How do you get birth certificate online?

Birth certificates are usually issued by the state in which you or another person is born. You can contact the state's clerk of court or the Bureau of Vital Statistics to acquire a certified copy of your own certificate. Even though it is a replacement birth certificate, it would still be an original certified copy.

In order to obtain a copy, you must turn in an application that includes your full name, you parents' full names, the date and location of birth, and the purpose of your search. You must also send them a copy of your legal identification which should be updated and current.

Another view:

In many jurisdictions, it is the city or county of your birth who records such statistics and maintains those records. You should first try contacting your County Dept. of Health, or Bureau of Vital Statistics, or similar office, to determine if they are the office with which you should be dealing.

You cannot actually get a "new" birth certificate through this process - you can only get a copy of your original birth certificate.