Google sets 8 cookies on websites that load its scripts. Below is the full list with purpose, expiry, and whether each one needs GDPR / ePrivacy consent.
NIDAdvertisingExpires: 6 monthsContains a unique ID Google uses to remember preferences (preferred language, ad personalisation) and to show targeted ads on Google services and across the web.
CONSENTFunctionalExpires: 2 yearsRecords the visitor's consent decisions on Google properties. Set on google.com and propagated to embedded YouTube, reCAPTCHA, and Maps.
1P_JARAdvertisingExpires: 1 monthUsed by Google to gather website statistics and track conversion rates. Set when Google domains are embedded (YouTube, reCAPTCHA, Maps).
SOCSFunctionalExpires: 13 monthsStores the user's consent state for Google services (e.g. cookie-banner choices on YouTube, Search). Read by Google embeds on third-party sites.
SIDAdvertisingExpires: 2 yearsGoogle account session cookie. On third-party sites (via YouTube, Maps, or reCAPTCHA embeds) it enables Google to identify a signed-in visitor across the web — a tracking-capable identifier that requires consent in EU/UK contexts.
HSIDAdvertisingExpires: 2 yearsCompanion to SID, signed to prevent forgery. On third-party sites surfaced through Google embeds, it contributes to cross-site visitor identification and ad personalisation.
__Secure-1PSIDAdvertisingExpires: 2 yearsSecure first-party variant of the Google account session cookie. When surfaced on a third-party site through a Google embed, it enables Google to identify the visitor across the web for ad and product personalisation.
__Secure-3PSIDAdvertisingExpires: 2 yearsThird-party variant of the Google account session cookie. Enables Google to deliver personalised ads across non-Google sites.
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