Watermark PDF Files

Watermarking is a crucial technique for protecting your PDF documents and ensuring their authenticity. In this article, we will explore various methods to add watermarks to PDF files, both through online tools and programming languages like C# and Java. Whether you’re looking for a quick online solution or a more customized approach, we’ve got you covered.

How to Add Watermark to PDF Online

When it comes to adding watermarks to PDF files conveniently, online tools prove to be incredibly handy. Here we will use one such reliable option, which is GroupDocs.Watermark App.

Add Text and Image Watermarks to PDF Online

Follow these steps to watermark your PDF files online:

  1. Navigate to the Watermark app.
  2. Upload your PDF file by using the Browse button or Drag and Drop the PDF file to the designated upload area.
  3. Choose the watermark text or image you want to add.
  4. Customize watermark settings such as styling, transparency, rotation angle, position, and size.
  5. Once satisfied, click “Create Watermark” to apply the watermark.
  6. You can now download your watermarked PDF using the Download option.

Here is the watermarked PDF as an output of the above steps:

Watermarked PDF Output

How to Watermark PDF Files – Developer’s Guide

Hey programmers! let’s add text or image watermarks to your PDF documents. Here, we have multiple libraries to achieve the target. Here we’ll see how to put cool marks on PDF files using different languages. Take your time to explore the available options and select the one that best suits your requirements.

So, if you’re all set, let’s jump to programmatically add watermarks to your PDF documents. Let’s start coding!

Watermarking PDF Files using C#

For those who prefer more control over the watermarking process, programming languages like C# offer a robust solution.

  1. Integrate the library into your application.
  2. Utilize the provided code snippet below to watermark your PDF documents:

Additionally, refer to the article on How to add Text or Image Watermark to PDF Files using C#.

For further .NET API resources, you can explore the following links:

.NET API | Documentation | Download

Watermarking PDF Files using Java

Java enthusiasts can also enjoy the flexibility of watermarking PDF files using code. Here’s a glimpse of how it can be achieved:

  1. Download & Configure the library within your application.
  2. Use the provided source code to add watermark to PDF file:

Refer to the article on How to add Text or Image Watermark to PDF using Java for more in-depth instructions.

If you need additional resources for the Java API, you can explore the following links:

Java API | Documentation | Download


Watermarking PDF documents is a valuable practice for protecting your content. Whether you choose the convenience of online tools or the customization options provided by programming languages like C# and Java, adding watermarks enhances document security. Explore the various methods presented in this article and choose the one that best suits your needs.

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