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I'm aware Acrobat Pro DC can emulate a duplex scanner by first scanning the front, then the back of a stack of papers (which by the way never works for me... I get chronic messages that the scan has been cancelled at various stages), but what if you already have two separate PDF files, one with all the front sides and a second with all of the back sides and want to automatically merge them together as if they had been scanned with a duplex scanner in the first place? As a full Adobe Creative Suite annual subscriber, it's frustrating being pointed to purchase a third-party script. This feature must exist somewhere from Adobe?
Got to Tools > Merge documents. Then go to Tools > Organize pages.
Sorry, I may not have fully explained. I'm aware of the ability manually rearrange pages. What i'm looking for is the ability to process large documents, say 50 pages of fronts, 50 pages of backs scanned in reverse order, combine them into a single PDF, then have them collated automatically, ie move page 100 to page 2, page 98 (now the new page 100) to page 4, etc, Doing this manually in "organize pages" isn't really viable. Most consumer/small office MFP don't have reliable duplex paper feed scanning if at all.
Adobe doesn't do this. I use PDFSAM basic. It's free. It also combines files that have editing permissions locked with a password. I still use Adobe for everything other than these two processes. It would be nice if Adobe just added these two simple features.