A QR code generation library for Dart and Flutter.

Features

• Supports QR code versions 1 - 40
• Error correction / redundancy

Getting started

To start, import the dependency in your code:

import 'package:qr/qr.dart';

To build your QR code data you should do so as such:

final qrCode = new QrCode(4, QrErrorCorrectLevel.L);
qrCode.addData("Hello, world in QR form!");
final qrImage = QrImage(qrCode);

Now you can use your qrImage instance to render a graphical representation of the QR code. A basic implementation would be as such:

for (int x = 0; x < qrImage.moduleCount; x++) {
  for (int y = 0; y < qrImage.moduleCount; y++) {
    if (qrImage.isDark(y, x)) {
      // render a dark square on the canvas
    }
  }
}

See the example directory for further details.

Pre-made UI libraries

The following libraries use qr.dart to generate QR codes for you out of the box:

QR - Flutter - A Flutter Widget to render QR codes

QR - AngularDart - An AngularDart component to render QR codes

Demo

A working demo can be found here: https://kevmoo.github.io/qr.dart/