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Add Watermarks to PDF Documents Using C#

Optimize document workflows by programmatically adding watermarks to PDF files with 'Wordize for .NET'. Whether protecting proprietary PDF files or branding official reports, our solution applies professional watermarks with precise positioning across all PDF pages. The C# API enables creation of text/image watermarks with extensive customization, saving manual editing time while ensuring fast, professional results for PDF documents.

Key Features

  • Customizable text watermarks with font controls and transparency
  • Image watermark support for PNG, JPEG and other formats
  • Positioning via coordinates or predefined locations (center, diagonal)
  • Rotation angle, transparency, and layering adjustments

Use Cases

  • Confidential Documents: "Confidential" or "Not for Distribution" stamps
  • Draft Materials: "Draft" or "Under Review" markings
  • Corporate Docs: Brand reinforcement with company logos
  • Licensed Content: Copyright notices and IP protection

Wordize provides developers powerful tools for automating PDF watermarking in C#. With flexible settings, adapt watermarks to exact requirements. By integrating Wordize into .NET projects, developers create robust solutions for document branding, security, and workflow management.

C#
Run code
Upload your document
Select the target format from the list 
using Wordize.Watermarking;

Watermarker.SetText("Input.pdf", "Output.pdf", "Text of the watermark");
using Wordize.Watermarking; Watermarker.SetText("Input.pdf", "Output.pdf", "Text of the watermark");
Run code

How to Add Watermarks to PDF Files in C#

  1. Install Wordize for .NET
  2. Add library reference (import package) to C# project
  3. Create text/image watermark in PDF with required parameters

System Requirements

Our product is fully cross-platform and supports all major .NET implementations:

  • .NET ≥ 5.0
  • .NET Core ≥ 2.0
  • .NET Standard ≥ 2.0
  • .NET Framework ≥ 3.5
  • MonoMac
  • MonoAndroid
  • Xamarin

As far as .NET code doesn't depend on the underlying hardware or operating system, but only on a Virtual Machine, you are free to develop any kind of software for Windows, macOS, Android, iOS and Linux. Just make sure you have installed the corresponding version of .NET Framework, .NET Core, Windows Azure, Mono or Xamarin.

We recommend using Microsoft Visual Studio, Xamarin, and MonoDevelop integrated development environments to create C#, F#, VB.NET applications.

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