This article will help, if you want to add watermark to images inside a document then it can be possible using GroupDocs.Watermark for Java....Assembly Product Solution GroupDocs...
The SetProperties method is used to update or add metadata. You can easily add metadata to photos, pdfs or you can update or add data to mp3 files....Assembly Product Solution GroupDocs...
Understand and extract human-readable (interpreted) values for metadata properties using GroupDocs.Metadata for Python via .NET....Assembly Product Solution GroupDocs...
Learn how to convert a XML document as a data source to a spreadsheet, CSV or JSON using GroupDocs.Conversion for .NET....Assembly Product Solution GroupDocs...
Learn this article and check how to load and convert CAD documents with advanced options using GroupDocs.Conversion for Java API....Assembly Product Solution GroupDocs...
The page describes document annotations of different types and how to add annotations to a document using GroupDocs.Annotation API....Assembly Product Solution GroupDocs...