A self-contained QR Code generator library and CLI tool for the D programming language. No external dependencies required.

Generate QR Codes and save them as PNG, SVG, SVGZ, or PPM files, or display them directly in your terminal as ASCII art.

Based on Project Nayuki's implementation.

Add this library to your project using: dub add qr

import qr;
QrCode("Hello, world!").saveAs("test.png");

/* same as above
QrCode qrcode = "Hello, world!";
qrcode.saveAs("test.png");
*/

You can set extra options for generator:

• ecl: Error Correction Level.
• mask: Mask pattern.
• boostEcl: Boost the error correction level (without increasing the size of the QR Code).

For example:

import qr;
QrCode("Hello, world!", ecl: ErrorCorrectionLevel.HIGH).writeln; // Print QR Code to stdout

You can save the QR Code to a file (PNG, SVG, PPM) with some options:

• moduleSize: Size of each module (pixel)
• padding: Padding around the QR Code (in modules)
• foreground: Foreground color (default: #000000)
• background: Background color (default: #FFFFFF)

import qr;
QrCode("Hello, world!").saveAs("test.png", moduleSize: 10, foreground: "#ff0000"); // Save a red QR Code as PNG

You can also access the raw QR Code data:

import qr;
QrCode qrcode = "Hello, world!";
qrcode.size.writeln; // Print the size (number of modules per side) of the QR Code
qrcode[0,0].writeln; // Print the module at position (0, 0) (true = black, false = white)

You can print QR Code as ASCII art:

import qr;
QrCode("Hello, world!").writeln; // Print QR Code as ASCII art
QrCode("Hello, world!").toString(dense: true).writeln; // Print QR Code as ASCII art, dense!

The project includes a versatile CLI tool called qrc.

Usage: qrc [options] "data"

Examples:
  qrc "hello world"                # Print QR code to terminal
  qrc "hello world" -o qr.png      # Save as PNG image
  qrc "data" -f dense              # Use compact terminal representation
  qrc "secret" -f svg              # Print QR code as SVG

Options:
-o  --output Output file (if omitted, results are printed to stdout)
-f  --format Output format: png, svg, svgz, ppm, ascii, dense
-m    --mask Mask pattern (0-7, or -1 for auto)
-e     --ecl Error correction level: low, medium_low, medium_high, high
     --boost Boost error correction level (default: true). Use --boost=false to disable.
-p --padding Quiet zone size in modules (default: 2)
-s    --size Module size in pixels for images (default: 10)
        --fg Foreground color hex (e.g. #000000) (default: #000000)
        --bg Background color hex (e.g. #FFFFFF) (default: #FFFFFF)
-h    --help This help information.

Generate a standard ASCII QR code:

qrc "https://github.com/trikko/qr"

Use the dense format for a more compact representation (uses Unicode half-block characters):

qrc "https://github.com/trikko/qr" -f dense

Save as a PNG with custom colors:

qrc "https://github.com/trikko/qr" -o logo.png --size 20 --fg "#1a2b3c" --bg "#f0f0f0"

This project is licensed under the MIT License. See the LICENSE file for details.