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Open a .p7s or .p7m file online

P7S and P7M are digital signatures in PKCS#7 / CAdES format. Drop the file here to see the signer and – if the document is inside the signature – the document itself.

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What are .p7s and .p7m files?

PKCS#7, also known as CMS (Cryptographic Message Syntax), is a widely used binary signature format. A .p7s is usually a detached signature: it holds the signature and the certificate but not the document. A .p7m file wraps the document inside the signature.

A .p7s often shows up as the attachment smime.p7s of a signed e-mail; .p7m is common in Italy, for example. ASiCE Viewer reads the signer's certificate and the signing time from the signature. If the document is inside, you can preview and download it.

P7S / P7M (.p7s)
File extension.p7s, .p7m
StandardPKCS#7 / CMS (RFC 5652), CAdES
StructureBinary ASN.1 (DER) or Base64 (PEM)
Content.p7s – signature; .p7m – signature with the document

How to open a .p7s file

  1. Choose the file

    Drop the file into the box on this page, or press the box and pick a file from your computer, phone or tablet.

  2. Read the documents

    The container is unpacked in your browser. PDF, Word, Excel, image and text files open in the preview straight away.

  3. Check signatures and download

    See each signer's name and signing time, and download the files one by one or all at once.

Opening the file on a computer and on a phone

Windows, macOS and Linux: open asiceviewer.com in a browser and drop the file onto the page. If you need an official validity confirmation, open the same file in the DigiDoc4 client too.

Android: open the page in Chrome and pick the file from Downloads, or install the ASiC-E Viewer app, which also opens files offline.

iPhone and iPad: save the attachment to the Files app, open asiceviewer.com in Safari and choose the file from there.

ASiC-E Viewer app icon

ASiC-E Viewer for Android

Open signed containers on your phone, even offline. See the signature details and export documents to PDF or Word.

  • Works offline
  • .asice · .bdoc · .edoc · .adoc · .p7s
  • Export to PDF and DOCX
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Questions about .p7s files

What is smime.p7s?

It is the digital signature of a signed e-mail. The file does not contain the message, only the signature and the sender's certificate. This page shows whose certificate signed the message.

How do I get the PDF out of a .p7m file?

Drop the .p7m file here. If the signature wraps a PDF, it opens in the preview and you can download it.

Other supported formats