Documentation

Everything about qrkude

Start with the guide if QR codes are new to you. Every library page explains installation, examples and its full API.

Learn

How QR codes work

This guide explains how a QR code works, what you can change without breaking it, and how QRKude helps you check the result. You do not need to know anything about QR codes to read it. Each section stands on its own, so

Learn

Style reference

Every QRKude package describes a design with the same style document: a small JSON object. This page shows every option with pictures, its default value and its allowed range. If you are new to QR codes, read the guide f

Libraries

The same style gives the same QR code in every one of them.

JavaScript

Browsers and Node, canvas, web component

Python

SVG and PNG, command-line tool

Rust

no_std, raster, PNG

Flutter

QRKudeView widget, PNG export

Dart

Pure Dart, VM and web

Qt 5 and 6, widgets and QML

Arduino

ESP32, RP2040, AVR, any GFX display

ESP-IDF

Component with Kconfig

LVGL

Widget for LVGL 8 and 9

Reference library, no malloc

Reference

Specification

This document defines what every QRKude implementation must do. The C library in `core/` is the reference implementation; the conformance vectors in `spec/vectors/` are generated from it. A port is conformant when it rep

Contributing

Thanks for helping! QRKude promises that the same style document produces the same QR code in every language. Most of the rules below exist to keep that promise.