Default Encrypted Vault/Safe

Greetings to all!

I have a small question:

I have used Hide It Pro but found out that it only moves the files to an hidden folder.
Vaulty just renames the file extension.

And what about KeepSafe? Does it do the same than the above ones, or it really encrypts the files?

Is there any app that does the same as the above and encrypts those files?