created_at2023-02-05 01:14:15.231413
updated_at2023-12-29 01:39:04.250602
descriptionA Rust library for generating and manipulating QR code images in various formats
Sebastien Rousseau (sebastienrousseau)




RustLogs (RLG) logo


A Rust library for generating and manipulating QR code images in various formats 🦀

Made With Love Crates.io Lib.rs Docs.rs License


Welcome to QRC

QRC Banner

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The QR Code Library (QRC) is a comprehensive Rust library designed to create and manipulate QR codes. It offers a wide range of functionalities including generating QR codes in various formats, customizing color schemes, adding image watermarks, and more.


  • Generate QR code images in multiple formats like PNG, JPG, GIF, and SVG,
  • Customize color schemes,
  • Add image watermarks,
  • Easy integration with Rust projects.

Usage Examples

Here are some basic examples of how to use QRC in your Rust projects:

// Create a new QRCode using the QRCode::from_string() function and convert it to a PNG representation
let qrcode = QRCode::from_string(URL.to_string());

// Convert the QRCode into a PNG representation
let png = qrcode.to_png(512);

// Convert the PNG representation of the QRCode into a vector of bytes
let png_data = png.into_raw();
let png_image = ImageBuffer::<Rgba<u8>, Vec<u8>>::from_raw(21, 21, png_data).unwrap();

// Print the PNG representation of the QRCode
println!("fn to_png(): {:?}", png_image.save("qrcode.png"));
match png_image.save("qrcode.png") {
    // Print the path to the PNG representation of the QRCode that was saved to a file called "qrcode.png"
    Ok(_) => println!("png file created: qrcode.png"),
    // Print the path to the PNG representation of the QRCode that was saved to a file called "qrcode.png"
    Err(e) => println!("png file created: qrcode.png: {e}"),

Macros in QRC

The QR Code Library (QRC) offers a set of macros for easy manipulation and generation of QR codes in Rust. Below is the documentation for each macro available in the library.

1. add_image_watermark

  • Description: This macro creates a new instance of the QRCode struct with a watermark image added to an existing image.
  • Usage:
add_image_watermark!(img, watermark);
  • img: An expression representing the main image.
  • watermark: An expression representing the watermark image.

2. qr_code

  • Description: Generates a new QR code instance with the provided data.
  • Usage:
  • data: An expression representing the data to encode in the QR code.

3. qr_code_to

  • Description: Creates a QR code in a specified format (PNG, JPG, or GIF) and size.
  • Usage:
qr_code_to!(data, format, width);
  • data: The data to encode.
  • format: The desired output format ("png", "jpg", or "gif").
  • width: The width of the QR code.

4. resize

  • Description: Sets the size of the QR code.
  • Usage:
resize!(qrcode, size);
  • qrcode: An instance of QRCode.
  • size: The desired size for the QR code.

5. set_encoding_format

  • Description: Sets the encoding format for the data in a QR code.
  • Usage:
set_encoding_format!(qr_code, format);
  • qr_code: An instance of QRCode.
  • format: The encoding format for the QR code data.

6. overlay_image

  • Description: Overlays an image at the center of the QR code.
  • Usage:
overlay_image!(qr_code, image_path);
  • qr_code: QRCode instance to which the image will be overlaid.
  • image_path: Path to the image file to overlay.

7. batch_generate_qr

  • Description: Generates multiple QR codes in one operation.
  • Usage:
  • data_list: A vector of data strings for QR code generation.

8. compress_data_macro

  • Description: Compresses data before encoding it into a QR code.
  • Usage:
  • data: The data to be compressed and encoded.

9. combine_qr_codes

  • Description: Combines multiple QR codes into a single QR code.
  • Usage:
  • codes: An array of QRCode instances to combine.

10. create_dynamic_qr

  • Description: Generates a dynamic QR code that can be updated after creation.
  • Usage:
  • initial_data: The initial data for the QR code.

11. create_multilanguage_qr

  • Description: Generates QR codes with multi-language support.
  • Usage:
create_multilanguage_qr! {
    "en" => "Hello",
    "es" => "Hola",
    "fr" => "Bonjour",
  • Language-data pairs for the QR code.


It takes just a few minutes to get up and running with qrc.


qrc requires Rust 1.71.1 or later.


You can find detailed documentation for QRC on lib.rs, crates.io and docs.rs.

Usage 📖

To use qrc in your project, add the following to your Cargo.toml file:

qrc = "0.0.5"

Add the following to your main.rs file:

extern crate qrc;
use qrc::*;

then you can use the functions in your application code.


QRC comes with a set of examples that you can use to get started. The examples are located in the examples directory of the project. To run the examples, clone the repository and run the following command in your terminal from the project root directory.

cargo run --example example

Semantic Versioning Policy

For transparency into our release cycle and in striving to maintain backward compatibility, QRC follows semantic versioning.


The project is licensed under the terms of both the MIT license and the Apache License (Version 2.0).


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.



A big thank you to all the awesome contributors of QRC for their help and support. A special thank you goes to the Rust Reddit community for providing a lot of useful suggestions on how to improve this project.

Commit count: 10

cargo fmt