How to Generate QR Codes in C# .NET (ASP.NET & QRCoder Tutorial)

QRCoder is a pure C# open-source library that creates QR codes without any external API calls or third-party dependencies in .NET Core.

1. Install NuGet Package

dotnet add package QRCoder

2. C# Implementation

using QRCoder;

QRCodeGenerator qrGenerator = new QRCodeGenerator();
QRCodeData qrCodeData = qrGenerator.CreateQrCode("https://www.pngqr.com", QRCodeGenerator.ECCLevel.Q);
PngByteQRCode qrCode = new PngByteQRCode(qrCodeData);
byte[] qrCodeImage = qrCode.GetGraphic(20);
File.WriteAllBytes("my_qr_code.png", qrCodeImage);