BoxCryptor is a FREE for non commercial use, cross platform, cloud encryption utility.https://www.boxcryptor.com/
BoxCryptor secures your data in the cloud – no matter if you use Dropbox, SkyDrive, Google Drive or any other cloud storage provider.
Access your encrypted files on all devices. BoxCryptor is available for Windows, Mac, Android, iPhone and iPad. Also compatible with EncFS-Linux.
Secure your files the quick and easy way. And what is best: BoxCryptor is free for non-commercial use. Download and try it now!
This is encryption end to end for your most important data. You may want to share your password with a trusted friend or family member if the data stored needs to be accessed in the event you can't.