Here are listed supported file formats when creating / combining files in Nitro PDF Pro.
Microsoft Office Files - (*.doc,* .docx, *.xls,* .xlsx, *.ppt,* .pptx, *.pub,* .vsd)
Corel WordPerfect - (*.wpd)
HTML - (*.htm,* .html)
Rich Text Format - (*.rtf)
Text - (*.txt)
BMP - (*.bmp)
GIF - (*.gif)
JPEG - (*.jpg,* .jpeg, *.jpe)
PNG - (*.png)
TIFF - (*.tiff,* .tif)
Windows Meta-file - (*.wmf,* .emf)
For more information regarding how to use Nitro Products, please visit the following website for all our online resources: https://www.gonitro.com/support