Demat accounts are very similar to other bank accounts, except that this account is used to hold securities and other financial instruments. Procedures to open this account online is pretty much same across various firms and institutions.
Here is the list of documents required for opening a Demat account:
A. Proof of Identity (POI):
PAN card/Aadhaar/ Passport/ Voter ID card/ driving license)
B. Proof of Address (POA):
Passport/Voters Identity Card/Ration Card/Registered Lease or Sale Agreement of Residence/Driving License/Flat Maintenance bill/Insurance