How to Stamp Barcodes on PDFs Using C#

Hairil Hasyimi Bin Omar

Updated: 4. Juni 2026

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  # How to Stamp Barcodes on PDFs Using C&#35; Stamp barcodes onto existing PDF documents in C# using IronBarcode's `CreateBarcode` method with `StampToExistingPdfPage` for single pages or `StampToExistingPdfPages` for multiple pages, specifying coordinates and page numbers. *as-heading:2(Quickstart: Stamp a GeneratedBarcode onto a PDF Page)* This example demonstrates generating a barcode using IronBarcode's `CreateBarcode` and stamping it onto an existing PDF page. Supply the PDF path, position coordinates, and page number. ```cs :title=Stamp Barcodes on Your PDFs IronBarCode.BarcodeWriter.CreateBarcode("https://my.site", IronBarCode.BarcodeEncoding.QRCode, 150, 150) .StampToExistingPdfPage("report.pdf", x: 50, y: 50, pageNumber: 1); ``` `StampToExistingPdfPage` `StampToExistingPdfPages` <div class="hsg-featured-snippet"> <h3>Minimal Workflow (5 steps)</h3> <ol> <li><a class="js-modal-open" data-modal-id="trial-license-after-download" href="https://nuget.org/packages/BarCode/">Download C# library to stamp barcode on PDF</a></li> <li>Create a barcode with a specified barcode type and value</li> <li>Specify the barcode size</li> <li>Utilize the <code>StampToExistingPdfPage</code> method to stamp the barcode on a single PDF page</li> <li>Use the <code>StampToExistingPdfPages</code> method to stamp the barcode on multiple PDF pages</li> </ol> </div> ## How Do I Stamp a Barcode on an Existing PDF Page? Apart from <a href="/csharp/barcode/how-to/create-barcode-as-pdf/">exporting barcodes as PDF</a>, IronBarcode enables stamping the `GeneratedBarcode` directly onto existing PDF documents. This feature is useful when adding tracking codes, inventory labels, or document identifiers to existing reports, invoices, or forms. The following code snippet demonstrates this task. ```csharp :path=/static-assets/barcode/content-code-examples/how-to/StampBarcodeOnExistingPdfPage.cs ``` ### What Parameters Does StampToExistingPdfPage Require? `StampToExistingPdfPage()` `GeneratedBarcode` The code snippet calls the `StampToExistingPdfPage` method to stamp the object onto the PDF document. This method provides flexibility while maintaining simplicity. Below are the method parameters: * `pdfFilePath`: A **System.String** representing the PDF document path (relative or absolute). * `x`: A **System.Double** for horizontal position in pixels from the left edge. * `y`: A **System.Double** for vertical position in pixels from the bottom edge. * `pageNumber`: A **System.Int32** indicating the page (1-indexed, first page is 1). * `password`: A **System.String** for password-protected PDFs (optional). ### When Should I Use StampToExistingPdfPage? Running the code snippet stamps the `GeneratedBarcode` directly into the PDF document without intermediate saving. This method suits scenarios requiring: `StampToExistingPdfPages()` `GeneratedBarcode` * Unique tracking codes on shipping labels or delivery documents * Batch numbers on manufacturing reports * Document control numbers on legal or regulatory forms * QR codes for digital authentication or quick access links The direct stamping approach saves processing time and eliminates temporary files. For information on different barcode types, see the <a href="/csharp/barcode/get-started/supported-barcode-formats/">supported barcode formats</a> guide. ## How Do I Stamp a Barcode on Multiple PDF Pages? Sometimes the same barcode needs stamping on multiple pages. Common uses include applying document identifiers to every page of multi-page reports, adding version control codes throughout technical documents, or inserting security barcodes on each page of confidential materials. Instead of looping the single-page method, use the `StampToExistingPdfPages` method on the `GeneratedBarcode` object. The following code snippet demonstrates this method. ```csharp :path=/static-assets/barcode/content-code-examples/how-to/StampBarcodeOnMultiplePdfPages.cs ``` For flexibility, use LINQ to generate page ranges dynamically: ```csharp // Stamp on all even pages from 2 to 10 var evenPages = Enumerable.Range(1, 10).Where(x => x % 2 == 0).ToList(); myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x: 200, y: 100, evenPages, "password"); // Stamp on the first and last 3 pages of a 20-page document var selectedPages = new List<int> { 1, 2, 3, 18, 19, 20 }; myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x: 200, y: 100, selectedPages, "password"); ``` ### What Parameters Does StampToExistingPdfPages Accept? Below are the method parameters: * `pdfFilePath`: A **System.String** representing the PDF document path. * `x`: A **System.Double** for horizontal position in pixels. * `y`: A **System.Double** for vertical position in pixels. * `pageNumbers`: An **`IEnumerable<System.Int32>`** of pages to stamp (1-indexed). * `password`: A **System.String** for password-protected PDFs (optional). `StampToExistingPdfPages()` `StampToExistingPdfPage()` `GeneratedBarcode` ### Why Use StampToExistingPdfPages Instead of Looping? This method provides efficient barcode stamping on multiple pages without manual iteration, improving code readability and performance. The internal implementation optimizes PDF processing, resulting in: * **Faster execution:** PDF opened and processed once, not multiple times * **Lower memory usage:** Efficient resource management for large PDFs * **Cleaner code:** No manual loop and error handling management * **Atomic operations:** All pages stamped in single operation ## Advanced Stamping Techniques ### Customizing Barcode Appearance Before Stamping Before stamping your barcode onto a PDF, customize its appearance. IronBarcode offers extensive <a href="/csharp/barcode/how-to/customize-barcode-style/">customization options</a>: ```csharp :path=/static-assets/barcode/content-code-examples/how-to/create-and-stamp-barcode-pdf-5.cs ``` ### Working with Different Barcode Types Different scenarios require different barcode types. QR codes suit URLs and large data sets, while Code128 works for alphanumeric identifiers. Learn more about <a href="/csharp/barcode/tutorials/csharp-qr-code-generator/">creating QR codes</a> or explore other formats: ```csharp :path=/static-assets/barcode/content-code-examples/how-to/create-and-stamp-barcode-pdf-6.cs ``` ### Error Handling and Best Practices Implement proper error handling when working with PDF stamping operations: ```csharp :path=/static-assets/barcode/content-code-examples/how-to/create-and-stamp-barcode-pdf-7.cs ``` ### Performance Considerations When working with large PDFs or multiple stamping operations, consider these tips: 1. **Batch Operations:** Use `StampToExistingPdfPages` instead of looping `StampToExistingPdfPage` 2. **Barcode Caching:** Create once and reuse the `GeneratedBarcode` object 3. **Coordinate Calculation:** Pre-calculate consistent position coordinates 4. **Memory Management:** Process very large PDFs in batches For advanced scenarios involving reading barcodes from PDFs after stamping, see our guide on <a href="/csharp/barcode/how-to/read-barcodes-from-pdf/">reading barcodes from PDF documents</a>. ## Integration with Other IronBarcode Features PDF stamping functionality works seamlessly with other IronBarcode features. Combine it with <a href="/csharp/barcode/how-to/async-multithread/">asynchronous processing</a> for better web application performance: ```csharp // Asynchronous PDF stamping public async Task StampBarcodeAsync(string pdfPath, string barcodeData) { await Task.Run(() => { var barcode = BarcodeWriter.CreateBarcode(barcodeData, BarcodeEncoding.QRCode, 200, 200); barcode.StampToExistingPdfPage(pdfPath, x: 100, y: 100, pageNumber: 1); }); } ``` Additionally, leverage IronBarcode's <a href="/csharp/barcode/how-to/image-correction/">image correction features</a> when working with scanned PDFs that might need enhancement before or after barcode stamping. ## Troubleshooting Common Issues If encountering issues while stamping barcodes on PDFs, here are solutions: 1. **Coordinate Issues:** PDF coordinates start from bottom-left corner, not top-left 2. **Password-Protected PDFs:** Ensure correct password parameter for encrypted PDFs 3. **Large File Sizes:** For optimization and handling tips, see our <a href="/csharp/barcode/troubleshooting/barcode-not-recognized/">troubleshooting guide</a> 4. **Font or Encoding Issues:** For special characters or Unicode, check our <a href="/csharp/barcode/how-to/writing-in-unicode/">writing Unicode barcodes</a> guide Following these guidelines and leveraging IronBarcode's PDF stamping capabilities enables efficient barcode addition to existing PDF documents while maintaining high performance and code quality.

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Stamp barcodes onto existing PDF documents in C# using IronBarcode's CreateBarcode method with StampToExistingPdfPage for single pages or StampToExistingPdfPages for multiple pages, specifying coordinates and page numbers.

This example demonstrates generating a barcode using IronBarcode's CreateBarcode and stamping it onto an existing PDF page. Supply the PDF path, position coordinates, and page number.

StampToExistingPdfPage StampToExistingPdfPages

How Do I Stamp a Barcode on an Existing PDF Page?

Apart from exporting barcodes as PDF, IronBarcode enables stamping the GeneratedBarcode directly onto existing PDF documents. This feature is useful when adding tracking codes, inventory labels, or document identifiers to existing reports, invoices, or forms. The following code snippet demonstrates this task.

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");

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")

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")

What Parameters Does StampToExistingPdfPage Require?

StampToExistingPdfPage() GeneratedBarcode

The code snippet calls the StampToExistingPdfPage method to stamp the object onto the PDF document. This method provides flexibility while maintaining simplicity. Below are the method parameters:

• pdfFilePath: A System.String representing the PDF document path (relative or absolute).
• x: A System.Double for horizontal position in pixels from the left edge.
• y: A System.Double for vertical position in pixels from the bottom edge.
• pageNumber: A System.Int32 indicating the page (1-indexed, first page is 1).
• password: A System.String for password-protected PDFs (optional).

When Should I Use StampToExistingPdfPage?

Running the code snippet stamps the GeneratedBarcode directly into the PDF document without intermediate saving. This method suits scenarios requiring:

StampToExistingPdfPages() GeneratedBarcode

• Unique tracking codes on shipping labels or delivery documents
• Batch numbers on manufacturing reports
• Document control numbers on legal or regulatory forms
• QR codes for digital authentication or quick access links

The direct stamping approach saves processing time and eliminates temporary files. For information on different barcode types, see the supported barcode formats guide.

How Do I Stamp a Barcode on Multiple PDF Pages?

Sometimes the same barcode needs stamping on multiple pages. Common uses include applying document identifiers to every page of multi-page reports, adding version control codes throughout technical documents, or inserting security barcodes on each page of confidential materials. Instead of looping the single-page method, use the StampToExistingPdfPages method on the GeneratedBarcode object. The following code snippet demonstrates this method.

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");

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")

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")

For flexibility, use LINQ to generate page ranges dynamically:

// Stamp on all even pages from 2 to 10
var evenPages = Enumerable.Range(1, 10).Where(x => x % 2 == 0).ToList();
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x: 200, y: 100, evenPages, "password");

// Stamp on the first and last 3 pages of a 20-page document
var selectedPages = new List<int> { 1, 2, 3, 18, 19, 20 };
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x: 200, y: 100, selectedPages, "password");

// Stamp on all even pages from 2 to 10
var evenPages = Enumerable.Range(1, 10).Where(x => x % 2 == 0).ToList();
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x: 200, y: 100, evenPages, "password");

// Stamp on the first and last 3 pages of a 20-page document
var selectedPages = new List<int> { 1, 2, 3, 18, 19, 20 };
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x: 200, y: 100, selectedPages, "password");

Imports System.Linq

' Stamp on all even pages from 2 to 10
Dim evenPages = Enumerable.Range(1, 10).Where(Function(x) x Mod 2 = 0).ToList()
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x:=200, y:=100, evenPages, "password")

' Stamp on the first and last 3 pages of a 20-page document
Dim selectedPages = New List(Of Integer) From {1, 2, 3, 18, 19, 20}
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x:=200, y:=100, selectedPages, "password")

Imports System.Linq

' Stamp on all even pages from 2 to 10
Dim evenPages = Enumerable.Range(1, 10).Where(Function(x) x Mod 2 = 0).ToList()
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x:=200, y:=100, evenPages, "password")

' Stamp on the first and last 3 pages of a 20-page document
Dim selectedPages = New List(Of Integer) From {1, 2, 3, 18, 19, 20}
myBarcode.StampToExistingPdfPages("pdf_file_path.pdf", x:=200, y:=100, selectedPages, "password")

What Parameters Does StampToExistingPdfPages Accept?

Below are the method parameters:

• pdfFilePath: A System.String representing the PDF document path.
• x: A System.Double for horizontal position in pixels.
• y: A System.Double for vertical position in pixels.
• pageNumbers: An IEnumerable<System.Int32> of pages to stamp (1-indexed).
• password: A System.String for password-protected PDFs (optional).

StampToExistingPdfPages() StampToExistingPdfPage() GeneratedBarcode

Why Use StampToExistingPdfPages Instead of Looping?

This method provides efficient barcode stamping on multiple pages without manual iteration, improving code readability and performance. The internal implementation optimizes PDF processing, resulting in:

• Faster execution: PDF opened and processed once, not multiple times
• Lower memory usage: Efficient resource management for large PDFs
• Cleaner code: No manual loop and error handling management
• Atomic operations: All pages stamped in single operation

Advanced Stamping Techniques

Customizing Barcode Appearance Before Stamping

Before stamping your barcode onto a PDF, customize its appearance. IronBarcode offers extensive customization options:

GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("INVOICE-2024-001", BarcodeEncoding.Code128, 250, 80);

// Customize the appearance
myBarcode.AddAnnotationTextAboveBarcode("Invoice Number");
myBarcode.AddAnnotationTextBelowBarcode("Scan for digital copy");
myBarcode.SetMargins(10);
myBarcode.ChangeBarCodeColor(IronSoftware.Drawing.Color.DarkBlue);

// Now stamp the customized barcode
myBarcode.StampToExistingPdfPage("invoice.pdf", x: 450, y: 700, pageNumber: 1);

GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("INVOICE-2024-001", BarcodeEncoding.Code128, 250, 80);

// Customize the appearance
myBarcode.AddAnnotationTextAboveBarcode("Invoice Number");
myBarcode.AddAnnotationTextBelowBarcode("Scan for digital copy");
myBarcode.SetMargins(10);
myBarcode.ChangeBarCodeColor(IronSoftware.Drawing.Color.DarkBlue);

// Now stamp the customized barcode
myBarcode.StampToExistingPdfPage("invoice.pdf", x: 450, y: 700, pageNumber: 1);

Working with Different Barcode Types

Different scenarios require different barcode types. QR codes suit URLs and large data sets, while Code128 works for alphanumeric identifiers. Learn more about creating QR codes or explore other formats:

// QR Code for contact information
var qrCode = BarcodeWriter.CreateBarcode("BEGIN:VCARD\nFN:John Doe\nTEL:555-1234\nEND:VCARD", 
    BarcodeEncoding.QRCode, 150, 150);
qrCode.StampToExistingPdfPage("businesscard.pdf", x: 400, y: 50, pageNumber: 1);

// Data Matrix for product tracking
var dataMatrix = BarcodeWriter.CreateBarcode("PROD-2024-BATCH-789", 
    BarcodeEncoding.DataMatrix, 100, 100);
dataMatrix.StampToExistingPdfPage("product_sheet.pdf", x: 50, y: 750, pageNumber: 1);

// QR Code for contact information
var qrCode = BarcodeWriter.CreateBarcode("BEGIN:VCARD\nFN:John Doe\nTEL:555-1234\nEND:VCARD", 
    BarcodeEncoding.QRCode, 150, 150);
qrCode.StampToExistingPdfPage("businesscard.pdf", x: 400, y: 50, pageNumber: 1);

// Data Matrix for product tracking
var dataMatrix = BarcodeWriter.CreateBarcode("PROD-2024-BATCH-789", 
    BarcodeEncoding.DataMatrix, 100, 100);
dataMatrix.StampToExistingPdfPage("product_sheet.pdf", x: 50, y: 750, pageNumber: 1);

' QR Code for contact information
Dim qrCode = BarcodeWriter.CreateBarcode("BEGIN:VCARD" & vbLf & "FN:John Doe" & vbLf & "TEL:555-1234" & vbLf & "END:VCARD", 
    BarcodeEncoding.QRCode, 150, 150)
qrCode.StampToExistingPdfPage("businesscard.pdf", x:=400, y:=50, pageNumber:=1)

' Data Matrix for product tracking
Dim dataMatrix = BarcodeWriter.CreateBarcode("PROD-2024-BATCH-789", 
    BarcodeEncoding.DataMatrix, 100, 100)
dataMatrix.StampToExistingPdfPage("product_sheet.pdf", x:=50, y:=750, pageNumber:=1)

' QR Code for contact information
Dim qrCode = BarcodeWriter.CreateBarcode("BEGIN:VCARD" & vbLf & "FN:John Doe" & vbLf & "TEL:555-1234" & vbLf & "END:VCARD", 
    BarcodeEncoding.QRCode, 150, 150)
qrCode.StampToExistingPdfPage("businesscard.pdf", x:=400, y:=50, pageNumber:=1)

' Data Matrix for product tracking
Dim dataMatrix = BarcodeWriter.CreateBarcode("PROD-2024-BATCH-789", 
    BarcodeEncoding.DataMatrix, 100, 100)
dataMatrix.StampToExistingPdfPage("product_sheet.pdf", x:=50, y:=750, pageNumber:=1)

Error Handling and Best Practices

Implement proper error handling when working with PDF stamping operations:

try
{
    GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("DOCUMENT-ID-12345", 
        BarcodeEncoding.Code128, 200, 60);
    
    // Verify the PDF exists before attempting to stamp
    if (File.Exists("target.pdf"))
    {
        myBarcode.StampToExistingPdfPage("target.pdf", x: 100, y: 100, pageNumber: 1);
        Console.WriteLine("Barcode stamped successfully!");
    }
    else
    {
        Console.WriteLine("PDF file not found!");
    }
}
catch (Exception ex)
{
    Console.WriteLine($"Error stamping barcode: {ex.Message}");
    // Log the error or handle it appropriately
}

try
{
    GeneratedBarcode myBarcode = BarcodeWriter.CreateBarcode("DOCUMENT-ID-12345", 
        BarcodeEncoding.Code128, 200, 60);
    
    // Verify the PDF exists before attempting to stamp
    if (File.Exists("target.pdf"))
    {
        myBarcode.StampToExistingPdfPage("target.pdf", x: 100, y: 100, pageNumber: 1);
        Console.WriteLine("Barcode stamped successfully!");
    }
    else
    {
        Console.WriteLine("PDF file not found!");
    }
}
catch (Exception ex)
{
    Console.WriteLine($"Error stamping barcode: {ex.Message}");
    // Log the error or handle it appropriately
}

Imports System
Imports System.IO

Try
    Dim myBarcode As GeneratedBarcode = BarcodeWriter.CreateBarcode("DOCUMENT-ID-12345", BarcodeEncoding.Code128, 200, 60)

    ' Verify the PDF exists before attempting to stamp
    If File.Exists("target.pdf") Then
        myBarcode.StampToExistingPdfPage("target.pdf", x:=100, y:=100, pageNumber:=1)
        Console.WriteLine("Barcode stamped successfully!")
    Else
        Console.WriteLine("PDF file not found!")
    End If
Catch ex As Exception
    Console.WriteLine($"Error stamping barcode: {ex.Message}")
    ' Log the error or handle it appropriately
End Try

Imports System
Imports System.IO

Try
    Dim myBarcode As GeneratedBarcode = BarcodeWriter.CreateBarcode("DOCUMENT-ID-12345", BarcodeEncoding.Code128, 200, 60)

    ' Verify the PDF exists before attempting to stamp
    If File.Exists("target.pdf") Then
        myBarcode.StampToExistingPdfPage("target.pdf", x:=100, y:=100, pageNumber:=1)
        Console.WriteLine("Barcode stamped successfully!")
    Else
        Console.WriteLine("PDF file not found!")
    End If
Catch ex As Exception
    Console.WriteLine($"Error stamping barcode: {ex.Message}")
    ' Log the error or handle it appropriately
End Try

Performance Considerations

When working with large PDFs or multiple stamping operations, consider these tips:

1. Batch Operations: Use StampToExistingPdfPages instead of looping StampToExistingPdfPage
2. Barcode Caching: Create once and reuse the GeneratedBarcode object
3. Coordinate Calculation: Pre-calculate consistent position coordinates
4. Memory Management: Process very large PDFs in batches

For advanced scenarios involving reading barcodes from PDFs after stamping, see our guide on reading barcodes from PDF documents.

Integration with Other IronBarcode Features

PDF stamping functionality works seamlessly with other IronBarcode features. Combine it with asynchronous processing for better web application performance:

// Asynchronous PDF stamping
public async Task StampBarcodeAsync(string pdfPath, string barcodeData)
{
    await Task.Run(() =>
    {
        var barcode = BarcodeWriter.CreateBarcode(barcodeData, BarcodeEncoding.QRCode, 200, 200);
        barcode.StampToExistingPdfPage(pdfPath, x: 100, y: 100, pageNumber: 1);
    });
}

// Asynchronous PDF stamping
public async Task StampBarcodeAsync(string pdfPath, string barcodeData)
{
    await Task.Run(() =>
    {
        var barcode = BarcodeWriter.CreateBarcode(barcodeData, BarcodeEncoding.QRCode, 200, 200);
        barcode.StampToExistingPdfPage(pdfPath, x: 100, y: 100, pageNumber: 1);
    });
}

Imports System.Threading.Tasks

' Asynchronous PDF stamping
Public Async Function StampBarcodeAsync(pdfPath As String, barcodeData As String) As Task
    Await Task.Run(Sub()
                       Dim barcode = BarcodeWriter.CreateBarcode(barcodeData, BarcodeEncoding.QRCode, 200, 200)
                       barcode.StampToExistingPdfPage(pdfPath, x:=100, y:=100, pageNumber:=1)
                   End Sub)
End Function

Imports System.Threading.Tasks

' Asynchronous PDF stamping
Public Async Function StampBarcodeAsync(pdfPath As String, barcodeData As String) As Task
    Await Task.Run(Sub()
                       Dim barcode = BarcodeWriter.CreateBarcode(barcodeData, BarcodeEncoding.QRCode, 200, 200)
                       barcode.StampToExistingPdfPage(pdfPath, x:=100, y:=100, pageNumber:=1)
                   End Sub)
End Function

Additionally, leverage IronBarcode's image correction features when working with scanned PDFs that might need enhancement before or after barcode stamping.

Troubleshooting Common Issues

If encountering issues while stamping barcodes on PDFs, here are solutions:

1. Coordinate Issues: PDF coordinates start from bottom-left corner, not top-left
2. Password-Protected PDFs: Ensure correct password parameter for encrypted PDFs
3. Large File Sizes: For optimization and handling tips, see our troubleshooting guide
4. Font or Encoding Issues: For special characters or Unicode, check our writing Unicode barcodes guide

Following these guidelines and leveraging IronBarcode's PDF stamping capabilities enables efficient barcode addition to existing PDF documents while maintaining high performance and code quality.

Hairil Hasyimi Bin Omar

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