GnuPG is described as 'allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications' and is a well-known app in the Security & Privacy category. There are more than 25 alternatives to GnuPG for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is GPG4Win, which is both free and Open Source. Other great apps like GnuPG are Enigmail (Free, Open Source), AES Crypt (Free, Open Source), Encrypto (Free) and Kleopatra (Free, Open Source).
Gpg4win enables users to securely transport emails and files with the help of encryption and digital signatures. Encryption protects the contents against an unwanted party reading it. Digital signatures make sure that it was not modified and comes from a specific sender.
Most users think GPG4Win is a great alternative to GnuPG.
AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for encrypting files using the Advanced Encryption Standard (AES).
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Some users think AES Crypt is a great alternative to GnuPG, some don't.
Encrypto lets you encrypt files before sending them to friends or coworkers. Just drop a file into Encrypto, set a password, and then send it however you normally would — but this time with added security. It’s free for both Mac and Windows.
AxCrypt is a simple file encryption software for Windows. It integrates seamlessly with your workflow to encrypt, decrypt, store, send and work with files.
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Axcrypt vs GnuPG opinions
This alternative is disputed. Axcrypt is still a legitimate alternative to GnuPG, but it might have issues that some users think are important.
As far as I see, Axcrypt is a file encryptor. But GnuPG (and PGP generally) is targeted mostly for email body encryption and signing: not only files and not only encryption. Also, Axcrypt is for Windows only.
Password-encryption of files and folders. The program is written in Java and therefore platform-independent and runs on nearly every system without installation, but requires a Java Runtime Environment - that is already installed in most cases.
It offers an automatic and easy to use solution with end-to-end protection for all written digital communications over the Internet. It have been designed to provide extremely easy and automatic encryption by default for e-mail.
OpenPGP is the most widely used email encryption standard. It is defined by the OpenPGP Working Group of the Internet Engineering Task Force (IETF) as a Proposed Standard in RFC 4880. OpenPGP was originally derived from the .