If you are looking for Bangladesh Government portal for NID Registration (National identify card registration), you can apply online. You need your valid birth certificate and registered mobile number and email address for security verification.
Voter ID (photo ID) registration documents: You need your father and mother’s name, NID for registration. If you have any brother or Sister or wife/husband available, you need their valid NID number during registration. Once registration done, you need to wait for approval.