Best Open-Source Encryption Software 2026: 7 Options Compared

Encryption tools differ mainly in what they protect: a whole disk, a container of files, individual files, or messages. Whole-disk encryption on Linux uses cryptsetup with LUKS, which guards a drive if the machine is lost or stolen. VeraCrypt creates encrypted containers or encrypts partitions and works across Windows, macOS and Linux. gocryptfs and Cryptomator encrypt a folder file by file, which makes them a good match for cloud sync, since only changed files need uploading. Picocrypt is a small tool for encrypting single files with a simple interface, and age is a minimal command-line tool for the same job aimed at scripts. GnuPG is the long-standing standard for encrypting files and email to other people using public keys. The trade-off to understand is that strong encryption has no recovery path: lose the password or key and the data is gone, so keep a secure backup of keys and test decryption before you rely on it. Pick by threat. For a stolen laptop, use full-disk encryption. For files in Dropbox or Google Drive, use a per-file tool so the provider only sees ciphertext. To send something to a specific person, use public-key tools like GnuPG or age. Prefer well-reviewed, open-source tools, since a closed encryption tool asks you to trust its claims without checking.

VeraCrypt

Free open-source tool for encrypted containers and full partitions across major desktop systems. Its home page does not name the licence, so check the repository terms.

Price: Free (Free open source) (VeraCrypt pricing, checked 2026-10-23).

Platforms and license: Windows, macOS, Linux, FreeBSD. Free open source (license not named on the home page) (open source) (license source).

Best for: Cross-platform encrypted containers.

Worth knowing: Based on TrueCrypt 7.1a. Encrypts file containers, partitions, USB drives and the Windows system partition; hidden volumes supported.

Compare: VeraCrypt alternatives

Cryptomator

GPLv3 tool that encrypts folders before they sync to cloud storage. Desktop apps are free; mobile apps are read-only unless you pay 29.99 one-time.

Price: Free (Desktop apps free; mobile apps free but read-only); paid from EUR 29.99 per one-time, mobile full access (shown for Germany; sale price EUR 19.99) (Cryptomator pricing, checked 2026-10-23).

Platforms and license: Windows, macOS, Linux, Android, iOS. GPLv3 (commercial license for resellers) (open source) (license source).

Project activity: 16.4k GitHub stars · latest release 1.19.4 (Oct 21, 2026) · last commit Oct 27, 2026

Best for: Encrypting files before cloud sync.

cryptsetup (LUKS)

GPL-2.0-or-later tool for LUKS full-disk encryption on Linux. Command line and powerful; the standard way to encrypt a Linux drive.

Price: Free (Free open source) (cryptsetup (LUKS) pricing, checked 2026-10-23).

Platforms and license: Linux. GPL-2.0-or-later (open source) (license source).

Best for: Full-disk encryption on Linux.

gocryptfs

MIT encrypted overlay file system for Linux that encrypts files individually. A lightweight option for protecting a folder.

Price: Free (Free open source) (gocryptfs pricing, checked 2026-10-23).

Platforms and license: Linux, macOS. MIT (open source) (license source).

Project activity: 4.7k GitHub stars · latest release v2.6.1 (Aug 10, 2025) · last commit Oct 22, 2026

Best for: Linux folders and cloud sync.

Worth knowing: Encrypted overlay filesystem built on FUSE. macOS support is beta quality; Windows is not supported (cppcryptfs is the separate option).

Picocrypt

GPL-3.0-only tool that encrypts a single file with a simple interface. Small and easy to audit, but one file at a time.

Price: Free (Free open source) (Picocrypt pricing, checked 2026-10-23).

Platforms and license: Windows, macOS, Linux. GPL-3.0-only (open source) (license source).

Project activity: 1.5k GitHub stars · latest release 1.49 (Aug 4, 2025) · Archived on GitHub

Best for: Quickly encrypting single files.

Worth knowing: File encryption (XChaCha20, Argon2id). The repository is archived and read-only; the maintainer says it still works. macOS build is Apple silicon only.

GnuPG

Standard GPL tool for encrypting and signing files and email with public keys. Powerful but has a learning curve.

Price: Free (Free software since 1997) (GnuPG pricing, checked 2026-10-24).

Platforms and license: Linux, Windows (Gpg4win), macOS. GNU GPL (open source) (license source).

Best for: Encrypting for other people.

age

BSD-3-Clause minimal file-encryption tool with a small command-line interface. Simpler than GnuPG for scripts and backups.

Price: Free (Free and open source) (age pricing, checked 2026-10-24).

Platforms and license: Windows, Linux, macOS, FreeBSD, OpenBSD. BSD-3-Clause (open source) (license source).

Project activity: 24.1k GitHub stars · latest release v1.3.2 (Aug 29, 2026) · last commit Aug 29, 2026

Best for: Simple scripted file encryption.

Which one to pick

• You want to protect a stolen laptop: cryptsetup (LUKS)
• You keep files in cloud storage: Cryptomator
• You want an encrypted container on Windows and Mac: VeraCrypt
• You must send a file to one person: GnuPG