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

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

Documentation & Source

• Repository: https://github.com/afonsoft/QRCoder.Core
• Usage Guide: https://github.com/afonsoft/QRCoder.Core/blob/main/docs/en-US/usage-guide.md
• Issues: https://github.com/afonsoft/QRCoder.Core/issues
• License: MIT