Notepad saves a file in .txt format. By using Print to PDF and Save As options, you can save it as PDF and HTML in Windows 11/10.

Windows only: If you're delving into XML programming for the first time, or want to tweak a few software files, Microsoft's XML Notepad 2007 may be the no-nonsense editor you're looking for.

Notepad++ is also open source software, so if you have the technical know-how, you can examine the source code and make whatever changes you want to it, provided you don’t charge for it.