Pdfill Pdf Tools Portable 28
Download - https://urlca.com/2tfSfA
Bumping this old thread, I was looking for something similar myself and just recently ran across Scribus which has a portable version for 32-bit Windows right here ( _portable) but it does require also adding GhostScript Portable (also here: _portable) for full functionality. I haven't tried it yet but it seems to me from the description it will do what the OP and others wanted. I will post back after I have had a chance to try it (hopefully) this weekend.
podofo can be fairly easily compiled for your desired platform (or you can look for builds online). It comes with several tools -- podofomerge, podofoextract, etc. -- which are designed specifically for this purpose. It's a command line tool, which can be either a benefit or a drawback depending on whether you need to do things in batch (if you need to do this extremely often and with A LOT of PDFs, it can be faster to write a .bat file).
There are several online tools that do exactly what you want and without any install. One of the tools I use frequently is PDFalpha - it provides the drag and drop functionality right in your browser and is also cross-platform. 153554b96e