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How to modify (watermark) existing PDF document

I’ve reviewed the Aspose.pdf.java API and sample code, but can’t see how to modify an existing PDF document. I want to add watermarks to a PDF file created by some other application. Is this possible?


Thank you for considering Aspose.

That is supported by another product Aspose.Pdf.Kit.

Please refer to online demo of Aspose.PDF.Kit.