Operating system: Windows Me, Windows 7, Windows Vista, Windows 2003, Windows 2000, Windows 98, Windows XP.
Supported input formats: DOC, DOCX, RTF, TXT, ODT, Webpages, HTML, PPT, PPTX.
Supported output formats: PDF.
PDFCreator is a free tool to create PDF files. Use it like a printer in Word, StarCalc or any other Windows application.
With PDFCreator you can encrypt the files and digitally sign your PDFs to ensure that you are the author and the file has not been modified.