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.