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Shift & CMD + Z: Use this shortcut to redo the effect or adjustment you have done previously. It is pretty useful, especially when you open a folder full of images with Preview. Shift & CMD + F: Use this shortcut to activate the slideshow mode.CMD+ T: Use this shortcut to show fonts so that you can choose your favorite font.It helps you get away with the difficulty of having to scroll the PDF pages down to the last page. CMD + D: Use this shortcut to add bookmarks to your document so that you can come back to them later.This makes applying adjustments to documents very much easier. Alt (options key) & CMD + C: Use this shortcut to adjust color.Alt (options key) & CMD+ 0: Use this shortcut to zoom all opened images to actual size.It can be pretty useful when it comes to focusing on reading rather than editing. CMD+ B: Use this shortcut to hide the toolbar.This helps you set the required parameters for adjustments in relation to the actual size of the document. CMD+ R: Use this shortcut again to view the document in actual size.Alt (options key) & CMD+ B: Use this shortcut to show the image background.Alt (options key) & CMD+ T: Use this shortcut to open up the special characters panel.It is pretty useful when you keep making mistakes and need more editing.
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CMD+ Z: Use this shortcut to undo changes to the document or image you are working on.Use this shortcut to go to the next page of the document you are viewing inside of Preview. Option–Down Arrow: This shortcut works on the El Capitan version of Preview.
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