Split each PDF page in two?

Question

I have a large number of PDF files which have two slides to a page (for printing).

The format is A4 pages each with two slides setup like so:

-----------         


        

Answer 1

If using a Java or .Net library is ok for you, you can use iText / iTextSharp.

An example for tiling an existing document can be found in the book iText in Action, 2nd edition, in the freely available chapter 6: TilingHero.java / TilingHero.cs.