Does QRCoder work with .NET Core?

Yes. QRCoder supports .NET Framework 4.0+, .NET Standard 2.0, and .NET 5/6/7/8+. It works in ASP.NET Core, console apps, and cross-platform projects.

Can I add a logo to a QR code with QRCoder?

Yes. QRCoder's ArtQRCode renderer supports logo embedding. Use a high error correction level (H) and the ArtQRCodeGenerator class for the best results.

How do I return a QR code from an ASP.NET endpoint?

Generate the QR code as a byte array, then return it with File(bytes, "image/png") in your controller action. For SVG, use Content(svgString, "image/svg+xml").

Can I generate QR codes in Blazor?

Yes. Use QRCoder in Blazor Server directly. For Blazor WebAssembly, use the QRCode.fun API via HttpClient since QRCoder uses System.Drawing which is not available in WASM.

C# QR Code Library

Generate QR Codes with C#

C# developers can use QRCoder, a popular .NET library, to generate QR codes in ASP.NET, WPF, MAUI, and console applications. No external dependencies required.

Try QR Generator View API Docs

Installation

Install QRCoder via NuGet Package Manager.

NuGet

dotnet add package QRCoder

Package Manager

Install-Package QRCoder

Generate QR Codes with QRCoder

Code examples using the QRCoder library in C#.

Basic QR Code with QRCoder

using QRCoder;

var qrGenerator = new QRCodeGenerator();
var qrData = qrGenerator.CreateQrCode("https://qrcode.fun",
    QRCodeGenerator.ECCLevel.Q);

// PNG output
var qrCode = new PngByteQRCode(qrData);
byte[] pngBytes = qrCode.GetGraphic(20);
File.WriteAllBytes("qrcode.png", pngBytes);

SVG Output

using QRCoder;

var qrGenerator = new QRCodeGenerator();
var qrData = qrGenerator.CreateQrCode("https://qrcode.fun",
    QRCodeGenerator.ECCLevel.Q);

var svgQrCode = new SvgQRCode(qrData);
string svgString = svgQrCode.GetGraphic(20,
    "#1A2B3C", "#FFFFFF");
File.WriteAllText("qrcode.svg", svgString);

ASP.NET Core Endpoint

app.MapGet("/qr", (string data) =>
{
    var qrGenerator = new QRCodeGenerator();
    var qrData = qrGenerator.CreateQrCode(data,
        QRCodeGenerator.ECCLevel.Q);
    var qrCode = new PngByteQRCode(qrData);
    byte[] png = qrCode.GetGraphic(20);

    return Results.File(png, "image/png");
});

QRCode.fun API

Generate QR Codes via API in C#

Call the QRCode.fun API from C# using HttpClient for styled QR codes.

C# API Integration

using System.Net.Http.Json;

var client = new HttpClient();
var payload = new {
    data = "https://qrcode.fun",
    width = 300,
    height = 300,
    type = "png",
    margin = 10,
    dotsOptions = new { color = "#1A2B3C", type = "rounded" },
    cornersSquareOptions = new { color = "#8564C3", type = "extra-rounded" },
    backgroundOptions = new { color = "#FFFFFF" }
};

var response = await client.PostAsJsonAsync(
    "https://qrcode.fun/api/generate-qr-styled", payload);
var result = await response.Content.ReadFromJsonAsync<JsonElement>();
Console.WriteLine(result.GetProperty("data").GetString()?[..50]);

Live QR Code Preview

Try generating a QR code with C# right now.

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QR preview

Native Library vs API

Compare using QRCoder versus the QRCode.fun API.

Feature	QRCoder	QRCode.fun API
Setup complexity	NuGet install	Single HTTP request via HttpClient
Customization	Colors, logos, shapes (ArtQRCode)	Full styling: colors, shapes, logos
Offline support	Yes	Requires internet
Maintenance	NuGet update	Always up-to-date
Output formats	PNG, SVG, PDF, ASCII	PNG, SVG

C# QR Code Use Cases

Common scenarios for QR codes in .NET applications.

ASP.NET Web APIs

Generate QR codes in ASP.NET Core APIs for tickets, invoices, authentication tokens, and product pages.

WPF & MAUI Desktop Apps

Create desktop applications with QR code generation for labels, business cards, and asset tracking.

Azure Functions

Deploy QR generation as serverless Azure Functions triggered by HTTP requests or queue messages.

Reporting & PDF

Embed QR codes into PDF reports and documents using QuestPDF or iTextSharp for payment and tracking.

Frequently Asked Questions

Common questions about generating QR codes with C#.

QRCoder is an open-source .NET library for generating QR codes. It supports multiple output formats including PNG, SVG, PDF, and ASCII art, with no external dependencies.

Start generating QR codes with C#

Use our free generator or integrate the API into your .NET applications.

Open QR Generator Explore API Docs