Quick, clean, and to the point

Toggle underline formatting

Windows shortcut 
Mac shortcut 

This shortcut toggles underlining on and off for the current selection.

On Windows, Ctrl 4 also toggles underlining.

Related videos

The videos below demonstrate this shortcut.
In this video, we'll look at the shortcuts you can use for find and replace in Excel.
In this lesson, we cover shortcuts you can use to format cells and other objects.

Download 200+ Excel Shortcuts

Get over 200 Excel shortcuts for Windows and Mac in one handy PDF.