Saving a document with methods save(String) or save(OutputStream) of Watermarker class, GroupDocs.Watermark puts it to any custom location.
You can see examples of save() methods in one of these guides:...Editor Product Solution GroupDocs...
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This section describes how to use GroupDocs.Viewer for Java to convert different document types to PDF, HTML, PNG, and JPEG formats....Editor Product Solution GroupDocs...