Having problems opening a P7S file?

We have programs that can open or convert your P7S files.

Opening P7S files

Did your computer fail to open a P7S file? We explain what P7S files are and recommend software that we know can open or convert your P7S files.

What is a P7S file?

Associated with the Secure/Multipurpose Internet Mail Extension (S/MIME) protocols, a P7S file is embedded with services for cryptographic security standards. These are related to the functions of electronic messaging apps for authenticating messages and optimizing electronic data integrity during transmission. Also known as PKCS #7 signature files, these P7S files are also embedded with cryptographic services that enable digital signatures for the non-repudiation of electronic message origins.These .p7s files are not meant to be opened. These are used internally by Microsoft Outlook, AppleMail and other email management applications. It's recommended to leave these P7S files alone, in order for these email tools to continue working properly.

Try a universal file viewer

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

About File Extension P7S

File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

If you have additional information about the P7S file format or software that uses files with the P7S suffix, please do get in touch - we would love hearing from you.