Download OPENSSL for windows/unix.

Unzip the zip file downloaded

go to openssl --> ssl --> bin directory

execute command "OPENSSL"

after that execute this command.


X509 -inform [format of file to be converted either PEM or DER] -in [filename of file to be converted with extention ]
-out [filename of file to be outputted with ext]


eg: x509 -inform DER -in abc.cer -out abc.pem


For converting .pem to .cer or .der


x509 -inform PEM -in abc.pem -out abc.der


x509 -inform PEM -in abc.pem -out abc.cer


If you want OPENSSL windows version i can send through mail


My mail id is srinivasgajul@lgsoftindia.com


Srinivas Gajula