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Reporting identity

Reporting identity is the setting that decides how GA4 recognises users across sessions and devices in reports.

Written by Reflective Data experts · updated Oct 5, 2026

Options include blended (user ID, then Google signals, then device ID, then modelling), observed, and device-based. The choice affects user counts and can change numbers noticeably.

Pick one deliberately and document it, since switching changes historical comparisons.

related

Data thresholdingGoogle signalsUser ID

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