domains.
GA4 cross-domain tracking keeps one visitor as one user when that visitor moves between your domains. Without it, GA4 counts the visitor as two separate users. This guide is for webmasters, marketers, and business owners who run more than one domain.
I explain how cross-domain tracking works, when you need it, two ways to set it up, and how to check that the _gl parameter passes between your sites.
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