Folder Spark provides you with a simple option for performing full file/folder encryption and locking.

You will be able to quickly safeguard your folders by protecting them with a master password. The process is simple, just choose a password then select your target folder and hit the lock button. It will be locked and not accessible from anywhere the only way to unlock it is through Spark Folder. But if you want a little more security, you can elect to encrypt your files as well. This process is equally simple, but it gives the option to set a unique password for each file that you select for encryption. One nice thing included is a quick path to copy that password to the clipboard and then perhaps you can place your saved file password into a folder and lock them for safe keeping. It also has the option to send the password to an email address.

The UI is simple, clearly marked and aesthetically pleasing. The only thing we noticed during testing was that when there is a long file path, it partially obscures the browse button but the button remains functional. A nice app to lock and encrypt files with a minimal amount of fuss to do so.