This article is about Google Analytics 4 properties. Refer to the Universal Analytics section if you're still using a Universal Analytics property, which will stop processing data on July 1, 2023 (October 1, 2023 for Analytics 360 properties).

User-ID [GA4]

A customer-generated ID used to differentiate between users and unify user events in reporting and exploration.

User-ID for Google Analytics 4 properties
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