Information about the .pfx (pfx) file type

This is one of two possibilities that we have on file for the .pfx file extension, follow this link to view both possibilities.

Below is all the information we have available on file about the .pfx (pfx) file type.

Personal Information Exchange file. This file contains public and private key information used to securely sign, encrypt or authenticate something. Typically used as a means of creating certificates to authenticate websites, applications or encrypted file systems.

A .pfx file contains two certificates, a personal or site certificate and a signer certificate. The personal certificate, which is also known as a site certificate, contains both a public and a private key. The signer certificate (or CA certificate) contains a public key used to authenticate the signing authority, i.e. the authority which is vouching for the validity of the certificate.

On a computer running Windows, a .pfx file (and accompanying public file recovery certificate .cer file) can be created using the cipher command line tool. The syntax for generating a new pair of .cer and .pfx files:

cipher /r:file-name

This will generate two files: file-name.pfx and file-name.cer.

A .pfx file can also be created using IIS, which allows an existing certificate to be exported.

The following links provide further information related to the .pfx file extension:

Where this is available we would like to include file format information on .pfx files, as well as information on how to view or open files of type .pfx. If you know of any information which we have missed then please let us know.