Basic usage

GroupDocs.Watermark library provides the ability to manipulate different watermark types such as TextWatermark, ImageWatermark. These watermarks could be added to documents, updated, removed, or searched inside already watermarked documents. Our product also provides information about document type and structure - file type, size, page count, etc. and generates document page previews based on provided options.

Here are the main concepts of the GroupDocs.Watermark API:

  • Watermarker is the main class that contains all the required methods for manipulating document watermarks.
  • Most part of the methods expect different options to add, update, search or remove watermarks inside a document.
  • The Watermarker class implements an IDisposable interface to correctly release used resources - like safely closing document streams when all operations are completed.

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Referencing required namespaces

The following code shows how to include the required namespaces for all code examples.

using GroupDocs.Watermark;
using GroupDocs.Watermark.Common;
using GroupDocs.Watermark.Contents;
using GroupDocs.Watermark.Options;
using GroupDocs.Watermark.Search;
using GroupDocs.Watermark.Watermarks;

Watermarker object definition

The following code shows the most used code pattern to define the Watermarker object and call its methods.

// Add text watermark to PDF document
using (Watermarker watermarker = new Watermarker("document.pdf"))
    TextWatermark watermark = new TextWatermark("Test watermark", new Font("Arial", 36, FontStyle.Bold | FontStyle.Italic));

Let’s review common usage scenarios when documents and watermarks are stored in a local drive and you want to manage them using GroupDocs.Watermark API:

More resources

Advanced usage topics

To learn more about document watermarking features and learn how to manage watermarks and more, please refer to the advanced usage section.

GitHub examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free online document watermarking App

Along with a full-featured .NET library, we provide simple, but powerful free Apps.

You are welcome to add watermark to PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, emails, and more with our Free Online Document Watermarking Apps.