"If you use only one of Notepad++'s 2 frames (views) at a time, you use this hack:
Make the splitter between the frames vertical (if horizontal, right-click on the splitter and select Rotate to Left). Right-click the tab of the file you wish to edit and select Clone to other view. Click the view you wish to make the minimap and do Ctrl + Mousewheel-down until the font size is as small as possible/desired. Check View > Synchronize Vertical Scrolling and optionally View > Synchronize Horizontal Scrolling.
Now scrolling either the ""minimap"" or normal view scrolls the other. Sadly, text selections are not replicated."