An mdBook preprocessor that generates and embeds a QR code for your book, powered by fast-qr.

It produces a PNG image during the build and replaces {{QR_CODE}} markers in chapters with an <img> tag pointing to the generated QR code.

Read the documentation here, to see the actual examples in action.

Features

• Generates PNG QR codes using fast-qr
• Structured configuration under [preprocessor.qr] with sub-tables:
  • Configurable RGB/A or hex color options
  • Optional fit width/height for the <img> tag
  • Support for multiple module shapes (see Shapes)
  • Adjustable quiet zone margin
• Supports custom named QR configurations under [preprocessor.qr.custom.*] (see Custom Configuration)

Installation

From crates.io:

cargo install mdbook-qr

From source (in this repository):

cargo install --path .

Ensure the mdbook-qr binary is available on your PATH.

Quick Start

Add to your book.toml:

[preprocessor.qr]
enable = true
url = "https://example.com"
qr-path = "src/qr.png"
margin = 2
background = "#FFFFFFFF"
module = "#000000FF"

[preprocessor.qr.fit]
width = 256
height = 256

[preprocessor.qr.shape]
circle = true

Then, in any Markdown file:

{{QR_CODE}}

During the build, this is replaced with:

<img src="./qr.png" alt="QR code" style="width:256px;height:256px;" loading="eager">

...and rendered as:

License

Licensed under the MIT License

Author

CompEng0001