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Comparison · Office and email

P7M viewers compared (2026): open a .p7m file, read the invoice, or check the signature

By Blink Brief · Updated  · How pages are made

To open a .p7m file you don't need to pay or install anything: AprireFileP7M.it and the Blink Brief P7M viewer take the document out in your browser for free, and InfoCert Sign's FREE licence and Aruba Sign do it on your computer. To check that the signature is legally valid, use InfoCert Sign, Aruba Sign, or an online verifier from InfoCert or Poste Italiane, which receive the file on their servers. Most of these tools have Italian pages only. All ten were checked on their own pages on 4 November 2026.

Short answer

  • Just open it, free, no upload: AprireFileP7M.it or the Blink Brief P7M viewer in the browser; the P7M Viewer app on an iPhone.
  • Check the signature: InfoCert Sign (FREE licence, English page) or Aruba Sign on your computer.
  • Check it online: InfoCert's online verification or Poste's Verificatore On Line; both receive the file.
  • An Italian e-invoice: AprireFileP7M.it or 2pdf.it make a PDF in Italian; the Blink Brief viewer shows it with English labels.
On this page

Quick picks

  • Check the signature

    InfoCert Sign

    Verifies .p7m and .pdf signatures with the FREE licence, as a program for Windows and macOS or a phone app.

    FREE licence

    infocert.digital

  • Open in the browser

    AprireFileP7M.it

    Takes the document out of a .p7m and shows an .xml.p7m invoice, without registration or upload. Italian page.

    Free

    aprirefilep7m.it

  • iPhone and iPad

    P7M Viewer app

    Opens .p7m files from Mail, Files or Safari, shows the signers, and exports or prints the document. In English.

    Free, with in-app purchases

    apps.apple.com

Price, language, and whether the file is uploaded

Tool Price Page language Does the file go to a server?
InfoCert Sign English page: FREE; PRO €49 + VAT a year, first 30 days free; Business €249 + VAT a year. The Italian page lists Essential €6.90, Pro €49.00 and Business €99.90 (on promotion, was €149.00), + VAT a year English and Italian Not stated. Desktop program for Windows and macOS, phone apps, and a web version
InfoCert online verification Not stated Italian Yes: "Carica un documento firmato o marcato" (upload a signed or timestamped document)
Aruba Sign Not stated; the download page needs no login Italian (the English page returns 404) Not stated. Program for Windows, Mac and Linux
Poste Verificatore On Line Not stated Italian Yes, the form sends the file to Poste's server
EU DSS demo Not stated; "a demonstration", for "testing purposes only" English Yes: files "are going to be transmitted to the infrastructure of the European Commission"; "not retained"
p7m.io (DocKit Web) Free to open, verify and preview the first page. Downloading the document: €3.99 each, Pro €15.99 a year, or Lifetime €24.99 once (was €39.99) Italian (English addresses return 404) No, per the site: "Nessun file viene caricato su server esterni"
AprireFileP7M.it Free, "senza registrazione" (no registration) Italian (the English page returns 404) No, per the site: the file "non viene caricato né conservato sui server"
2pdf.it Free: "completamente gratuito" Italian Yes; files are "immediatamente eliminati" after processing; servers in Germany per its privacy policy
P7M Viewer (iPhone, iPad) Free, with in-app purchases; ads unless removed English, and 3 more Not stated; an app on your device
Fatture e Corrispettivi Free, from Italy's tax agency Italian: "Online services are available in Italian only" Nothing to upload: invoices that passed through the SdI are already there. For Italian VAT-number holders, with SPID, CIE, CNS or Fisconline/Entratel

Checked on 4 November 2026 on each vendor's own page, linked in the first column. Where a vendor has no English page, its Italian page is quoted.

Signature check, readable invoice, and several files

Tool Checks the signature Readable invoice or PDF Several files at once
InfoCert Sign Yes, FREE included: "Verify single or parallel signatures in .p7m or .pdf formats" An invoice view isn't stated PRO and Business only: "verification of multiple files or folders"
InfoCert online verification Yes, with a report to download Not stated Not stated
Aruba Sign Yes: integrity, a trusted certificate, and a qualified certificate with legal value Not stated Yes: "Verifica uno o più file firmati" (verify one or more signed files)
Poste Verificatore On Line Yes Not stated No, one file per check
EU DSS demo Yes, with simple, detailed and ETSI reports No One signed file per check
p7m.io The site says it verifies the CAdES signature Reads XML e-invoices; downloading the document is paid No, one file per pick
AprireFileP7M.it No: it "non sostituisce una verifica ufficiale completa di certificato, catena di certificazione e stato di revoca" Yes; downloads the XML, a PDF or the original document No, one file per pick
2pdf.it Not stated; extraction needs a signature from a CA recognised by AgID Yes: an invoice becomes a PDF in a "formato standard compatto" No, one file per pick
P7M Viewer app Shows the signers; uses the EU member states' certificate lists Exports or prints the document; an invoice view isn't stated Not stated
Fatture e Corrispettivi Not a feature of the portal A consultation service for invoices and receipts Not stated on the page read

Read on each vendor's own page on 4 November 2026. "One file per pick" means the page's file picker takes a single file.

Opening a file and verifying it are different

Opening means taking the document out of the signed envelope. Verifying means checking the signer's certificate: that the document wasn't changed after signing, that the certificate comes from a trusted provider, and that it is a qualified certificate with legal value, the three checks Aruba Sign lists. A browser viewer that shows the signer's name has only read it from the file.

An attachment named smime.p7m is a signed or encrypted email, not an Italian document. A signed one can be opened like any .p7m; an encrypted one opens only in the recipient's email program.

Our product

The free Blink Brief P7M viewer opens .p7m files in your browser, several at once, without uploading them or signing up. It gives back the original PDF or XML, shows an Italian e-invoice with English labels to print or save as PDF, and shows who signed and when. It doesn't check whether the signature is legally valid or the certificate revoked, and it doesn't open ZIP archives.

Open the P7M viewer

Questions

How can I open a P7M file for free?

Use a free online viewer that reads the file in your browser, such as AprireFileP7M.it or the Blink Brief P7M viewer, or install InfoCert Sign (its FREE licence) or Aruba Sign. p7m.io shows the document free but charges €3.99 to download it.

Is there an English P7M viewer?

Yes. InfoCert's infocert-sign has an English page and app, the P7M Viewer iPhone app is in English, the European Commission's DSS demo is in English, and the Blink Brief P7M viewer shows Italian e-invoices with English labels. Aruba, Poste, p7m.io, AprireFileP7M.it and 2pdf.it have Italian pages only.

Which P7M viewers upload my file?

Poste's Verificatore On Line, InfoCert's online verification, 2pdf.it and the European Commission's DSS demo receive the file on their servers. AprireFileP7M.it, p7m.io and the Blink Brief viewer say the file is read in your browser; InfoCert Sign, Aruba Sign and the P7M Viewer app run on your device.

How do I check that a P7M signature is valid?

Use a verifier that checks the certificate against the trusted lists: InfoCert Sign or Aruba Sign on your computer, or the online verifiers of InfoCert and Poste, which take an upload. Opening the file alone doesn't check the signature.

Sources

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