add page number to pdf footer using itextsharp

Namespaces

You will need to import the following namespaces.

C#

using System.IO;

using iTextSharp.text;

using iTextSharp.text.pdf;

 

VB.Net

Imports System.IO

Imports iTextSharp.text

Imports iTextSharp.text.pdf

 

 

Adding Page numbers to existing PDF

The PDF file to which the page numbers needs to be added is read into a Byte array from the disk. Then the byte array is read into a PdfReader object and a loop is executed over the pages of the PDF and the page number is added to each page using the PdfStamper class.

Finally the MemoryStream is saved to disk as PDF file.

C#

protected void AddPageNumber(object sender, EventArgs e)

{

    byte[] bytes = File.ReadAllBytes(@"D:\PDFs\Test.pdf");

    Font blackFont = FontFactory.GetFont("Arial", 12, Font.NORMAL, BaseColor.BLACK);

    using (MemoryStream stream = new MemoryStream())

    {

        PdfReader reader = new PdfReader(bytes);

        using (PdfStamper stamper = new PdfStamper(reader, stream))

        {

            int pages = reader.NumberOfPages;

            for (int i = 1; i <= pages; i++)

            {

                ColumnText.ShowTextAligned(stamper.GetUnderContent(i), Element.ALIGN_RIGHT, new Phrase(i.ToString(), blackFont), 568f, 15f, 0);

            }

        }

        bytes = stream.ToArray();

    }

    File.WriteAllBytes(@"D:\PDFs\Test_1.pdf", bytes);

}

 

VB.Net

Protected Sub AddPageNumber(sender As Object, e As EventArgs)

    Dim bytes As Byte() = File.ReadAllBytes("D:\PDFs\Test.pdf")

    Dim blackFont As Font = FontFactory.GetFont("Arial", 12, Font.NORMAL, BaseColor.BLACK)

    Using stream As New MemoryStream()

        Dim reader As New PdfReader(bytes)

        Using stamper As New PdfStamper(reader, stream)

            Dim pages As Integer = reader.NumberOfPages

            For i As Integer = 1 To pages

                ColumnText.ShowTextAligned(stamper.GetUnderContent(i), Element.ALIGN_RIGHT, New Phrase(i.ToString(), blackFont), 568.0F, 15.0F, 0)

            Next

        End Using

        bytes = stream.ToArray()

    End Using

    File.WriteAllBytes("D:\PDFs\Test_1.pdf", bytes)

End Sub