We have already discussed ways to watermark different [documents][1], [images][2], and [presentations][3]. Today, we will be discussing how to add watermark to an Excel workbook in different ways using C# with the .NET application.
Add Watermark to Presentation Slides using C#
Watermarks are normally used to protect the documents from any unauthorized use. To protect your presentations and to claim ownership, today we will learn how to programmatically add text and image watermarks to the Microsoft PowerPoint presentations within .NET applications using C#. In a separate article, we have seen [applying watermarks to images in C#][1].
Add Watermark to Images using C#
Let us see today, how to add watermarks to images. This helps you branding your official photography, and protects your pictures from any unauthorized use. This article will guide you to programmatically add text and images watermarks to your image files using C#. In an earlier post, we have seen the same to [add text and image based watermarks to images using Java][1]. After reading this article, it will not be difficult for you to add watermarks to JPG/JPEG, PNG, WebP, GIF, TIFF, JP2, BMP images using C# within your .NET application.
Add Watermark to Documents while Conversion in C# or Java
Document conversion is one of the most frequent processes that endures across a lot of industries. Sometimes, it is the business need to put a watermark on the resultant document after conversion. For example, you want to convert a Word document to PDF or PowerPoint PPT/PPTX to PDF with a watermark (text or image) in all the PDF pages.
GroupDocs.Conversion for .NET and Java gives you such an option. It possesses a class WatermarkOptions with rich properties such as: