Alternatively known as Cmd+A, Command+A is a keyboard shortcut to select all text, files, pictures, or other objects while in a graphical user environment.
How to use the Command+A keyboard shortcut
Command+A in Excel and other spreadsheet programs
If you're editing the contents of a cell and press Command+A, nothing will happen.
Command+A in Word and other word processors
In Microsoft Word and other word processors, pressing Command+A selects all of the text in the document. If you're working with a document with multiple pages, this keyboard shortcut selects all text on all pages.
Using Command+A in an Internet browser
In all major Internet browsers (e.g., Chrome, Edge, Firefox), pressing Command+A selects all text, images, and other objects on the page. If you do not want to select everything, it may be better to use the mouse to choose specific items.
Related keyboard shortcuts and keys
Below are links to related keyboard shortcuts and individual key pages.