If you need to open a .p7m file and don't know how, you're in the right place. In this complete guide we will see all the ways to open a .p7m file — online, on a computer and on a smartphone — to read the signed document in a few seconds, for free and without installing programs.
What is a .p7m file
A .p7m file is a document (PDF, XML, Word, image) enclosed in a digital signature envelope in PKCS#7 / CAdES format. The signature serves to guarantee who created the document and that it has not been modified. This is why the computer doesn't open it on its own: it sees the signed envelope, not the document inside.
Opening a .p7m file therefore means extracting the original document from the envelope.
Open a .p7m file online (the easiest method)
The quickest way doesn't require any programs and works on any device:
1. Open the Open .p7m tool of P7M Viewer.
2. Drag the .p7m file onto the page, or tap Choose File.
3. View the document or download it in its original format.
No installations, no Java, no accounts. Plus, the file is not uploaded to any server - processing happens in your browser.
Open a .p7m file on Windows
On Windows 10 and 11 there is no need to install signature software: open the .p7m file in your browser (Edge, Chrome or Firefox) with the tool above. To have it in PDF, after opening use Ctrl + P → Microsoft Print to PDF.
Open a .p7m file on Mac
Even on Mac (Apple Silicon or Intel) the browser is enough: load the .p7m file on P7M Viewer from Safari, Chrome or Firefox. To save it as PDF use ⌘ + P → Save as PDF.
Open a .p7m file on Android
On Android you have two options:
- Free P7M Viewer App: Install from Google Play and open or share .p7m files with one tap.
- Browser: use the site from Chrome or Samsung Internet.
Open a .p7m file on iPhone
On iPhone and iPad, open the site with Safari, tap Choose File, choose the .p7m from File or iCloud and read the document. No app needed.
Open a .p7m file received via PEC or email
.p7m files often arrive as PEC attachments (Aruba, Legalmail, Poste, TIM...) or via email. Save the attachment to your device first, then open it with P7M Viewer. The PEC guarantees delivery; the .p7m signature guarantees the authorship and integrity of the document.
Open a .p7m electronic invoice
Many .p7m files are electronic invoices in `.xml.p7m` format. P7M Viewer recognizes them and shows them in the form of readable invoice - with transferor, transferee, taxable amount, VAT and total - not as an XML code.
Open a .p7m without software (Dike, GoSign, ArubaSign)
To read a document you don't need programs like Dike, GoSign or ArubaSign: those software are mainly used for signing. To open and read a received file, all you need is a browser with P7M Viewer.
Double extension and multiple signature
Often the files are called `documento.pdf.p7m` or `fattura.xml.p7m`: inside there is the actual document, then signed. If a file is signed multiple times (`.p7m.p7m`), P7M Viewer removes all signature envelopes and still returns the original document.
Save the .p7m file to PDF
After opening the file: if there is already a PDF inside, you download it directly; if it is an XML invoice or text, use your browser's Print → Save as PDF function to get a neat PDF.
Mistakes to avoid
- Do not rename the file from .p7m to .pdf: the signature envelope remains and the file may become corrupted.
- Save the attachment before opening it (do not open it from the email preview).
- You don't need Java or heavy software to read the document.
Security: the file remains on your device
With P7M Viewer the document does not leave your device: the processing is in the browser. For invoices, contracts and confidential documents it is the safest solution.
Frequently asked questions
How do I open a free .p7m file? With P7M Viewer, in the browser, free for a single file.
Do you need a program to open .p7m files? No, all you need is a browser to read them; on Android there is also a free app.
Why doesn't the .p7m file open on its own? Because it is digitally signed: the system sees the envelope, not the document. It must be extracted.
Can I open a .p7m from my phone? Yes, on Android and iPhone, in seconds.
Is my file uploaded online? No, it stays on your device and is not sent to any server.
Can I convert the .p7m to PDF? Yes: open the file and, if necessary, use "Print → Save as PDF".
In summary
Opening a .p7m file is simple: upload the file to P7M Viewer and get the original document in seconds. It works on Windows, Mac, Android and iPhone, is free for a single file, requires no software and keeps the document on your device.