Meziantou.Framework.QRCode

Meziantou.Framework.QRCode

QR code generation library with SVG and console renderers. Implements the QR code specification from scratch with support for standard QR, Micro QR, and Rectangular Micro QR (rMQR) codes.

Supported QR Code Types

Usage

Generate QR codes (Standard, Micro QR, rMQR)

// Standard QR code
var standardQr = QRCode.Create("HELLO WORLD", ErrorCorrectionLevel.H);

// Micro QR code (smaller, single finder pattern)
var microQr = QRCode.CreateMicroQR("12345", ErrorCorrectionLevel.L);

// Rectangular Micro QR code (narrow rectangular shape)
var rmqr = QRCode.CreateRMQR("https://www.meziantou.net", ErrorCorrectionLevel.M);

// Format info
Console.WriteLine($"{standardQr.Type} {standardQr.Width}x{standardQr.Height}");
Console.WriteLine($"{microQr.Type} {microQr.Width}x{microQr.Height}");
Console.WriteLine($"{rmqr.Type} {rmqr.Width}x{rmqr.Height}");

Render as SVG

var svg = standardQr.ToSvg();
var microSvg = microQr.ToSvg(new QRCodeSvgOptions { ModuleSize = 2, QuietZoneModules = 2 });
var rmqrSvg = rmqr.ToSvg(new QRCodeSvgOptions { ModuleSize = 2, QuietZoneModules = 2 });

var customSvg = standardQr.ToSvg(new QRCodeSvgOptions
{
    ModuleSize = 10,
    QuietZoneModules = 4,
    DarkColor = "#000000",
    LightColor = "#ffffff",
});

Render to console

standardQr.WriteToConsole();
var standardText = standardQr.ToConsoleString();
var microText = microQr.ToConsoleString(new QRCodeConsoleOptions
{
    QuietZoneModules = 1,
    ModuleWidth = 2,
    ModuleHeight = 2, // 2x bigger output that can look more square on many terminals
});

var rmqrText = rmqr.ToConsoleString(new QRCodeConsoleOptions
{
    QuietZoneModules = 1,
    ModuleWidth = 2,
    ModuleHeight = 2,
});

Content helpers

// WiFi
var wifi = QRCodePayload.Wifi("MyNetwork", "password123", WifiAuthentication.WPA);

// vCard
var vcard = QRCodePayload.VCard("Doe", "John", phone: "+1234567890", email: "[email protected]");

// MeCard (compact contact format)
var mecard = QRCodePayload.MeCard("Doe", "John", phone: "+1234567890");

// Email
var email = QRCodePayload.Email("[email protected]", subject: "Hello");

// Phone
var phone = QRCodePayload.Phone("+1234567890");

// SMS
var sms = QRCodePayload.Sms("+1234567890", "Hello!");

// Geolocation
var geo = QRCodePayload.Geolocation(48.8566, 2.3522);

// Calendar event
var evt = QRCodePayload.CalendarEvent("Meeting",
    new DateTime(2025, 6, 15, 14, 0, 0, DateTimeKind.Utc),
    new DateTime(2025, 6, 15, 15, 0, 0, DateTimeKind.Utc),
    location: "Room 42");

// OTP Auth (2FA setup)
var otp = QRCodePayload.OneTimePassword(OneTimePasswordType.Totp,
    "JBSWY3DPEHPK3PXP", "[email protected]", issuer: "MyApp");

// Bitcoin payment
var btc = QRCodePayload.Bitcoin("1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa", amount: 0.05m);

// SEPA payment (EPC QR)
var sepa = QRCodePayload.SepaPayment("Example", "DE00000000000000000000", 12.50m,
    remittanceText: "Donation");