Add Watermark to a PDF document

You can add source-based watermarks and text watermarks to a PDF. Source-based means the source of the watermark is another PDF.

To add a source-based watermark to a PDF, do the following:

Create a PDFXpress object and initialize it.
Create a Document object from an existing PDF file.
Create a Document object from an existing PDF file to be used as the watermark source.
Create a PageArtifactOptions object.
Set the PageArtifactOptions:
- ArtifactType – specifies the type of watermark, in this case SourceWatermark
- Opacity – we set this to .5 to make the watermark translucent
- PageList – we set this to specify to what pages the watermark will be added
- SourceDocument – we set this to our source PDF watermark
- SourcePageNumber – we set this to 0 to specify the first page
Call AddWatermark() on the Document object to add the watermark.
Create a SaveOptions object.
Call Save() on the Document object to save the watermarked PDF.

C# Example	Copy Code
using System; using Accusoft.PdfXpressSdk; namespace PDFWatermark { class Watermark { static void Main(string[] args) { using (PdfXpress pdf = new PdfXpress()) { pdf.Initialize(@"C:\Users\Public\Documents\Accusoft\PDFXpress\v7.0\Support\Font", @"C:\Users\Public\Documents\Accusoft\PDFXpress\v7.0\Support\CMap"); using (Document doc = new Document(pdf, "C:\\myfile.pdf")) { using (Document sourceDoc = new Document(pdf, "C:\\source.pdf")) { //create the page artifact options PageArtifactOptions po = new PageArtifactOptions(); po.ArtifactType = TypeOfArtifact.SourceWatermark; po.Opacity = .5; PageRange pageRange = new PageRange(); pageRange.PageCount = 1; pageRange.StartPageNumber = 0; PageList pageList = new PageList(); pageList.Add(pageRange); po.PageList = pageList; po.SourceDocument = sourceDoc; po.SourcePageNumber = 0; //add the watermark doc.AddWatermark(po); //set the save options SaveOptions so = new SaveOptions(); so.Filename = "C:\\watermarked.pdf"; so.Overwrite = true; so.Linearized = true; //save the document doc.Save(so); } } } } } }

C# Example

Copy Code

using System;
using Accusoft.PdfXpressSdk;
namespace PDFWatermark
{
    class Watermark
    {
        static void Main(string[] args)
        {
            using (PdfXpress pdf = new PdfXpress())
            {
                pdf.Initialize(@"C:\Users\Public\Documents\Accusoft\PDFXpress\v7.0\Support\Font",
                               @"C:\Users\Public\Documents\Accusoft\PDFXpress\v7.0\Support\CMap");
                using (Document doc = new Document(pdf, "C:\\myfile.pdf"))
                {
                    using (Document sourceDoc = new Document(pdf, "C:\\source.pdf"))
                    {
                        //create the page artifact options
                        PageArtifactOptions po = new PageArtifactOptions();
                        po.ArtifactType = TypeOfArtifact.SourceWatermark;
                        po.Opacity = .5;
                        PageRange pageRange = new PageRange();
                        pageRange.PageCount = 1;
                        pageRange.StartPageNumber = 0;
                        PageList pageList = new PageList();
                        pageList.Add(pageRange);
                        po.PageList = pageList;
                        po.SourceDocument = sourceDoc;
                        po.SourcePageNumber = 0;                       
                        //add the watermark
                        doc.AddWatermark(po);
                        //set the save options
                        SaveOptions so = new SaveOptions();
                        so.Filename = "C:\\watermarked.pdf";
                        so.Overwrite = true;
                        so.Linearized = true;
                        //save the document
                        doc.Save(so);
                    }
                }
            }
        }
    }
}