P7S Universal Viewer download

P7S Universal Viewer v2.0.0 by ALMARFELD opens CMS/PKCS#7 containers, verifies each signature and extracts embedded content byte-for-byte. Detached signatures require the exact original file.

Free and MIT-licensed for Windows 10/11 x64. Install the EXE, or extract the whole portable ZIP and run P7SUniversalViewer.exe. No separate .NET runtime is needed. WebView2 is optional for PDF preview; it is not installed automatically.

Local processing, no uploads or telemetry. Integrity, certificate trust and dates are separate. Revocation and trusted timestamps are not verified. Integrity does not establish legal validity or file safety.

Binaries are not Authenticode signed. Compare SHA-256 with the supplied checksums; do not disable Windows security. SourceForge mirrors v2.0.0; v1 files remain historical.

Product and verification: https://almarfeld.com/software/p7s-universal-viewer/
Source: https://github.com/AlinTibi/p7s-universal-viewer

Features

Open attached CMS/PKCS#7 P7S and P7M containers on Windows
Verify each signature separately from certificate trust and dates
Extract original embedded content without changing its bytes
Verify detached signatures using the exact original file
Local processing; free and open source under MIT

Project Samples

P7S Universal Viewer v2.0.0 — synthetic attached content and independently checked signers

Legacy v1 main window — retained for historical reference

Legacy v1 screenshot — retained for historical reference

P7S Universal Viewer v2.0.0 — detached signature requires the exact original file (synthetic example)

P7S Universal Viewer v2.0.0 — altered content fails signature integrity verification (synthetic example)

Project Activity

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License

MIT License

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P7S Universal Viewer Web Site

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Additional Project Details

Operating Systems

Windows

Registered

2026-03-27

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