It can create a virtual encrypted disk that works just like a regular disk but within a file. It can also encrypt a partition or the entire storage device with pre-boot authentication.
VeraCrypt
veracrypt.fr
Our take
The continuation of TrueCrypt and still the reference tool for full-disk and container encryption, with a real party trick in hidden volumes for plausible deniability. The friction is that it is dense and unforgiving: a forgotten password or a botched system-encryption setup can lock you out for good. Right for people encrypting drives and partitions who will read the documentation; overkill if you only need to protect a few files.
GitHub at a glance
veracrypt/VeraCrypt
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VeraCrypt_1.26.29
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VeraCrypt alternatives
VERNAM A free, fully client-side file encryptor that runs in your browser. Drop in any file, set or generate a passphrase, and it seals the result into its own .vrn format. Nothing is ever uploaded, and it works offline.
PrivacyNotes Zero-knowledge notes, tasks, files, passwords and journal secured by a single 12-word recovery phrase, with no email or password required. The crypto core and database schema are published for audit. No subscription model.
Cryptomator Cryptomator encrypts your data quickly and easily. Afterwards you upload them protected to a cloud service.
LUKS LUKS (Linux Unified Key Setup) is the standard disk-encryption specification for Linux, implemented by the cryptsetup utility. It provides a header format and key-slot system on top of the dm-crypt kernel module, supporting multiple decryption passphrases per volume.
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.
OpenKeychain OpenKeychain is an OpenPGP implementation for Android. It manages your keys and those of your contacts, and integrates with K-9 Mail and FairEmail for end-to-end encrypted email on Android devices.