The COMBINED PDF will display on the SCREEN unprintable characters (� = square box) on nearly every page! NO unprintable characters.ģ) Now try to combine about 35-60 PDF files into ONE PDF file (NOT good). All Fonts & characters appear fine (within the combined PDF). There are NO unprintable characters within the PDF.Ģ) CAN combine say 5 to 15 PDF files. Problem: when combining multiple PDF files into one PDF, the result will be a variety of unprintable characters.ġ) EACH individual PDF file appears fine (both on the screen and when printed).