Merging Documents

• Nov 13, 2018
• 2 minutes to read

The PDF Document API component allows you to merge multiple PDF documents.

Before merging, create a document with no pages.

To create this document, create a PdfDocumentProcessor object instance and call the overloaded PdfDocumentProcessor.CreateEmptyDocument method (for example, via a file path).

This method saves the merge result on a local disk to decrease memory consumption when merging documents. This means the document’s content is not kept in memory during the merging.

Note

The PDF Document API component retains the original document’s content while merging documents.

To add a required document to the resulting document, call an overloaded PdfDocumentProcessor.AppendDocument method.

When the merge is completed, close the resulting document by disposing of the PdfDocumentProcessor instance.

Note that you do not need to save this document since it is written during the merging.

Example

This example illustrates how to use the PDF Document API component for merging pages of two separate PDF documents into a single PDF document.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-merge-documents-into-a-single-pdf-t114298

Program.vb

Imports DevExpress.Pdf

Namespace PdfMergeExample

    Friend Class Program
        Shared Sub Main(ByVal args() As String)

            Using pdfDocumentProcessor As New PdfDocumentProcessor()
                pdfDocumentProcessor.CreateEmptyDocument("..\..\docs\Merged.pdf")
                pdfDocumentProcessor.AppendDocument("..\..\docs\TextMerge1.pdf")
                pdfDocumentProcessor.AppendDocument("..\..\docs\TextMerge2.pdf")
            End Using
        End Sub
    End Class
End Namespace

Program.cs

using DevExpress.Pdf;

namespace PdfMergeExample {

    class Program {
        static void Main(string[] args) {

            using (PdfDocumentProcessor pdfDocumentProcessor = new PdfDocumentProcessor()) {
                pdfDocumentProcessor.CreateEmptyDocument("..\\..\\docs\\Merged.pdf");
                pdfDocumentProcessor.AppendDocument("..\\..\\docs\\TextMerge1.pdf");
                pdfDocumentProcessor.AppendDocument("..\\..\\docs\\TextMerge2.pdf");             
            }
        }
    }
}