File encryption software for files that live in the cloud
Cloud storage encrypts your files on its own servers, but it holds the keys, so the provider, anyone who gets into your account, and anyone the provider is compelled to hand data to can read them. Drive encryption built into Windows protects a laptop that is stolen, not the copies you sync. The usual workaround is to zip sensitive folders with a password by hand before every upload, and to remember to do it again each time something changes.
File and Folder Encryptor is file encryption software that does that step for you, continuously. Choose a folder such as tax returns or ID scans, pick a destination, whether a OneDrive or Dropbox folder, a NAS share or an external drive, and set a backup password. The app writes an encrypted copy of every file into the destination. Each file's name is replaced with a random one, and the list of real names is encrypted too, so a person browsing the cloud folder learns nothing about what is inside.
The main window shows both halves at once: This PC on one side, What OneDrive sees or What Dropbox sees on the other. The seal between them is the Back up now button.
Secure cloud backup that keeps itself current
With Back up when files change on, the app looks at your folders about once a minute while running and seals only files that are new or modified. Turning it off moves to one backup a day while the app is open. A file you delete from the folder is removed from the backup on the next run, so the cloud mirrors the folder as it is now rather than keeping old versions.
To get everything back on a new PC, install the app, choose Restore on another PC, select the backup location and type the backup password. The app keeps no copy of that password anywhere online and has no way to reset it, so write it down somewhere safe.
How to encrypt a file or folder with a password
For a single document or a folder you want to send or store as one sealed file, the drop zone in the main window does it without any backup set up.
- Drop files or folders on Encrypt or decrypt a file or folder, or click Browse.
- Type a password and repeat it under Confirm password. A hint warns when the password is short and easy to guess.
- Click Encrypt. Each item is saved as a new .encrypt file next to the original; a folder is packed and sealed as one file.
- To open one later, drop the .encrypt file on the window and click Open. The file or folder reappears beside it and nothing existing is overwritten.
What zero-knowledge encryption means here
Encryption happens on your PC before anything is written to the destination, and there is no account or server involved. Contents are sealed with XChaCha20-Poly1305, an authenticated cipher, so a tampered file fails to open rather than opening wrong. Your password is turned into the key by Argon2id, which makes guessing passwords slow and expensive.
If you want the unencrypted originals gone after encrypting, switch on Remove the original after encrypting in Settings. The original is only removed after the new .encrypt file has been opened again and checked against it.
