Hi Aspose Words Support team
Thanks for your inquiry. Please note that Aspose.Words
requires TrueType fonts when rendering documents to fixed-page formats
(JPEG, PDF or XPS). Make sure you have all the Fonts installed on your
machine you’re using to convert Rtf to Pdf format. I would suggest you please read the following articles:
If you still face problem, please attach
your input RTF document here for testing. I will investigate the issue
on my side and provide you more information.