Merge, split, rotate, reorder, watermark, encrypt your PDF files, with jPDF Tweak

jPDF Tweak is a free Java application that can combine, split, rotate, reorder, watermark, encrypt, sign, and otherwise tweak PDF files.

You can use jPDF Tweak to make printable booklets from your PDFs.

You can also add PDF bookmarks and effects (page transitions), combine multiple PDF files, add watermark, rotate pages, attach files to PDF, encrypt and sign your PDFs, change metadata (like author or keywords), and more.

jPDF Tweak uses the iText library for manipulating PDF files, and JGoodies Forms for the GUI.