Install Notepad++ and NppCrypt plug-in
Step 1: Download and install Notepad++.
Step 2: Launch the plug-in manager by going to Plugins > Plugin Manager > Show Plugin Manager.
Step 3: Select NppCrypt from the plug-in list, then click the Install button. Allow Notepad++ to restart after the NppCrypt finishes installing.
(Credit: Screenshot by Ed Rhee/CNET)
Encrypt text
Step 1: To encrypt selected text, select the text you want to encrypt, then go to Plugins > NppCrypt > Encrypt.
Step 2: Select the cipher you want to use, then type in a password.
(Credit: Screenshot by Ed Rhee/CNET)
To encrypt the entire file, just go to NppCrypt without selecting any text and choose Encrypt. To decrypt text, go back to NppCrypt and choose the Decrypt option.
(Credit: Screenshot by Ed Rhee/CNET)
That's it. Now you can encrypt select data in a text file or the entire file with ease, using Notepad++ and NppCrypt.