How to generate a .pfx file from a .cer file?

Question

I've only the .cer file now i want to convert it to .pfx file. But when i tried to convert via openssl it is asking for private key file? Is it necessary to have a private key file to generate a .pfx file? if not then could you please suggest the open ssl command to accomplish this. Thanks Sushma.

Pocket

A PFX file is a container for both private and public key. So you cannot make one with any of those keys. CER contains only your public key. What are you accomplishing by your actions? – Reannareap

ThanksRaj for the clarifications, actually i got the .cer file from the client and my requirement is to create the .pfx file, the client had not provided the private key file. – Pocket