Updated: 09/03/2019 by Computer Hope

Alternatively referred to as Control U and C-u, Ctrl+U is a shortcut key most often used to underline text.


On Apple computers, the shortcut for underline may be Command key+U keys.

How to use the Ctrl+U shortcut key

To use the keyboard shortcut Ctrl+U press and hold either Ctrl key on the keyboard and while continuing to hold, press the "U" key.


On Apple computer keyboards, the Ctrl key is labeled as "control."

Ctrl+U in an Internet browser

In Chrome, Edge, Firefox, and Opera, pressing Ctrl+U opens the source code for the page being viewed. For example, you could press Ctrl+U to view the source code of this page.

In Internet Explorer, Ctrl+U opens the Debugger.

Ctrl+U in Excel and other spreadsheet programs

In Microsoft Excel and other spreadsheet programs, pressing Ctrl+U when one or more cells is selected will underline or remove the underline on the selected cells. If editing the contents of a cell with no selected text, Ctrl+U turns on and off underline for all contents of the cell.


If you're editing the contents of a cell and press Ctrl+U, nothing will happen.

Ctrl+U in Microsoft PowerPoint

In Microsoft PowerPoint, the Ctrl+U shortcut key underlines any selected text.

Ctrl+U in Outlook

In Microsoft Outlook, pressing Ctrl+U marks a selected read e-mail as un-read.


Use the shortcut Ctrl+Q to mark a selected e-mail as read.

Ctrl+U in Word and other word processors

In Microsoft Word and other word processor programs, highlighting text and pressing Ctrl+U adds an underline below the text. If the text is already underlined, highlighting the text and pressing Ctrl+U removes the underline.

Ctrl, Keyboard terms, Shortcut key, Underline