BestCrypt Container Encryption

Cryptomator

Cryptomator is free, open-source software that creates password-protected encrypted 'vaults' on your device, encrypting both file contents and filenames with AES-256 before anything reaches a cloud provider. It works transparently with virtually any cloud storage service, including Dropbox, Google Drive, OneDrive, and iCloud, mounting the vault as a virtual drive so encrypted files behave like a normal folder. Because encryption happens entirely on the local device, the cloud provider only ever stores unreadable ciphertext. The desktop client is free and donation-supported, mobile apps carry a small one-time purchase, and Cryptomator Hub offers GDPR-compliant, centrally managed vault access for small teams.

Cryptainer

Cryptainer, made by Cypherix, is on-the-fly disk encryption software for Windows that creates virtual encrypted drives protected with 256-bit AES or 448-bit Blowfish encryption, letting users drag and drop files into a secure volume just like a normal disk. It supports encryption volumes from 1MB up to 10TB, works with any file type, and integrates directly into Windows Explorer, making it a lightweight option for individuals and small businesses who need local file and folder encryption without a subscription.

NordLocker

NordLocker provides end-to-end encrypted cloud storage using AES-256, xChaCha20-Poly1305, and Ed25519 algorithms, built on a zero-knowledge architecture so the company itself cannot access stored files. It functions as both a local encrypted vault and a syncing cloud drive, letting users secure files locally and back them up to the cloud simultaneously.

CryFS

CryFS is a free, open-source cryptographic filesystem that encrypts files locally before they are synced to cloud storage providers like Dropbox, Google Drive, iCloud, or OneDrive. Unlike tools that only encrypt file contents, CryFS also hides file sizes, file names, and the directory structure itself, so a compromised cloud provider cannot infer what is stored.

VeraCrypt

VeraCrypt is a free, open-source disk encryption utility developed by IDRIX and based on the original TrueCrypt 7.1a codebase. It lets users create encrypted virtual disks (containers) that mount as real drives, encrypt entire partitions or storage devices such as USB drives, and even encrypt the system partition with pre-boot authentication, all using AES, Serpent, and Twofish ciphers individually or cascaded together. VeraCrypt strengthens TrueCrypt's original design by using far more key-derivation iterations (200,000 for system partitions versus TrueCrypt's 1,000), making brute-force attacks significantly harder, and it adds hidden volumes and hidden operating systems for plausible deniability. It runs on Windows, macOS, and Linux, and the source code is fully auditable, making it a favorite among security researchers and privacy-conscious users who need local, offline encryption without any cloud dependency.