You may choose to open through the offline mode only under following scenarios :

1)  If you don't hold a Aadhaar Card or if your mobile number is not registered in Aadhaar database

2)  If you want to open a Joint Account

3)  If you want to open a Corporate Account

4)  If you want to open a HUF Account 

The account opening process in scenario 1,  will be semi - online. Check below the account opening flow:

In case of scenarios 2, 3 and 4 listed above, the account opening has to be completing in the traditional mode where the KYC forms will be emailed so that you can fill, sign and post them back to us.