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How to Generate QR Codes in Python

🗂 Category: PROGRAMMING
🕒 Date: 2025-12-02 | ⏱️ Read time: 7 min read

---

QR (Quick Response) codes are two-dimensional barcodes that have become ubiquitous for sharing information quickly, from website URLs to Wi-Fi credentials. With Python, generating your own QR codes is a straightforward process, thanks to powerful and easy-to-use libraries.

This tutorial will guide you through using the qrcode package to create both simple and customized QR codes. By the end, you'll be able to integrate QR code generation into any of your Python projects.

#### What You'll Learn:

• How to install the necessary Python package.
• How to create a basic QR code with a single line of code.
• How to use the QRCode class for advanced customization, including size, border, error correction, and color.

---

Step 1: Installation

To get started, you need to install the qrcode library. This package also requires an image processing library to create and save the QR code as an image file. We'll use Pillow, which can be installed along with the main package.

Open your terminal or command prompt and run the following command:

pip install "qrcode[pil]"

This command installs both the qrcode library and the Pillow dependency, ensuring you have everything you need to generate and save image files.

---

Step 2: Creating a Simple QR Code

The quickest way to generate a QR code is by using the make() function. This is perfect for when you need a standard QR code without any special configurations.

Let's create a QR code that encodes the URL to the official Python website.

• Create a new Python file (e.g., create_qr.py).
• Add the following code:

import qrcode

# The data you want to encode in the QR code
data = "https://www.python.org"

# Generate the QR code image
# The make() function handles the entire process
img = qrcode.make(data)

# Save the generated image to a file
img.save("basic_python_qr.png")

print("QR code generated successfully and saved as 'basic_python_qr.png'")

When you run this noscript, it will create a file named basic_python_qr.png in the same directory. If you scan this QR code with your phone, it will take you to the Python website.

---

Step 3: Advanced Customization

For more control over the appearance and functionality of your QR code, you can use the QRCode class. This allows you to configure several parameters:

• version: An integer from 1 to 40 that controls the size of the QR Code. A larger version number means the code can hold more data.
• error_correction: Controls how much of the QR code can be damaged or obscured while still being readable. There are four levels:
ERROR_CORRECT_L: About 7% or less errors can be corrected.
ERROR_CORRECT_M (default): About 15% or less.
ERROR_CORRECT_Q: About 25% or less.
ERROR_CORRECT_H: About 30% or less.
• box_size: Controls how many pixels each "box" of the QR code is.
• border: Controls the thickness of the white border around the code.

Let's create a customized QR code with a blue color, a thicker border, and high error correction.

import qrcode

# Data to be encoded
custom_data = "This is a custom QR code made with Python!"

# Instantiate the QRCode class with custom parameters
qr = qrcode.QRCode(
    version=1,
    error_correction=qrcode.constants.ERROR_CORRECT_H, # High error correction
    box_size=15,
    border=5,
)

# Add the data to the QR code instance
qr.add_data(custom_data)
qr.make(fit=True)

# Create the image with custom colors
# fill_color is the color of the QR code blocks
# back_color is the background color
img_custom = qr.make_image(fill_color="darkblue", back_color="white")

# Save the custom image
img_custom.save("custom_python_qr.png")

print("Customized QR code generated successfully and saved as 'custom_python_qr.png'")

In this example:
• We create a QRCode object with specific settings for version, error_correction, box_size, and border.
• We use qr.add_data() to add our content.
• qr.make(fit=True) finalizes the QR code structure.
• qr.make_image() generates the actual image object, where we can specify the colors.
• Finally, we save the resulting image.

---

Conclusion

You now have the tools to generate QR codes effortlessly using Python. You've learned how to create a quick, standard QR code with qrcode.make() and how to build a fully customized one using the QRCode class to control everything from size and durability to color.

#### What's Next?

• Integrate into Applications: Add QR code generation to a web application (e.g., a Flask or Django app) to create user-specific codes.
• Generate Different Content: Encode Wi-Fi network details, contact information (vCards), or calendar events.
• Dynamic Generation: Build a noscript that takes user input to generate QR codes on the fly.

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By: @DataScience4 ✨