Mask Aadhaar option allows you to mask your Aadhaar number in your downloaded e-Aadhaar. Go to myaadhaar.uidai.gov.in and select the 'Login' option. Click 'Send OTP' after entering your Aadhaar number and captcha code An OTP will be sent to your Aadhaar-linked cellphone number, which you must input in the required form and then click 'Login. Select 'Download Aadhaar' from the 'Services' section. Select the option 'Do you want a masked Aadhaar?' under the 'Review your Demographics Data' section.