AxCrypt

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AxCrypt is a tool for Android that can be used to open and view files encrypted by the desktop version of the same application. Read more about AxCrypt  

Despite the name of the application, this is not a tool for encrypting files that are stored on the mobile device. AxCrypt is used to open and view encrypted files created with the desktop version of the app.
Users of AxCrypt will have to set up an account with the service since the password will be used to encrypt the files. Powerful encryption protocols are used such as AES-128 or AES-256, and users will be able to share and received encrypted files without having to send the passwords as well.
Technically, all the files that have been created with AxCrypt since 2001 onward should be easy to access and decrypt. Please keep in mind that AxCrypt has a limited number of features in the free version, and users need to pay for a premium subscription if they want access to the full suite of options.