100% .NET SDK that adds functionality to watermark image files (JPG, PNG, GIF, TIFF) with text, text annotations and logo pictures
to your .NET desktop or Web application.

Benefits:

• Royalty-free distribution along with your product/application;
• Made with 100% C# code for .NET (optional full source code licensing is available);
• built-in set of ready-to-use customizable presets: Simple Text, Text Annotation, Logo Image,
  Logo With Text, Text Fits Page, Vertical Text, FileName, DateTime stamp presets and other;
• adjustable transparency for text and logo images;
• customizable font settings, text location, rotation, margins and other;
• supports batch watermarking of image files;
• image resizing option (including batch resizing);
• ability to add effects to pictures for better protection;
• provides ability to process pictures using stream-to-stream operation (for Web applications);
• provides support for EXIF and picture file information macros;
• supports JPEG, TIFF (including CCITT b/w documents), GIF, PNG image formats as input and output;
• 12 months of free updates and 12 months of free tech support via e-mail (within 2 business days) are included.
  Additional 12 months are available at 30% of regular price.

Not a .NET software developer and need watermarking functionality? Try our ready-to-use watermark software for Windows: Bytescout Watermarking or Bytescout Watermarking Pro.

If you prefer not to use commercial software, then check the tutorial to learn how to add a simple text watermark using .NET built-in classes only (VB, C#, ASP.NET)