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QRCoder is a simple library, written in C#.NET, which enables you to create QR codes. It hasn't any dependencies to external libraries¹, is available as package on NuGet and supports .NET Framework, .NET Core, .NET Standard and .NET. A full list of supported target frameworks can be found here.

Feel free to grab-up/fork the project and make it better!

For more information see: QRCode Wiki | Creator's blog (english) | Creator's blog (german)

The release notes for the current and all past releases can be read here: 📄 Release Notes

QRCoder is a project by Raffael Herrmann and was first released in 10/2013. It's licensed under the MIT license.

Either checkout this Github repository or install QRCoder via NuGet Package Manager. If you want to use NuGet just search for "QRCoder" or run the following command in the NuGet Package Manager console:

PM> Install-Package QRCoder

The NuGet feed contains only major/stable releases. If you want the latest functions and features, you can use the CI builds via Github packages. (More information on how to use Github Packages in Nuget Package Manager can be found here.)

You only need a couple lines of code, to generate your first QR code.

using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
using (QRCodeData qrCodeData = qrGenerator.CreateQrCode("The text which should be encoded.", QRCodeGenerator.ECCLevel.Q))
using (PngByteQRCode qrCode = new PngByteQRCode(qrCodeData))
{
    byte[] qrCodeImage = qrCode.GetGraphic(20);
}

There are a plenty of other options. So feel free to read more on that in our wiki: Wiki: How to use QRCoder

Besides the normal PngByteQRCode-class (which is shown in the example above) for creating QR codes in Bitmap format, there are some more QR code rendering classes, each for another special purpose.

• QRCode
• ArtQRCode
• AsciiQRCode
• Base64QRCode
• BitmapByteQRCode
• PdfByteQRCode
• PngByteQRCode
• PostscriptQRCode
• SvgQRCode
• UnityQRCode (via QRCoder.Unity)
• XamlQRCode (via QRCoder.Xaml)

Note: Please be aware that not all renderers are available on all target frameworks. Please check the compatibility table in our wiki, to see if a specific renderer is available on your favourite target framework.

For more information about the different rendering types click on one of the types in the list above or have a look at: Wiki: Advanced usage - QR-Code renderers

Technically QR code is just a visual representation of a text/string. Nevertheless most QR code readers can read "special" QR codes which trigger different actions.

For example: WiFi-QRcodes which, when scanned by smartphone, let the smartphone join an access point automatically.

This "special" QR codes are generated by using special structured payload string, when generating the QR code. The PayloadGenerator.cs class helps you to generate this payload strings. To generate a WiFi payload for example, you need just this one line of code:

PayloadGenerator.WiFi wifiPayload = new PayloadGenerator.WiFi("MyWiFi-SSID", "MyWiFi-Pass", PayloadGenerator.WiFi.Authentication.WPA);

To generate a QR code from this payload, just call the "ToString()"-method and pass it to the QRCoder.

//[...]
QRCodeData qrCodeData = qrGenerator.CreateQrCode(wifiPayload.ToString(), QRCodeGenerator.ECCLevel.Q);
//[...]

You can also use overloaded method that accepts Payload as parameter. Payload generator can have QR Code Version set (default is auto set), ECC Level (default is M) and ECI mode (default is automatic detection).

//[...]
QRCodeData qrCodeData = qrGenerator.CreateQrCode(wifiPayload);
//[...]

Or if you want to override ECC Level set by Payload generator, you can use overloaded method, that allows setting ECC Level.

//[...]
QRCodeData qrCodeData = qrGenerator.CreateQrCode(wifiPayload, QRCodeGenerator.ECCLevel.Q);
//[...]

You can learn more about the payload generator in our Wiki.

The PayloadGenerator supports the following types of payloads:

• BezahlCode
• Bitcoin-Like cryptocurrency (Bitcoin, Bitcoin Cash, Litecoin) payment address
• Bookmark
• Calendar events (iCal/vEvent)
• ContactData (MeCard/vCard)
• Geolocation
• Girocode
• Mail
• MMS
• Monero address/payment
• One-Time-Password
• Phonenumber
• RussiaPaymentOrder (ГОСТ Р 56042-2014)
• Shadowsocks configuration
• Skype call
• SlovenianUpnQr
• SMS
• SwissQrCode (ISO-20022)
• URL
• WhatsAppMessage
• WiFi

⁽¹⁾ Depending on the targeted framework the .NET libraries System.Drawing.Common and System.Text.Encoding.CodePages will used as package dependencies.