If you use Gemini without signing in to a Google Account, your conversation data may still be retained by Google for up to 72 hours.
Users who believe that using Gemini without an account makes their conversations anonymous or unretained are mistaken — Google still holds this data for three days, during which it may be reviewed or processed.
Retention of data from unauthenticated users raises questions under GDPR's lawful basis requirements, as no account relationship exists to ground a contractual basis, and legitimate interest assessments must account for user expectations of anonymity. This is particularly relevant for EU/UK regulatory review.
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Your conversations with Gemini, including any personal or sensitive information you share, may be reviewed by Google employees and used to train AI models. Chat history is retained for up to 18 months by default, and Google may use this data across its broader ecosystem of services. You can delete your Gemini conversation history by visiting myactivity.google.com and disabling or clearing Gemini Apps Activity.