Publisher's description of PrimoPDF

PrimoPDF is a free tool for high-quality PDF creation, comprising a user-friendly interface that enables printing to PDF from virtually any Windows application. Additionally,

PrimoPDF provides the ability to optimize PDF output for screen, print, ebook, and prepress, secure PDF files with 40- or 128-bit encryption, and add document information (e.g. title, author, subject, keywords) to converted PDF files. Full support for 64-bit machines, double byte character and non-TrueType font support, enhanced support for Microsoft Windows 98, ME, NT, and Vista and improved PDF output also now available. Please note that this download is for 32-bit machines only. A 64-bit installer is available at the developer's Web site.

Version 3.1 introduces the ability to merge and append PDF files.