I don't know but I can guess. Most of these PDF choppers & croppers don't actually remove anything. To chop a double page in half they duplicate the page and adjust the viewable area only. So one page has a 'window' only on the first half and the second page only on the second half.
I believe Adobe Acrobat Pro is one of the few programs with an option to actually remove the 'invisible' parts, but as I no longer have it installed I can't remember the exact command. Maybe a current user can oblige.
Edit: I think it was something like Examine Document followed by Remove Hidden Text
Last edited by jackie_w; 10-06-2013 at 12:33 PM.
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