Nerdbank.QRCodes

A simple library for QR code encoding/decoding

Features

• Decode a QR code (using the excellent ZXing.Net library, Windows only) from a high quality render or a photo with a QR code somewhere in the image.
• Encode data in a QR code (using the excellent QRCoder library) supporting several graphic formats (some Windows only) and even as ASCII art.

Usage

Create a QR code

There are lots of options for customizing QR codes including style, image in the center, colors, and output image format. Following is a basic example.

using QRCoder;

QREncoder encoder = new();
QRCodeGenerator generator = new();
QRCodeData data = generator.CreateQrCode("https://some.url", encoder.ECCLevel);
encoder.Encode(data, "some.png", traceSource: null);

Decode a QR code

Decoding a QR code is very straightforward.

using Bitmap bitmap = (Bitmap)Image.FromFile("some.jpg");
if (QRDecoder.TryDecode(bitmap, out string? data))
{
	Console.WriteLine(data);
}

Today this requires running on Windows.