PrimoPDF is a free tool provided by Nitro Software, Inc that offers high-quality conversion to PDF, comprising a user-friendly interface that enables printing to PDF from virtually any Windows application. Key features include the ability to optimize PDF output for screen, print, e-book, and prepress, secure PDF files with 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, and improved PDF output also available.