Gpg4win is the official Windows installer for GnuPG, bundling the Kleopatra certificate manager and GpgOL for Outlook integration. It provides OpenPGP and S/MIME encryption for files and email on Windows.
Gpg4win
Win Open Source Germany
Official website gpg4win.org
Our take
Gpg4win makes the power of GnuPG accessible on Windows through Kleopatra’s point-and-click interface, and it is the only officially sanctioned distribution from the GnuPG project for that platform. The Outlook plugin (GpgOL) brings encrypted email to corporate environments without needing a separate email client. The trade-off is that it is Windows-only, and Kleopatra, while polished, still surfaces the complexity of key management to users who just want to encrypt a file. Good pick for Windows users already in the GnuPG ecosystem or needing Outlook integration.
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GnuPG GnuPG (GNU Privacy Guard) is the free, GPL-licensed implementation of the OpenPGP standard. A command-line tool for Linux, macOS, and Windows, it encrypts and signs files and email, and manages public-key directories.