View and edit files with Quick Look on Mac
Quick Look offers a fast, full-size preview of nearly any kind of file without opening the file. You can rotate photos, trim audio and video clips, and use Markup—directly in the Quick Look window.
Tip: Use Quick Look for items in Finder windows, on your desktop, in emails and messages, and other places.
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On your Mac, select one or more items, then press the Space bar.
A Quick Look window opens. If you selected multiple items, the last item you selected is shown first.
In the Quick Look window, do any of the following:
Resize the window: Drag the corners of the window. Or click
in the top-left corner of the Quick Look window. To exit full screen, move the pointer to the bottom of the window, then click 
. Zoom in and out of an item: Press Command-Plus (+) to make the image bigger or Command-Minus (–) to make it smaller.
Rotate an item: Click
or press and hold the Option key, then click 
. Keep clicking to continue rotating the item. Mark up an item: Click
. See Mark up files.Trim an audio or video item: Click
, then drag the yellow handles in the trimming bar. To test your changes, click 
. To start over, click Revert. When you’re ready to save your changes, click Done, then choose to replace the original file or create a new one.Browse items (if you selected multiple items): Click the arrows near the top-left of the window or press the Left Arrow or Right Arrow key. In full screen, click
to view the items as a slideshow.Show items in a grid (if you selected multiple items): Click
or press Command-Return.Open an item: Click Open with [App].
Share an item: Click
, then choose how you want to share the item.Copy the subject of an item: If the item is a screenshot or photo, you can isolate the subject of the picture from the background. Control-click the image, then choose Copy Subject. You can now paste the subject into a document, email, text message, or note.
When you’re done, press the Space bar or click
to close the Quick Look window.
When you open a Live Photo in the Quick Look window, the video portion of the photo plays automatically. To view it again, click Live Photo in the bottom-left corner of the photo.