QR Code Generator

A Library For A Multitude Of Languages.

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Introduction

This project aims to be the best, clearest QR
Code generator library in multiple languages.

Primary Goals

• Flexible options
• Absolute correctness

Secondary Goals

• Compact implementation size
• Good documentation comments

Languages

The library is available in multiple languages
with mostly the same amount of functionality.

   

   

 

 

 

Features

Core

• Significantly shorter code but more documentation
  comments compared to competing libraries.

• Supports encoding all 40 versions (sizes) and all 4 error
  correction levels, as per the QR Code Model 2 standard.

• Output format: Raw modules/pixels of the QR symbol

• Detects finder-like penalty patterns more
  accurately than other implementations.

• Encodes numeric and special-alphanumeric
  strings into less space than general text.

Parameters

• Minimum / Maximum allowed version number can be
  specified, which the library will use to automatically
  choose smallest version in the range that fits the data.

• User can specify mask pattern manually, otherwise
  library will automatically evaluate all 8 masks and
  select the optimal one.

• User can specify absolute error correction level, or
  allow the library to boost it if it doesn't increase the
  version number

• User can create a list of data segments
  manually and add ECI segments.

Advanced    Optional   Java Only 

• Encodes Japanese Unicode text in kanji
  mode to save a lot of space compared
  to UTF-8 bytes.

• Computes optimal segment mode switching
  for text with mixed numeric / alphanumeric
  / general / kanji parts.

Check the project website for more information.

Example   

While the code below is written in Java, the
ports to other languages are designed with
essentially the same API naming / behavior.

import java.awt.image.BufferedImage;
import java.util.List;
import java.io.File;

import javax.imageio.ImageIO;
import io.nayuki.qrcodegen.*;


//  Simple Operation

QrCode codeA = QrCode.encodeText("Hello, world!",QrCode.Ecc.MEDIUM);
BufferedImage image = toImage(codeA,4,10);
ImageIO.write(image,"png",new File("qr-code.png"));


//  Manual Operation

List<QrSegment> segments = QrSegment.makeSegments("3141592653589793238462643383");
QrCode codeB = QrCode.encodeSegments(segments,QrCode.Ecc.HIGH,5,5,2,false);

for(int y = 0;y < codeB.size;y++)
    for(int x = 0;x < codeB.size;x++){
        ...
        paint codeB.getModule(x,y)
        ...
    }