Scan QR Code in C#.

Quick Response (QR) codes are two-dimensional barcodes that store information in a matrix of black squares on a white background. QR codes can store various types of data, including numeric, alphanumeric, binary, etc. In this blog post, we will learn how to scan a QR code in C#.

This article covers the following topics:

C# QR Code Scanner API

We will use the Aspose.BarCode for .NET API to scan QR codes as well as various other types of barcodes. It is a powerful library that can be used to scan QR codes from images or directly from a webcam.

Please either download the DLL for the API or install it using NuGet.

PM> Install-Package Aspose.BarCode

Scan QR Code in C#

We can easily scan a QR code by following the steps below:

  1. Initialize an object of the BarCodeReader class along with the DecodeType parameter.
  2. Create an instance of the BarCodeResult class.
  3. Scan the QR code and get the result text.

The following code sample shows how to scan a QR code in C#.

Scan QR Code from a Stream in C#

We can also read a QR code from a stream by following the steps below:

  1. Declare an instance of the BarcodeReader class and set the DecodeType property.
  2. Instantiate a BarCodeResult type object.
  3. Scan the QR Code and retrieve the output text.

The code sample below shows how to scan a QR code from a stream in C#.

Get a Free License

You can get a free temporary license to test all of the features of the API without any evaluation limitations.

QR Code Scanner Online

You may scan a QR code online using the camera with this free online QR Scanner web app developed using this API.

QR Code Reader – Free Learning Resources

Besides scanning QR codes, learn more about generating and reading barcodes and explore other features of the API using the resources below:


In this article, you have learned how to scan a QR code from a file or a stream with a few API calls. Moreover, we have introduced a web-based tool to scan QR codes online. In case of any ambiguity, please feel free to contact us on our free support forum.

See Also