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Change historychevron_rightGoogle Tag & Tag Managerchevron_rightDec 11, 2025

GTM added Client ID, Session ID and Session Number built-in variables plus an Analytics Storage variable

Product: Google Tag & Tag ManagerCategory: LaunchArea: MeasurementStatus: LiveImpact: MediumSource type: Official
Date
Dec 11, 2025
Regions
Global
Primary source
Tag Manager Help

Three new built-in variables in the Utilities category give an officially supported way to read GA4 client and session identifiers in Tag Manager, and a new Analytics Storage user-defined variable type supports a measurement ID and custom cookie prefix.

Replaces the common workaround of reading _ga cookies with custom JavaScript variables; useful for enhanced conversions, server-side joins and BigQuery stitching.

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