Google Ads sets 4 cookies on websites that load its scripts. Below is the full list with purpose, expiry, and whether each one needs GDPR / ePrivacy consent.
_gcl_auAdvertisingExpires: 3 monthsGoogle Ads conversion-linker cookie. Stores ad-click information so conversions can be attributed outside Google's domain.
_gcl_awAdvertisingExpires: 3 monthsGoogle Ads click-through cookie set when a visitor lands on the site from a Google search ad. Used for attribution.
_gcl_dcAdvertisingExpires: 3 monthsGoogle Ads / DoubleClick click-through cookie set when a visitor arrives from a Display Network ad.
_gac_<property-id>AdvertisingExpires: 3 monthsContains campaign-related information for the user. Linked to GA properties that have Google Ads auto-tagging enabled.
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