

The default DjVu viewer won't allow converting to the PDF format, thus a third party program (virtual PDF printer) has to be installed in order to do the conversion. PDF on the other hand is so popular that most computers now have a PDF reader installed, thus if you need to share your content with others, PDF is the choice over DjVu. While in certain situations the size of a DjVu document is smaller than that of a PDF file (having the same contents), its main disadvantage is the low user base.
