I am using Windows and have been given a .cer file. Where can i see what information i have?

Best Answer

OpenSSL will allow you to look at it if it is installed on your system, using the OpenSSL x509 tool .

openssl x509 -in cerfile.cer -noout -text

The format of the .CER file might require that you specify a different encoding format to be explicitly called out.

openssl x509 -inform pem -in cerfile.cer -noout -text


openssl x509 -inform der -in cerfile.cer -noout -text

On Windows systems you can right click the .cer file and select Open. You can then see most of the meta data

On Windows you run Windows certificate manager program using certmgr.msc command in the run window. You then import your certificates and see the details