#17 in Secrets & Key ManagementUpdated 2026-08

GnuPG

by GnuPG · Free OpenPGP encryption and signing from the command line

9.5 — BenchRank score out of 100

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Overview

GnuPG is an implementation of the OpenPGP standard (RFC4880) for encrypting and signing data and communications. It is a command line tool with a key management system and access modules for public key directories, and it is intended to be integrated with other applications via frontends and libraries. It also supports S/MIME and Secure Shell (ssh).

Best for: People and developers who need to encrypt and sign email, files and data using the OpenPGP standard.
Pricing: No prices are shown; GnuPG is Free Software that can be used, modified and distributed under the GNU General Public License.
Runs on: Windows

Strengths and trade-offs

Strengths

Complete OpenPGP (RFC4880) implementation, free under the GPL
Command line design suits integration with other applications
Also covers S/MIME and Secure Shell (ssh)
Gpg4win adds a Windows crypto manager and Outlook plugin

Trade-offs

Command line first; usable GUIs come from separate frontends or Gpg4win
Frequent releases and security advisories mean regular updating is required
Branches age out fast: the 2.4 series was given six months to end-of-life

How this score is made up

Each dimension is scored out of 100 and combined into the headline score using fixed weights.

MCP support: 0 out of 100
API quality: 0 out of 100
Documentation: 0 out of 100
Agent friendliness: 35 out of 100
Changelog: 0 out of 100
Marketing site structure: 45 out of 100
Operational trust: 0 out of 100

Measured, but not part of the score

Useful to know, but not a mark for or against the product — so these do not affect the ranking.

Openness: 0 out of 100

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