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Gpg4win vs KGpg: catalog facts
Gpg4win	KGpg
Free Free software, funded by donations and public contracts.	Free Free and open source under the GPL.
Windows	Linux
Kleopatra gives GnuPG a real key manager instead of a command line Integrates with Outlook through GpgOL and with Explorer through GpgEX	Simple interface over GnuPG Shows signatures, trust and expiry at a glance
Windows only OpenPGP key management is genuinely hard, and the concepts do not hide well behind a GUI	Linux only Fewer features than Kleopatra, with no S/MIME support
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.