What the _gcl_au cookie does
Used by Google AdSense for experimenting with advertisement efficiency across websites using their services.
Who sets it
Consent category: marketing
Marketing cookies follow visitors across sites to build advertising profiles and to measure campaigns. They always require prior consent, and a consent banner has to block them until the visitor agrees.
| Name | _gcl_au |
|---|---|
| Category | Marketing |
| Lifetime | 3 months |
| Set by |
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From the Conzent cookie database, last updated 2026-09-27. Descriptions come from vendor documentation, cookie policies and our own scans; write to support@getconzent.com to correct one.