jPDF Tweak is a Swiss Army Knife GUI application for PDF documents: combine, split, rotate, reorder (n-up, booklet), watermark, edit bookmarks/fileinfo/pagetransition, compress, encrypt, decrypt, sign, repair, edit attachments and more.
Note that this tool specifically supports PocketMod, even an "upside down" option if you prefer the first fold closed on top. This was a lifesaver for since the standard pdf2pocketmod tool stopped working for me on W7 and I wasn't able to get multivalent to work.
An excellent tool!
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