PrimoPDF is a partnership between Nitro PDF Software and activePDF, Inc. 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. Since its launch in February 2004 and with millions of users to date, PrimoPDF has rapidly become the world's most widely-used tool for free, basic conversion to PDF with millions of users to date and is consistently ranked as the #1 most popular Business & Productivity software download on CNET's Download.com.