P7S Universal Viewer is an open-source Windows utility for examining .p7s digital-signature files, often used with signed email. Load one or several files to review signature analysis and certificate information. Its Preview section can show raw signature data and available attached images, documents, or PDFs, which can be saved separately. The program can also export a CSV report of loaded files.
| Author: | AlinTibi |
| License: | Open Source |
| Price: | FREE |
| Released: | Oct 9, 2026 |
| File size: | 44.90 MB |
| Downloads: | 51 |
| Keywords: | verify, P7S File Viewer, Verify P7S Signature, p7s file viewer, email signature verification, download P7S Universal Viewer, extract p7s attachments, p7s, p7s certificate viewer, P7S Universal Viewer free download, open p7s files, P7S Universal Viewer, verify p7s signature, Verify Email Signature, certificate, signature |
| Author URL: | https://github.com/AlinTibi/p7s-universal-viewer |
P7S Universal Viewer is a desktop utility for opening and examining .p7s digital-signature files. These files commonly accompany signed email and other documents, carrying signature data used to check whether signed content has changed and to inspect the certificate associated with the signer. The program is intended for people who need to review such files directly rather than rely only on the signature indicators in an email client.
To analyze a file, users load it into the application and review the displayed signature information and verification result. The interface gathers the analysis in one place, making it practical to inspect a signature without working through raw certificate data first. When several files need attention, a batch option can process multiple .p7s files together, which is useful for reviewing a group of signed messages or documents.
The built-in Preview section lets users examine content associated with a signature in the same application. Depending on what the file contains, this can include raw signature data as well as attached images, documents, or PDFs. Previewing helps identify the signed material before extracting it; available content can be saved separately for later use. The program can also export a CSV report for loaded files, providing a tabular record that can be kept or used in another workflow.
P7S Universal Viewer is suited to checking signed email attachments, reviewing certificate and signature information, and extracting content from one or more P7S files. It may also help when an email application does not make the signature or its attached content easy to inspect. A signature result is one part of assessing a message: users should consider the certificate details and the context in which the file was received rather than treat a valid signature alone as proof that a sender is trustworthy.
The application is open source and is available for Windows 10 and Windows 11, with support for both 32-bit and 64-bit Windows 10 systems. Its focused purpose is analysis and preview of P7S files; it does not replace a full email client or general-purpose document editor. The download is approximately 46 MB.