How to undo and redo an action in Flat
Last updated September 17, 2026
Undo in Flat cancels an action you just made on a score, and redo brings back an action you have undone. Flat lets you undo a complete set of actions, so nothing you try while composing is permanent — step back through what you just wrote, then step forward again if you change your mind.
These actions are available in the document toolbar:
How do I undo an action?
You can undo an action using this icon in the toolbar 
. Every undo cancels one more action, so repeating it walks you back through a complete set of changes you just made — useful when a whole passage went the wrong way, not just the last note.
You can click the toolbar or use your keyboard shortcuts: Cmd / Ctrl + Z
How do I redo an action?
You can redo an undone action using this button 
. Redo is the mirror of undo: it re-applies the change you just cancelled, so undoing one step too many costs you nothing and you can move back and forth until the score looks right.
You can click the toolbar or use your keyboard shortcuts: Cmd / Ctrl + Y
Frequently asked questions
What are the keyboard shortcuts for undo and redo?
Undo is Cmd / Ctrl + Z and redo is Cmd / Ctrl + Y. Both also have a button in the document toolbar, so you can mix the two. Every other editing shortcut is listed on the keyboard shortcuts page.
Can I undo more than one action at a time?
Yes. Undo is not limited to the very last thing you did: each undo cancels one more action, so clicking the button or pressing the shortcut repeatedly cancels a complete set of actions you just composed. Redo walks the same steps forward again.
How do I go back to an earlier version of my score?
Undo and redo work on the actions you just made. To go further back, Flat keeps a history of your score, which is the place to look when the change you want to cancel is older than your current editing session.