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).

Device ID

A browser-based or mobile-app-based identifier for a unique, anonymous website or mobile app user.

On a website, device ID gets its value from the client ID property of the _ga cookie. In an iOS or Firebase app, device ID gets its value from the app-instance ID, which identifies a unique installation of the app.

Device ID is one of the available reporting identity spaces.

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