PDF Printer lets you transform any file into a PDF document whenever you need it. PDF Printer runs as an virtual PDF printer, so you can add it to your Mac in the System Preferences, then print any documents directly to PDF. You can double-click to open any document, then tap "Print", select "PDF Printer" in the printers list, print to PDF in real-time, and it will be opened automatically. The process is 100% secure since conversion is done locally on your Mac. Your documents never leave it, and it does not require internet connection.
Also, the app lets you organize your PDF documents in different folders, and it automatically classifies your documents, separating emails, web pages, and other prints. PDF Printer supports printing of the following formats to PDF: Word, Excel, Powerpoint, Pages, Numbers, Keynote, RTF, RTFD, TXT, HTML, JPG, PNG, and Safari webarchive.