Add Text or Image Watermarks to Documents in C#

apply-watermarks-to-images-and-documents.md

The below C# code example demonstrates how to convert a Word document to PDF and then add a text watermark to the converted PDF file in your C# .NET applications.

API to Use

• GroupDocs.Conversion for .NET: https://products.groupdocs.com/conversion/net/

View a list of all supported file formats https://docs.groupdocs.com/conversion/net/supported-document-formats/

Installation

Download GroupDocs.Conversion library from https://downloads.conholdate.com/total/net or install the whole package directly from Nuget https://www.nuget.org/packages/Conholdate.Total/ into your workplace.

convert-pptx-to-pdf-and-add-text-watermark-to-converted-pdf.cs

// Supports converting documents and adding watermarks to 100+ file formats including Word, Excel, PowerPoint, Project, Images, Web, Email, Metafiles and Diagrams
// Supported file formats: https://docs.groupdocs.com/conversion/net/supported-document-formats/

using (Converter converter = new Converter("input.pptx"))
{
    WatermarkOptions watermark = new WatermarkOptions
    {
        Text = "Sample watermark",
        Color = Color.Red,
        Width = 100,
        Height = 100,
        Background = true
    };

    PdfConvertOptions options = new PdfConvertOptions
    {
        Watermark = watermark
    };

    converter.Convert("output.pdf", options);

convert-word-to-pdf-and-add-text-watermark-to-converted-pdf.cs

// Supports converting documents and adding watermarks to 100+ file formats including Word, Excel, PowerPoint, Project, Images, Web, Email, Metafiles and Diagrams
// Supported file formats: https://docs.groupdocs.com/conversion/net/supported-document-formats/
using (Converter converter = new Converter("input.docx"))
{
    WatermarkOptions watermark = new WatermarkOptions
    {
        Text = "Sample watermark",
        Color = Color.Red,
        Width = 100,
        Height = 100,
        Background = true
    };

    PdfConvertOptions options = new PdfConvertOptions
    {
        Watermark = watermark
    };

    converter.Convert("output.pdf", options);
}