Here's a command-line to start the application, please note that this requires Java 11+ and openjfx to be installed. In some future iteration I would like to clean up the installer so it's simpler to run.
You should then be greeted by a window that looks like this.
OK, there's a lot going on here but it's still quite simple:
The left side is the list of passwords, that will be covered in a minute.
The pass phrase field is like your master password for all the other passwords. This should be a value that is hard to guess or socially engineer (yet easy for you to remember).
The password name field is a friendly name for the password being generated. Typically it would be the name of the site or account but you can use whatever naming convention you prefer.
The password field is the generated password. This field is not editable. Use the Copy button to copy password to the clipboard. You can also highlight it and right-click to copy if you prefer.
The four checkboxes determine which character sets will be included in the generated password.
The password length slider determines how long the generated password will be. It only supports multiples of 8 due to a design decision I made early on. I should also fix that if it's a problem. It's kind of bad for sites that have weird restrictions like a maximum of 12 characters. It always terrifies me to use sites that are obviously storing passwords in plain text like that. Like somewhere they have a database column set to VARCHAR(12).
The password notes field does not modify the password. It's where you can put a reminder like "only use the first 12 characters on this insecure site".
The last two checkbox+field combinations are used to clear values after some period of time if that's something you want to do. The first removes the password copied to the clipboard after some number of seconds. The second clears the pass phrase after some number of seconds. Use these or don't, it depends on how likely you think it is that someone has access to your physical computer.
After filling out a pass phrase the password will be generated. This value is not stored by NARPassword and will change when any settings are changed.
The plus and minus buttons can be used to add and remove passwords. The text on the left side list isn't editable. The password name is changeable in the field on the right side.
The save button opens a dialog to save your password list to a file. This does not save your pass phrase or generated passwords. It saves the name and settings. This file can be encrypted with a different password if you choose. This is not required but is a good idea.
The saved password list contains text like this when un-encrypted:
Again, no password or pass phrase in there. On your file system it will be encrypted even if you don't specify a password. However if someone compromised this file it would be trivial to un-encrypt if there wasn't a password. In case you're curious, here's what the previous password list looks like when it's saved with no password: