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Render Demo

In your github demo, it can render docx file, Is it possible to modify and save the docx file in the render?

@softboy Sure, you can modify DOCX document using Aspose.Words. Please see our documentation for more information:

Sorry for the confusion. Of course, i know we can modify docx document using this lib. What i mean is currently in the demo the render can only read the docx document, without modify functionality UI. Is it possible to adding the modify UI?

@softboy Aspose.Words is a library for processing documents programmatically it does not provide UI components for viewing or editing documents. However, Aspose.Words can be used as a backend component in such UI components, like in the provided demo.
You can consider using our sisters company product GroupDocs.Editor.

Does GroupDocs.Editor support convert docx to PDF? or have to purchase other product?

@softboy Yes, GroupDocs.Editor supports PDF format. Please see the documentation for more information:
If you have further questions regarding GroupDocs.Editor, it is better to ask in the dedicated GroupDocs.Editor support forum. My colleagues from GroupDocs.Editor team will help you shortly.