Does anyone know if Notepad++ can display a vertical line on the right margin to indicated that the text will or will not fit on a printed page? I have looked but I cannot find it. Word wrap does work, but it wraps by my screen width, not by the width of a printed page.
As you said you do not actually want to print it, you may use the Show vertical edge.
You can then specify the vertical line should locate in which column (default should be 100).
(Tested in: Notepad++ v5.7)
I suggest you use to Microsoft Word for typing documents that you want to print.
EDIT: I couldn't find anything that could provide a vertical margin in Notepad++. But as Workaround for text readability, once the text is written select all the text then press Ctrl + I (shortcut for Split Lines). One Disadvantage is that you have to keep your window size steady i.e don't resize it.