Add watermark on every page of the WinForms PDF document using C#

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The Syncfusion Essential PDF is a feature-rich and high-performance .NET PDF library that is used to create, read, and edit PDF documents programmatically without Adobe dependencies. This library also offers functionality to merge, split, stamp, forms, compress, and secure PDF files. Using this library, you can add a watermark on every page of the pdf document.

Steps to add a watermark on every page of the pdf document programmatically

1. Create a new C# console application project.

Create console application

2. Install the Syncfusion.PDF.WinForms NuGet packages as a reference to your .NET Framework application from NuGet.org.

NuGet package reference

3. Include the following namespaces in the Program.cs file.

using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf.Parsing;

VB.NET

Imports Syncfusion.Pdf
Imports Syncfusion.Pdf.Graphics
Imports Syncfusion.Pdf.Parsing

4. The following code example shows how to add watermark on every page of the pdf document using C#.

            //Load the PDF document
            PdfLoadedDocument loadedDocument = new PdfLoadedDocument("../../Data/Barcode.pdf");
 
            //Set the font
            PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 20);
 
            foreach (var page in loadedDocument.Pages)
            {
                //Get the loaded page
                PdfLoadedPage loadedPage = page as PdfLoadedPage;
 
                //Create graphics 
                PdfGraphics graphics = loadedPage.Graphics;
 
                //Draw watermark text
                PdfGraphicsState state = graphics.Save();
                graphics.SetTransparency(0.25f);
                graphics.RotateTransform(-40);
 
                graphics.DrawString("Imported using Essential PDF", font, PdfPens.Red, PdfBrushes.Red, new PointF(-150, 450));
 
                graphics.Restore();
            }
 
            //Save and close the document
            loadedDocument.Save("Watermark.pdf");
            loadedDocument.Close(true);

VB.NET

       'Load the PDF document
        Dim loadedDocument As PdfLoadedDocument = New PdfLoadedDocument("../../Data/Barcode.pdf")
        'Set the font
        Dim font As PdfFont = New PdfStandardFont(PdfFontFamily.Helvetica, 20)
 
        For Each page In loadedDocument.Pages
            'Get the loaded page
            Dim loadedPage As PdfLoadedPage = TryCast(page, PdfLoadedPage)
            'Create graphics 
            Dim graphics As PdfGraphics = loadedPage.Graphics
            Dim state As PdfGraphicsState = graphics.Save()
            graphics.SetTransparency(0.25F)
            graphics.RotateTransform(-40)
            'Draw watermark text
            graphics.DrawString("Imported using Essential PDF", font, PdfPens.Red, PdfBrushes.Red, New PointF(-150, 450))
            graphics.Restore()
        Next
        'Save and close the document
        loadedDocument.Save("Watermark.pdf")
        loadedDocument.Close(True)

A complete working sample can be downloaded from a watermark for every page of the pdf document sample.

By executing the program, you will get the PDF document as follows.

Output document

Refer to here to explore the rich set of Syncfusion Essential PDF features.

Note:

Starting with v16.2.0.x, if you reference Syncfusion assemblies from the trial setup or NuGet feed, include a license key in your projects. Refer to the link to learn about generating and registering the Syncfusion license key in your application to use the components without trail message.

Add watermark on every page of the WinForms PDF document using C#

Steps to add a watermark on every page of the pdf document programmatically

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