AxCrypt

Icedrive

Icedrive is a cloud storage service based in Gibraltar whose signature feature is a virtual drive: instead of syncing a local copy of every file, its desktop software mounts your cloud storage as if it were a physical disk, streaming files on demand with intelligent caching so you don't wait for a full sync before working. A separate portable app and web app cover on-the-go and browser-based access. Paid Pro plans add zero-knowledge, client-side encryption, file versioning (30 to 90 days depending on tier), and collaboration controls like expiring links, download caps, and password-protected shares. The free plan includes 10GB of storage, while Pro tiers range from 2TB to 6TB, and all plans run on ISO 27001-certified, Tier III+ data centers with TLS 1.2/1.3 encrypted transfers.

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.

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.