What is the best most effective way to delete my Reddit post history and account.

I have seen people mention programs that they use to go through and delete their entire Reddit history, or edit their posts and replacing the content with a single word, and then deleting their account.

I do not use it like I used to, so I would like to get rid of every digital fingerprint that I can on the site.

Any help or advice would be appreciated!

Is there anything similar to a QR code that works offline?

Say I have a flyer that I want to discreetly distribute and there is no internet.

Is there something like a QR code that contains the data itself and not just a URL?

This way someone with no data plan could scan the icon/code with an app and the unrecognizable bits and bytes from the icon/code would show up on their screen as a .JPEG of a flyer or something.