If you have lost or misplaced your Aadhaar Card, follow these process to retrieve it online
The process needs that you have a registered mobile number linked with Aaadhaar
Visit UIDAI link https://myaadhaar.uidai.gov.in/retrieve-eid-uid
Select your requirement - Aadhaar/EID you want to retrieve
Enter your full name as in Aadhaar, mobile number/email linked with Aadhaar
Fill the Captcha code and wait for OTP
After mobile OTP based authentication, the Aadhaar number/EID as per request will be sent through SMS to the linked mobile number
This service is free of cost