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 = QrCode(4, QrErrorCorrectLevel.L)
                  ..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 (var x = 0; x < qrImage.moduleCount; x++) {
                  for (var 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

barcode - A package that supports many types of scannable codes, include QR.

Demo

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

3.0.2

• Require package web: ^1.0.0.
• Require Dart 3.4 or greater.

3.0.1

• Fix example in README.md.
• Require Dart 2.16 or greater.

3.0.0

• QrImage added to handle image bits.
• QrCode.make() removed
• QrCode.isDark() moved to QrImage
• Added alpha numeric mode support via addAlphaNumeric

2.1.0

• Added numeric mode support via addNumeric

2.0.0

• Expose Mask Pattern as a parameter of QrCode.make()
• Migrated to null safety.
• Require Dart SDK >=2.12.0 <3.0.0.

1.3.0

• Added QrCode.addByteData.
• Added QrCode.fromUint8List.

1.2.1

• Require Dart SDK >=2.6.0 <3.0.0.

1.2.0

• Expose InputTooLongException exception so that applications and libraries can check for data length errors.

1.1.1

• Require Dart SDK >=2.1.0 <3.0.0.
• Fix a bug that fromData doesn't add supplied data.

1.1.0

• Add fromData QrCode factory that allows QrCode initiation without providing typeNumber.

1.0.1

• Support Dart 2 stable.

1.0.0

• Require at least Dart SDK 2.0.0-dev.17.
• Fixed a subtle bug with number handling.

0.1.0+2

• Update README to include basic documentation
• Update pubspec.yaml description

0.1.0+1

• Fix author email.

0.1.0

• Initial release.