The app limits the maximum size of files that can be encrypted. The limit is greater than or equal to 20 Mbytes, except on most mobile devices, where it is 10 Mbytes. The encrypted files are about 1.8 times as large as the originals. The reason for this is that they are JSON text files with large Base64 encoded elements.
For an introduction to using the app, see the Safe Crypt App guided tour.
This app is a derivative work of the Encryption App created by Mark Angelov and published by the TutorialZine under their own permissive license. The current app employs the browser's native Web Cryptography API through a slightly modified version of Dan Davis' wrapper aes4js, licensed under the MIT License (Expat). The app uses the jQuery library, also licensed under the MIT License (Expat). The current author is responsible for the modified code, and it is licensed in its current form under the GNU General Public License Version 3.