If you meet the similar issues, and do not want to pay for it, please try Free PDF Page Divide Online service,

• I have a few files with 100-150 scanned A3 images that I would like to split into A4 pages for printing
• I have a 2-Up PDF, and I want to recovery it to the original size

it has the same function with my desktop version PDF PageDivide, but limit 10M upload and output.

btw, it is my 2nd Google App Engine application, also bases on modified version iText 2.1.7.

Thanks Richard Ramey for his donation, it is the first 10 dollar for the PdfCrypt.
BTW, If you do not want to download PdfCrypt, or you do not have windows system, but still want to remove the PDF Password(either user password or owner password) and stricts(print, copy and so on), please feel free to try my free Remove PDF Password Online solution hosted on Google App Engine(GAE/J), it bases on modified iText 2.1.7.