A Quick Response Code or a QR Code is a two-dimensional bar code used for its fast readability and comparatively large storage capacity. It consists of black squares arranged in a square grid on a white background.

Python has a library “qrcode” for generating QR code images. It can be installed using pip.

pip install qrcode

Approach:

• Import module

• Create Qrcode with qrcode.make() and it returns a PilImage object.

• Save into image

Syntax:

qrcode.make('Data to be encoded')

Example :

# Importing library
import qrcode

# Data to be encoded
data = 'QR Code using make() function'

# Encoding data using make() function
img = qrcode.make(data)

# Saving as an image file
img.save('MyQRCode1.png')

Output:

Example :

We can also use QRCode class to create a QR Code and change its details. It takes the following parameters:

• Version: This parameter is an integer from 1 to 40 that controls the size of the QR Code (the smallest, version 1, is a 21×21 matrix).

• error_correction: This parameter controls the error correction used for the QR Code. There are following four constants available for this :

  • qrcode.constants.ERROR_CORRECT_L : About 7% or fewer errors can be corrected.

  • qrcode.constants.ERROR_CORRECT_M (default) : About 15% or fewer errors can be corrected.

  • qrcode.constants.ERROR_CORRECT_Q: About 25% or fewer errors can be corrected.

  • qrcode.constants.ERROR_CORRECT_H: About 30% or fewer errors can be corrected.

• box_size: This parameter controls how many pixels each “box” of the QR code is.

• border: The border parameter controls how many boxes thick the border should be (the default is 4, which is the minimum in the specification).

• add_data(): This method is used to add data to the QRCode object. It takes the data to be encoded as a parameter.

• make(): This method with (fit=True) ensures that the entire dimension of the QR Code is utilized, even if our input data could fit into less number of boxes.

• make_image(): This method is used to convert the QRCode object into an image file. It takes the fill_color and back_color optional parameters to set the foreground and background color.

Below is the implementation:

# Importing library
import qrcode

# Data to encode
data = "GeeksforGeeks"

# Creating an instance of QRCode class
qr = qrcode.QRCode(version = 1,
                   box_size = 10,
                   border = 5)

# Adding data to the instance 'qr'
qr.add_data(data)

qr.make(fit = True)
img = qr.make_image(fill_color = 'red',
                    back_color = 'white')

img.save('MyQRCode2.png')

Output :

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