Be it be a Muslim or Hindu, everyone have a right to marry with a person of one’s own choice and it is an integral part of the right granted under article 21 of the Constitution of India ( right to life and liberty).
Keeping this in consideration, can a Hindu do nikah?
No nikah is possible unless both the spouses profess Muslim religion.
Hereof, how do I convert to marriage in Islam?
Well, if your woman wants to marry you in the Islamic way, you have to convert to Islam. No need to go to Islamic centre to get the certificate. When you visit the Office of Religious Affairs, you can ask the village chief (RT) to issue a letter stating that you are Muslim together with the other required paperwork.