Cryptomator

Nowadays most cloud-based solutions are very reliable and almost bulletproof-safe, but if you were to follow to old and wise saying, then you can really "never be too careful," especially when it comes to protecting your privacy.
Cryptomator is a useful and efficient piece of software that is designed to bring a bit extra security to your cloud-stored files by providing a quick way to encrypt them.

Novice-accessible app for protecting your cloud-stored data

In a few words, you can use Cryptomator to create vaults in your Dropbox, Google Drive or any other cloud-based storage system you desire and that is not all, as it also works locally.
In principle, working with this utility is easy enough even for the most inexperienced users out there, mainly thanks to a simplified workflow but also to a distractions-free user interface.
Just create a new vault by selecting its path, assign a passphrase or password and that is about it: no need for accounts, secure keys, cipher configuration, cloud access grants or other complicated processes.

Keep your cloud-stored data protected with the help of this useful app

This is a good time to point out that you files are thoroughly encrypted by Cryptomator with the aid of classic AES algorithm and that you key, passwords and passphrases are protected against bruteforcing attempts.
What is more, you should not fret about the sync process since the app encrypts each file individually, meaning that only the files with modifications will be uploaded to the cloud.
Least but not least, you should know that Cryptomantor can also be used on other popular operating systems out there such as OS X and Linux and even comes with a counterpart app for iOS, with plans for Android also.

Unobtrusive app for cloud storage encryption that also works locally

As a final note, there is no denying that Cryptomator is a handy and slick tool for cloud storage encryption.
What is really great about this utility, besides the fact that it adds a layer of protection for your cloud files, is the fact it also is platform-independent and especially suited for users with lesser computer experience.