Aspose.Words and Aspose.Slides support the feature to convert DOC/DOCX/PPT/PPTX files to PDF and PDF/A compliant format and I am afraid they do not support the feature to directly save the output in PDF/X-3 format. Besides this, we have an API named Aspose.Pdf for Java which provides the feature to create as well as manipulate existing PDF files. However, I am afraid currently it does not support the feature to convert PDF files to PDF/X-3 format. For the sake of implementation, we have logged this requirement as PDFNEWJAVA-34369 in our issue tracking system.
So once this feature is implemented, you can convert your Word/PowerPoint files to PDF format and then try using Aspose.Pdf for Java to render the output as PDF/X-3. Please be patient and spare us little time. We are sorry for this inconvenience.
Thanks for sharing the information. Yes you are correct. The issue ID PDFNEWJAVA-34369 duplicates PDFNEWNET-35673 and therefore I have joined both issues.
Please note that the implementation of any New Feature depends upon its necessity in our API and number of requests from our customers. Sometimes the low priority features take longer time to implement.
Yes you are share the resultant files with as many customers as you want and our licensing mechanism/model does not restrict from sharing the resultant files.