I have lots of high-resolution images inserted into the Keynote which makes the file very large. Image masking in Keynote is very convenient for me. But I only want a small corner of the images shown in the slides, and I don't need the cropped part anymore. Reducing file size under the File menu loses image quality and the cropped images are still there. Is there any way to delete the cropped part to reduce file size without losing image resolution/quality?


I find that exporting as jpeg keeps sufficient quality and reduces the size markedly.

I usually crop using the screen editor / grab (cmnd shift 4) then open in preview and export as jpeg.


Probably the easiest sequence of steps:

  1. Copy masked image in Keynote
  2. Cmd+N in Preview
  3. Cmd+C
  4. Paste in Keynote

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