Watermarks in images are usually used to claim ownership of the content. On the other hand, images are watermarked to avoid unauthorized usage or counterfeiting. In various cases, you may need to automate watermarking feature within your web or desktop applications. For such scenarios, this article covers how to add watermark to images programmatically using C#. This could also be useful when you need to watermark a batch of images in one go. So let’s begin.