AddPDF is a utility for combing several PDF files into one single multipage PDF file, or splitting multipage PDF files into multiple single page PDFs, one per page.
Simply drag PDF files, or other file types which can be automatically converted, into the file list, re-arrange them using drag and drop and then click the "Add" or "Split" button to combine or split them.
Add transparent watermarks to each page with the "Stamp" button and "Alpha" control.
Consult the release notes for all features added in various releases of this product.
AddPDF is part of the Limit Point Software Utilities Bundle which includes all software at http://www.limit-point.com/Utilities.html. A single donation unlocks all the utility software, upgrades are free and new products included.
AddPDF is also available on the Mac App Store.