To begin the process go to the official UIDAI portal by visiting https://myaadhaar.uidai.gov.in. This is the only official website authorized by the Government of India to issue and manage Aadhaar services. Avoid using any third-party websites for security reasons. Step 2: Click on Download Aadhaar. UIDAI is mandated to issue an easily verifiable 12 digit random number as Unique Identity - Aadhaar to all Residents of India. UIDAI is mandated to issue an easily verifiable 12 digit random number as Unique Identity - Aadhaar to all Residents of India. Visit the UIDAI website and go to the Download Aadhaar section. Enter your Aadhaar number, Enrolment ID or Virtual ID then authenticate with an OTP sent to your registered mobile number.