GnuPG implements the OpenPGP standard and provides tools to encrypt and sign data and communications, with key management and directory access.
Gpg4win
The free Windows GnuPG distribution provides file and email encryption and certificate management.
About Gpg4win
Gpg4win is the official GnuPG distribution for Windows. It is used for file and email encryption, digital signing, and management of OpenPGP and S/MIME (X.509) certificates. Its certificate manager, Kleopatra, handles both certificate types in one tool.
The source describes Windows use and a Microsoft Outlook plugin. It does not describe other operating systems or email clients. The source also states that Gpg4win is Free Software, that most of its packages are licensed under the GNU GPL, and that its usage is free.
Key features
- Sign and encrypt single files or whole folders from Windows Explorer using GpgEX
- Sign, encrypt, verify and decrypt email in Microsoft Outlook through the GpgOL plugin
- Support for both OpenPGP and S/MIME (X.509) certificates
- Create and verify file checksums with SHA-1, SHA-256 and MD5
- SmartCard support for OpenPGP and S/MIME
- Kleopatra certificate manager with import and export from certificate servers
Best for: Windows users who need file or email encryption with OpenPGP or S/MIME certificates and want a free, open-source tool.
Good for
- Free to use, with most packages licensed under the GNU GPL
- Official GnuPG distribution for Windows
- Uses 2048-bit keys by default and the RSA algorithm for signing and encrypting, per the source
Watch out for
- The source describes only Windows use and does not mention other operating systems
- Email signing and encryption is described for Microsoft Outlook only
Gpg4win at a glance
- Website
- gpg4win.org/features.html
- Type
- Online tool
- Pricing
- Free
- Open source
- Yes
- Last checked
- Oct 9, 2026 · Online when checked
- Listed
- Oct 9, 2026
Gpg4win alternatives
Tools and sites you could use instead, ranked by how closely they match.
Encrypt email and files on Windows with Gpg4win, a software package based on GnuPG.
Tuta offers encrypted email, calendar, and contacts, with apps that the site says protect personal data using end-to-end encryption.
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Gpg4win FAQ
Is Gpg4win free to use?
Yes. The source states that Gpg4win is Free Software, that most of its packages are licensed under the GNU GPL, and that its usage is free.
Is Gpg4win available in German?
All Gpg4win dialogs are available in English and German, and the Gpg4win Compendium is available in both languages. The installer provides some additional languages.
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