2D Barcode Writer
How to Generate QR Codes Using Aspose.BarCode for .NET

How to Generate QR Codes Using Aspose.BarCode for .NET

This article explains how to generate QR codes in C# using Aspose.BarCode for .NET. QR codes are everywhere—from product packaging and business cards to restaurant menus and digital payments. This guide will help you programmatically create QR codes with custom settings for any application.

Real-World Problem

Businesses, developers, and organizations often need to generate QR codes for sharing URLs, contact info, Wi-Fi access, authentication, or event tickets. Manually generating QR codes is inefficient, and basic tools may lack the customizability or automation required for real-world .NET projects.

Solution Overview

With Aspose.BarCode for .NET, you can generate high-quality QR codes, fully customize their appearance and settings, and export them to any standard image format for use in print or digital workflows—all using a few lines of C# code.

Prerequisites

Before you start, ensure you have:

  1. Visual Studio 2019 or later
  2. .NET 6.0 or later (or .NET Framework 4.6.2+)
  3. Aspose.BarCode for .NET installed via NuGet
  4. Basic knowledge of C#
PM> Install-Package Aspose.BarCode

Step-by-Step Implementation

Step 1: Install and Import Aspose.BarCode

Install the NuGet package and import the required namespaces:

using Aspose.BarCode.Generation;

Step 2: Create the QR Code Generator

Instantiate the generator and set the type to QR:

BarcodeGenerator generator = new BarcodeGenerator(EncodeTypes.QR, "https://yourdomain.com");

Step 3: Customize QR Code Settings

You can adjust QR code properties as needed:

// Set module (pixel) size
generator.Parameters.Barcode.XDimension.Pixels = 8;
// Set error correction level (L, M, Q, H)
generator.Parameters.Barcode.QR.QrErrorLevel = QRErrorLevel.LevelM;
// Set QR version (auto or specific)
generator.Parameters.Barcode.QR.QrVersion = QRVersion.Auto;
// Optional: Set foreground and background color
generator.Parameters.Barcode.BarColor = Color.Black;
generator.Parameters.Barcode.BackColor = Color.White;

Step 4: Generate and Save the QR Code Image

Export the barcode to PNG, JPEG, or any supported format:

generator.Save("qr-code.png", BarCodeImageFormat.Png);

Step 5: Complete Example 

using Aspose.BarCode.Generation;
using System.Drawing; // Required for Color

class Program
{
    static void Main()
    {
        // Create generator for a URL
        BarcodeGenerator generator = new BarcodeGenerator(EncodeTypes.QR, "[https://yourdomain.com](https://yourdomain.com)");
        generator.Parameters.Barcode.XDimension.Pixels = 8;
        generator.Parameters.Barcode.QR.QrErrorLevel = QRErrorLevel.LevelM;
        generator.Parameters.Barcode.QR.QrVersion = QRVersion.Auto;
        generator.Parameters.Barcode.BarColor = Color.Black;
        generator.Parameters.Barcode.BackColor = Color.White;
        generator.Save("qr-code.png", BarCodeImageFormat.Png);
        // Test with a QR scanner to verify the output
    }
}

Use Cases and Applications

  • Share URLs or digital content: QR codes for websites, video, app downloads
  • Authentication/Payments: One-time codes for 2FA or payment workflows
  • Contactless Menus and Tickets: For restaurants, events, travel, and more

Common Challenges and Solutions

Challenge 1: QR code not scanning? Solution: Increase pixel size (XDimension), use sufficient error correction, ensure good color contrast.

Challenge 2: Need non-English or binary content? Solution: Use Unicode or binary codetext, set encoding if required.

Challenge 3: Image looks blurry? Solution: Export at higher pixel size or DPI for print use.

Performance Considerations

  • Choose proper module size for the output medium (screen vs. print)
  • Batch generate QR codes by iterating with new BarcodeGenerator instances
  • Use memory streams for in-memory image output

Best Practices

  1. Test QR readability with common apps and devices
  2. Set error correction level appropriate to your use case
  3. Export to a lossless format (PNG) for best results
  4. Document codetext and parameters for traceability

Advanced Scenarios

1. Generate QR Codes in Memory 

using (var ms = new MemoryStream())
{
    generator.Save(ms, BarCodeImageFormat.Png);
    // Use the in-memory image
}

2. Customize Caption, Size, and Colors 

generator.Parameters.CaptionAbove.Text = "Scan me!";
generator.Parameters.Barcode.BarColor = Color.DarkBlue;
generator.Parameters.Barcode.BackColor = Color.LightYellow;

Conclusion

Aspose.BarCode for .NET makes it easy to create, customize, and export QR codes for any application, from web links to business processes. For more options, visit the Aspose.BarCode API Reference .

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