Updated: 10/07/2019 by Computer Hope

Alternatively referred to as Control 1 and C-1, Ctrl+1 is a shortcut key most often used to switch to the first tab in a browser or other programs with tab support.

How to use the Ctrl+1 shortcut key

To use the keyboard shortcut Ctrl+1, press and hold either Ctrl key on the keyboard and while continuing to hold, press the "1" key with the same hand or the other hand.


The "1" used with this shortcut is the "1" at the top of the keyboard and not on the numeric keypad.

Ctrl+1 in Microsoft Excel

In Microsoft Excel and all other spreadsheet programs, pressing Ctrl+1 opens the Format Cells window.

Using Ctrl+1 in an Internet browser

With all major Internet browsers (e.g., Chrome, Edge, Firefox), pressing Ctrl+1 switches to the first tab.


If you only have one tab open, pressing Ctrl+1 appears to do nothing.

Ctrl+1 in Microsoft Word

In Microsoft Word, Ctrl+1 changes the line, paragraph, or all highlighted text to single spacing.


Use Ctrl+2 to double space and Ctrl+5 to set the spacing to 1.5 line spacing.

Below are links to related keyboard key and keyboard shortcut pages.

A, Ctrl, Keyboard terms, Select all, Shortcut key