Work with Watermark in PDF via C#

Work with watermarks in PDF document programmatically using Aspose.PDF for .NET Library

Aspose.PDF for .NET Logo
C# Java C++ Python

Most popular action with Watermarks in C#

Add Watermark to PDF
Get Watermark from PDF
Remove Watermark from PDF

Add Watermark with .NET Library

In order to add Watermark to PDF File, we’ll use Aspose.PDF for .NET API, which is a feature-rich, powerful, and easy-to-use document manipulation API for .NET. Open NuGet package manager, search for Aspose.PDF and install. You may also use the following command from the Package Manager Console.

Package Manager Console

PM > Install-Package Aspose.PDF

Add Watermark using C#

To try the code in your environment, you need Aspose.PDF for .NET.

  1. Load the PDF with an instance of Document.
  2. Create an instance of WatermarkArtifact.
  3. Set properties of WatermarkArtifact object.
  4. Add watermark using method Add of Aspose.Pdf.Page.Artifacts collection class.
  5. Save PDF file

Add Watermark in PDF - C#

This sample code shows how to add Watermark to PDF Pages - C#

Input file:

File not added

Output format:

Output file:

    Document document = new Document(_dataDir + "text.pdf");
    WatermarkArtifact artifact = new WatermarkArtifact();
    artifact.SetTextAndState(
        "WATERMARK",
        new TextState()
        {
            FontSize = 72,
            ForegroundColor = Color.Blue,
            Font = FontRepository.FindFont("Courier")
        });
    artifact.ArtifactHorizontalAlignment = HorizontalAlignment.Center;
    artifact.ArtifactVerticalAlignment = VerticalAlignment.Center;
    artifact.Rotation = 45;
    artifact.Opacity = 0.5;
    artifact.IsBackground = true;
    document.Pages[1].Artifacts.Add(artifact);
    document.Save(_dataDir + "watermark.pdf");