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Use preview.app to insert images as pages into a pdf

  1. Open image in Preview.app, "print" and save as pdf
  2. Open pdf you want to add to
  3. Open the pages pane
  4. Drag and drop the image pdf you just created into the pages pane (in whatever sequence you want it)
  5. Preview.app will show the pdf to be "edited"
  6. Save the pdf
You can directly drag and drop the image file from the Finder into the pages pane. This will, however, add a white border round the image.
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