Creating a new file from a rectangular region of a PDF file I want to create a new PDF file from a rectangular region of an existing PDF file, old_file.pdf. Currently, I use the following rather laborious process:


Open the old_file.pdf in Preview.
Chose the rectangular regions using rectangular selection.
Copy the region using cmd c.
Paste the region into an empty slide in a Keynote file, using cmd v.
Export that single slide (by hiding all others) into a new_file.pdf.
Open new_file.pdf in Preview, chose and crop the rectangular region, then save the file and exit Preview.


Surely, there must be a better way. What is it?
You can select the region of interest and hit copy. Then go to the file menu and select 'New from Clipboard'. A new PDF file is displayed with only your selection.

Quick workflow example...