cppcryptfs

Want a folder's contents to always sit on disk encrypted, yet open like a normal folder when you use it? cppcryptfs delivers—mount an encrypted virtual drive on Windows where files you write are automatically encrypted to disk. It's a Windows implementation of the gocryptfs format, encrypting each file individually so it's safe to sync to cloud storage. Mounted, it reads/writes normally; unmounted, only ciphertext remains. Free and open source.

Features

Encrypted folder: mount an encrypted virtual drive, files auto-encrypted.

Per-file encryption: each file encrypted separately, safe to cloud-sync.

Transparent: reads/writes like a normal drive when mounted.

gocryptfs-compatible: a Windows implementation of gocryptfs, open source.