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How to undo and redo changes in Photoshop
While we’ve covered a variety of core functions in Photoshop, such as cropping, resizing, and saving to different formats, even more essential may be knowing how to undo and redo changes. Humans make mistakes after all, and you can potentially save yourself a lot of grief. There are two main ways to reverse changes.
QUICK ANSWER
To undo your last Photoshop action, hit Control-Z on a Windows PC, or Command-Z on a Mac. The respective redo shortcuts are Shift-Control-Z and Shift-Command-Z.
JUMP TO KEY SECTIONS
How to undo or redo changes in Photoshop by using your keyboard

In most cases, the best way to undo or redo is with a shortcut. To undo your last action, hit Control-Z on a Windows PC, or Command-Z on a Mac. If you change your mind, the redo shortcuts are Shift-Control-Z and Shift-Command-Z, respectively.
If you forget these shortcuts or it happens to be convenient, you can accomplish the same thing by selecting Undo or Redo in the Edit menu. In fact, using this method, Photoshop will tell you what you’re about to undo — so it might be preferable if you’re being cautious.
How to undo or redo changes in Photoshop by using the History panel

If you want maximum caution and control, the History panel is your friend. You can see and jump within a longer range of changes, normally up to a default of 20. You can increase that coverage by adjusting History States under Edit > Preferences > Performance. As that implies, you may need a beefier computer to handle more than the default.
To undo or redo using the History panel:
- If it’s not already open, access the History panel using Window > History.
- Click on an earlier state to undo all the changes after that point.
- Click on a later state to redo changes. To redo all changes, click on the state at the bottom of the list.
Read more: How to curve text in Photoshop