CUPS-PDF provides a PDF Writer backend to CUPS. This can be used as a
 virtual printer in a paperless network or to perform testing on CUPS.
 .
 Documents are written to a configurable directory (by default to ~/PDF)
 or can be further manipulated by a post-processing command.
 .
 Desktop users might find it simpler to use the Print To File feature
 provided by GTK+ and QT or the LibreOffice's Export to PDF feature.