How to Stamp Barcodes on PDFs

Stamp Barcode on Existing PDF Page

Apart from exporting barcodes as PDF, one of the most popular functionalities in IronBarcode is the ability to stamp the GeneratedBarcode directly onto a user's existing PDF document. The following code snippet demonstrates how to do this.

:path=/static-assets/barcode/content-code-examples/how-to/StampBarcodeOnExistingPdfPage.cs

using IronBarCode;

GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode/", BarcodeEncoding.Code128, 200, 100);
myBarcode.StampToExistingPdfPage("pdf_file_path.pdf", x: 200, y: 100, 3, "password");

Imports IronBarCode

Private myBarcode As GeneratedBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode/", BarcodeEncoding.Code128, 200, 100)
myBarcode.StampToExistingPdfPage("pdf_file_path.pdf", x:= 200, y:= 100, 3, "password")

From the code snippet above, we simply call the StampToExistingPdfPage() method with a GeneratedBarcode object to stamp the object onto the PDF document. Below are the parameters used in this method:

• pdfFilePath: A System.String representing the path of the PDF document in memory.
• x: A System.Int32 representing the horizontal position on the PDF page in pixels.
• y: A System.Int32 representing the vertical position on the PDF page in pixels.
• pageNumber: A System.Int32 indicating the PDF page to stamp. Note this value is 1-indexed, so the first page is represented as 1.
• password: A System.String for a password required to open the PDF. This is optional and only used for password-protected PDFs. Users can leave this argument blank if the PDF is not password-protected.

Running the code snippet above will stamp the GeneratedBarcode immediately into the PDF document without an intermediate document saving step.

Stamp Barcode on Multiple PDF Pages

Sometimes, the same barcode is needed to be stamped on multiple pages rather than on one page. Instead of looping the above method to stamp the same barcode on multiple pages, users can use the StampToExistingPdfPages() method from the GeneratedBarcode class to do this directly. The following code snippet demonstrates how this method can be used.

:path=/static-assets/barcode/content-code-examples/how-to/StampBarcodeOnMultiplePdfPages.cs

using IronBarCode;
using System.Collections.Generic;

GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode/", BarcodeEncoding.Code128, 200, 100);
List<int> pages = new List<int>();
pages.Add(1);
pages.Add(2);
pages.Add(3);
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x: 200, y: 100, pages, "password");

Imports IronBarCode
Imports System.Collections.Generic

Private myBarcode As GeneratedBarcode = BarcodeWriter.CreateBarcode("https://ironsoftware.com/csharp/barcode/", BarcodeEncoding.Code128, 200, 100)
Private pages As New List(Of Integer)()
pages.Add(1)
pages.Add(2)
pages.Add(3)
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x:= 200, y:= 100, pages, "password")

Below are the parameters used in this method:

• pdfFilePath: A System.String representing the path of the PDF document in memory.
• x: A System.Int32 representing the horizontal position on the PDF page in pixels.
• y: A System.Int32 representing the vertical position on the PDF page in pixels.
• pageNumbers: An IEnumerable comprising the PDF pages to stamp. Note these values are 1-indexed, so the first page of a PDF is represented as 1.
• password: A System.String for a password required to open the PDF. This is optional and only used for password-protected PDFs. Users can leave this argument blank if the PDF is not password-protected.