QRCoder.Core 2.0.0

QRCoder.Core

A cross-platform .NET library for QR Code generation using SkiaSharp. Compatible with Windows, Linux, macOS, and mobile (Xamarin / MAUI).

Based on QRCoder. Supports .NET Standard 2.1, .NET 8.0, .NET 10.0, and .NET Framework 4.8.

Quick Start

using QRCoder.Core;

// Generate QR code data
using var generator = new QRCodeGenerator();
using var data = generator.CreateQrCode("https://github.com/afonsoft/QRCoder.Core",
    QRCodeGenerator.ECCLevel.M);

// Render as PNG bytes (cross-platform, no System.Drawing needed)
using var png = new PngByteQRCode(data);
byte[] pngBytes = png.GetGraphic(10);
File.WriteAllBytes("qrcode.png", pngBytes);

Output Formats

Format Class Example
PNG PngByteQRCode new PngByteQRCode(data).GetGraphic(10) → byte[]
SVG SvgQRCode new SvgQRCode(data).GetGraphic(10) → string
PDF PdfByteQRCode new PdfByteQRCode(data).GetGraphic(5) → byte[]
ASCII ASCIIQRCode new ASCIIQRCode(data).GetGraphic(1) → string
Base64 Base64QRCode new Base64QRCode(data).GetGraphic(10) → string
SKBitmap QRCode new QRCode(data).GetGraphic(10) → SKBitmap
Postscript PostscriptQRCode new PostscriptQRCode(data).GetGraphic(5) → string
Artistic ArtQRCode new ArtQRCode(data).GetGraphic(10) → SKBitmap
BMP BitmapByteQRCode new BitmapByteQRCode(data).GetGraphic(10) → byte[]

Multiple Formats Example

using QRCoder.Core;

using var gen = new QRCodeGenerator();
using var data = gen.CreateQrCode("Hello World", QRCodeGenerator.ECCLevel.M);

// SVG
using var svg = new SvgQRCode(data);
string svgString = svg.GetGraphic(10);

// ASCII (terminal)
using var ascii = new ASCIIQRCode(data);
Console.WriteLine(ascii.GetGraphic(1));

// PDF
using var pdf = new PdfByteQRCode(data);
byte[] pdfBytes = pdf.GetGraphic(5);

// With custom colors
using var qr = new QRCode(data);
using var bitmap = qr.GetGraphic(10, "#1a1a2e", "#e0e0e0");

Payload Types

Generate formatted QR code content for common use cases:

using QRCoder.Core;

using var gen = new QRCodeGenerator();

// Wi-Fi
var wifi = new PayloadGenerator.WiFi("MyNetwork", "MyPassword",
    PayloadGenerator.WiFi.Authentication.WPA);
using var wifiData = gen.CreateQrCode(wifi.ToString(), QRCodeGenerator.ECCLevel.M);

// URL
var url = new PayloadGenerator.Url("https://github.com/afonsoft/QRCoder.Core");
using var urlData = gen.CreateQrCode(url.ToString(), QRCodeGenerator.ECCLevel.M);

// Email
var mail = new PayloadGenerator.Mail("test@example.com", "Subject", "Body");
using var mailData = gen.CreateQrCode(mail.ToString(), QRCodeGenerator.ECCLevel.M);

// Phone Number
var phone = new PayloadGenerator.PhoneNumber("+1234567890");
using var phoneData = gen.CreateQrCode(phone.ToString(), QRCodeGenerator.ECCLevel.M);

// Contact Card (vCard)
var contact = new PayloadGenerator.ContactData(
    PayloadGenerator.ContactData.ContactOutputType.VCard3,
    "Doe", "John", phone: "+1234567890", email: "john@example.com");
using var contactData = gen.CreateQrCode(contact.ToString(), QRCodeGenerator.ECCLevel.M);

Supported payloads: URL, WiFi, Mail, SMS, PhoneNumber, MMS, Geolocation, CalendarEvent, ContactData, Bitcoin, Girocode, BezahlCode, SwissQrCode, OneTimePassword, ShadowSocksConfig, Bookmark, SkypeCall, WhatsAppMessage, and more.

Error Correction Levels

Level Recovery Use Case
ECCLevel.L ~7% Maximum data capacity
ECCLevel.M ~15% General purpose (recommended)
ECCLevel.Q ~25% Higher reliability
ECCLevel.H ~30% Maximum recovery (logos, artistic QR)

Documentation & Source

No packages depend on QRCoder.Core.

Release version 2.0.0

.NET Framework 4.8

.NET Standard 2.1

.NET 10.0

.NET 8.0

Version Downloads Last updated
2.0.0 2 05/17/2026
1.0.8 5 02/21/2026
1.0.3 13 12/23/2024
1.0.2 12 01/23/2025
1.0.1 11 01/23/2025
1.0.0 11 01/23/2025