In PDF Studio Viewer, it is possible to undo most actions.

Undo or redo by clicking on the Undo or Redo buttons on the toolbar, or by using the standard shortcut keys:

Undo: CTRL + Z (Cmd + Z on Mac OSX)

Redo: CTRL + Y (Shift + Cmd + Z on Mac OSX)

Actions that can be undone / redone:


(Textbox, callout, sticky note, typewriter, 8 shapes, sound, image, link, area highlight, measurements, stamp)


Markup  (highlight, crossout, underline, squiggly, replace, insert)

Actions that reset the undo / redo stacks:




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