.NET API for Watermark Manipulation

‎Build .NET Applications to Operate Text & Image Based Watermarks with Smart Search & Strong Security Features.‎

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GroupDocs.Watermark for .NET enables you to build ready-to-market business applications in C#, ASP.NET and other .NET related technologies, which let your end-users, add new watermarks, search and remove existing watermarks in supported file formats. Using GroupDocs.Watermark for .NET, you can programmatically apply digital watermarks to multitude of file formats and discourage unauthorized use of intellectual property and securely label documents of sensitive nature by employing various built-in security measures offered by this API.

GroupDocs.Watermark for .NET Features

Add or Remove Watermarks from a Particular Section or whole Document of Various File Formats

Attach Watermark to all Images in a Particular Section, Page, Slide, or Document

Assign Watermark to only Particular Frames of a Multi-Framed Image

Allocate Hidden Watermark to PDF that only Appears when Printing Document

Set Watermark to all Attachments in an Excel Document & all Image Shapes in Slides

Place Watermark or Remove it from the Background Images of Spreadsheet or Slides

Employ Watermark to Supported Files in all Attachments of an Email or PDF Document

Apply or Remove Watermark as XObjects, Artifacts & Annotations in PDF Documents‎

Eliminate Watermark Containing Text with Particular Formatting

Look for Image Watermarks that Resemble a Particular Image

Identify Text Watermark Even if there are Unreadable Characters between Letters

Search Watermarks Based on Specific Parameters or by Combining Multiple Criteria

Specify Font Formatting to Look for Matching Text Watermark

Programmatically Extract Page Setup & Other Information for Supported Formats

Add Watermark to Images inside any Header & Footer in Supported Document Formats

Add Watermark to Image Shapes in a Word Document & Lock Watermarks to Restrict Editing

Protect Text Watermark using Unreadable Characters in Presentations

Rasterize Particular Page or Whole PDF Document to Protect Added Watermarks

Change Text Formatting While Replacing Existing Text Watermark

Align Watermark to Bleed Box, Art Box, Crop Box, or Trim Box in PDF Document

Edit Shape Properties in Microsoft Visio Documents

Adding Watermarks

GroupDocs.Watermark for .NET supports multiple types of watermarks. Adding watermarks of any type is only a matter of few lines of code. Following example demonstrates, applying an image watermark to Word document using C#:

// Load the document
using (FileStream stream = File.Open("document.docx", FileMode.Open, FileAccess.ReadWrite))
  using (Watermarker watermarker = new(Watermarker(stream))
          // Use path to the image as constructor's parameter
          using (ImageWatermark watermark = new ImageWatermark("logo.png"))
      watermark.HorizontalAlignment = HorizontalAlignment.Center;
      watermark.VerticalAlignment = VerticalAlignment.Center;
      // Save the resultant document

Apply Watermark to Files of Different Formats in a Go

GroupDocs.Watermark API allows you to apply watermark or delete watermark of all files in a specific folder in one go. The files can even be of different format and yet the watermark will be applied to all of them accurately.‎

Foolproof Security for Watermark

With only one line of code you can make it very difficult for any tool to remove your watermark from PDF files. This is achieved by converting all pages of a PDF document to raster images while keeping the original quality intact.

Support and Learning Resources

GroupDocs.Watermark offers document viewing APIs for other popular development environments