Received a signed .p7m file on your Android phone and it won't open? Android does not natively understand the PKCS#7 signature format, but opening these files is still quick and easy. Here is how to open .p7m files on Android.
Option 1 — the free P7M Viewer app (recommended)
The most comfortable way on Android is the dedicated app:
1. Install P7M Viewer from Google Play.
2. Open the app and tap Choose file, or share a .p7m file to it from email, WhatsApp or your Files app.
3. The original document appears instantly — view it or save it.
The app is built for touch, works offline-friendly for viewing, and lets you share the extracted document anywhere in one tap.
Option 2 — your mobile browser
Prefer not to install anything? The online tool works in Chrome, Samsung Internet or any Android browser:
1. Open the P7M Viewer website.
2. Tap Choose file and pick your .p7m file.
3. View or download the extracted document.
Opening a .p7m file straight from WhatsApp or email
Signed invoices often arrive through WhatsApp or Gmail. Save the attachment to your phone first, then either share it into the P7M Viewer app or upload it on the website. Both methods reveal the document inside.
Why Android shows "cannot open file"
Android looks at the .p7m extension, does not recognise the signature envelope, and refuses to preview it. The file is fine — it just needs an app that removes the signature layer. That is exactly what P7M Viewer does.
Frequently asked questions
Is opening .p7m on Android free? Yes — single files are free in both the app and the website.
Which Android versions are supported? All modern versions of Android.
Can I open XML invoices too? Yes, including double extensions like `.xml.p7m`.
Summary
On Android, the easiest path is the free P7M Viewer app: tap, open, done. If you prefer, the website does the same job in your browser — no installation required.
