Keynote
Crop (mask) an image in Keynote for iCloud
You can crop an image by masking out parts you don’t want to show.
Double-click an image, then do any of the following:
Resize the image: Drag the slider below the image.
Reposition the image in the frame: Drag the image.
Resize the mask: Drag the selection handles on the dotted edge of the mask.
Move the mask: Drag the dotted edge of the mask.
When you’re satisfied with how the image looks, click Done.
To return the image to its original size, select the image, click Arrange at the top of the Format sidebar on the right, then below Size, click the Original Size button.
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