P7S File

What are P7S files and how to open them

Are you having problems opening a P7S file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your P7S files.

What is a P7S file?

A .P7S file is a PKCS #7 Signature file.

A P7S file is sent as an attachment to a digitally signed email message and contains the digital signature used to sign the email content.

Normally the attached file is called SMIME.p7s, where SMIME is short for Secure/Multipurpose Internet Mail Extensions. It is a standard used by email clients to handle digitally signed emails. The signature is used to verify the email's sender, to check that the email content has not been altered, and optionally to encrypt the email.

These files are also known as PKCS #7 signature files.

How to open P7S files

Important: Different programs may use files with the P7S file extension for different purposes, so unless you are sure which format your P7S file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different P7S openers which you will find listed below.

Last updated: February 20, 2024

Various apps that use files with this extension

These apps are known to open certain types of P7S files. Remember, different programs may use P7S files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about P7S file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.