CmdShiftZ

CmdShiftZ, written as Command+Shift+Z, is a keyboard shortcut commonly used on macOS to redo the previously undone action. It serves as the counterpart to Undo (Command+Z). In most applications, after performing an Undo, pressing Command+Shift+Z reapplies the most recent action that was reversed, and repeated use can redo multiple steps in sequence.

The exact behavior of CmdShiftZ can vary by application, but it is a standard convention in many text editors, integrated development environments, and creative software. Applications such as graphics and video editing tools often adopt Command+Shift+Z as the redo command to mirror their undo stack. Some programs may offer alternative mappings, such as Command+Y, or allow users to customize key bindings.

On Apple keyboards, the shortcut relies on the Command and Shift modifiers in combination with the Z key. Layout differences across international keyboards generally do not change the functional combination, though labels may differ. The effectiveness of CmdShiftZ also depends on the specific undo/redo implementation within an app, such as a linear history versus a more complex history model, but the intended use remains redoing the most recent undone action.

See also: Undo (Cmd+Z) and the general concept of redo.