To reset your Citibank debit card PIN online, log in to your Citibank account via the official website or mobile app. Navigate to the section where card services are managed and locate the option for PIN management or reset. Follow the prompts to verify your identity, which may involve entering your card details, CVV, and other personal information. Once verified, you’ll be able to reset your PIN securely online. Alternatively, you can contact Citibank’s customer service for assistance in resetting your debit card PIN if you encounter any issues during the online process.