To reset your Citibank debit card PIN online, log in to your Citibank account via the official website or mobile app. Navigate to the “Service Center” or “Card Services” section. Select the option to change or reset your PIN. Verify your identity through the required security steps, which may include receiving a one-time password (OTP) via SMS or email. Follow the prompts to set a new PIN. If you encounter any issues, Citibank offers expert 24/7 support. Contact customer service for immediate assistance to ensure your request is handled securely and promptly.