Python QR Code Generator Using Pyqrcode In Tkinter

In this Python tutorial, we will learn about Python QR code generator, how to create QR code using Python Tkinter. Also, we will create an application to represent the same.

Python QR Code Generator with Logo
Python QR Code Reader
Python QR Code Save Image

Table of Contents

Overview of the QR code

QR code refers to Quick Response Code which was invented by a Japanese automotive company in 1994.
QR code is a type of Matrix barcode that is a machine-readable optical label that contains information about the item to which it is attached.
A QR code (Quick Response Code) consists of black squares arranged in a square grid on a white background, which can be read by an imaging device such as a camera.

QR code Library in Python (pyqrcode)

Python provides library pyqrcode which allows implementing QR code in Python Tkinter.

pyqrcode can be installed using pip or pip3 in the system. Use the following code:

pip install pyqrcode

or

pip3 install pyqrcode

Once you have successfully installed the pyqrcode library use the below code to test it.

import pyqrcode
url = pyqrcode.create('https://pythonguides.com/')
print(url.terminal(quiet_zone=1))

If you see the barcode generated in the terminal then you are good to go.

Source code of QR Code Generator

In the below source code, code at line number 12, 13 is responsible for generating the QR code.

from tkinter import *
from tkinter import messagebox
import pyqrcode

ws = Tk()
ws.title("PythonGuides")
ws.config(bg='#F25252')

def generate_QR():
    if len(user_input.get())!=0 :
        global qr,img
        qr = pyqrcode.create(user_input.get())
        img = BitmapImage(data = qr.xbm(scale=8))
    else:
        messagebox.showwarning('warning', 'All Fields are Required!')
    try:
        display_code()
    except:
        pass

def display_code():
    img_lbl.config(image = img)
    output.config(text="QR code of " + user_input.get())


lbl = Label(
    ws,
    text="Enter message or URL",
    bg='#F25252'
    )
lbl.pack()

user_input = StringVar()
entry = Entry(
    ws,
    textvariable = user_input
    )
entry.pack(padx=10)


button = Button(
    ws,
    text = "generate_QR",
    width=15,
    command = generate_QR
    )
button.pack(pady=10)

img_lbl = Label(
    ws,
    bg='#F25252')
img_lbl.pack()
output = Label(
    ws,
    text="",
    bg='#F25252'
    )
output.pack()
 
ws.mainloop()

The above is the python program for QR code generator.

Output of QR code Generator:

In this output, we have provided a URL and a QR code is generated for that URL. This can be scanned using an imaging device like a camera.

Read: How to Create a Snake Game in Python Tkinter

Python Tkinter QRcode save image

In this section, we will learn how to save the Generated QR code image file in our computer for later use.

In the above section, we have learned how to generate QR codes using Python Tkinter. In this section, we will cover how to save that generated QR code in Python Tkinter.
The library we are using here is qrcode. Use the following code to install qrcode on your machine.

pip install qrcode[pil]

using qrcode.make method in qrcode library we can generate QR code.
And, using qrcode.save method in qrcode library we can save the generated QR code to the provided location.

Souce code of Python Tkinter QRcode save image

In this code, we have created an interface in which user can type the message or url. In the next entry field, user need to provide the file name. Once clicked on the generate button, an image of QR code will be saved in the same directory.

import qrcode
from tkinter import *
from tkinter import messagebox

ws = Tk()
ws.title('PythonGuides')
ws.geometry('400x200')
ws.config(bg='#4a7a8c')


def generate():
    img = qrcode.make(msg.get())
    type(img) 
    img.save(f'{save_name.get()}.png')
    Label(ws, text='File Saved!', fg='green').pack()

frame = Frame(ws, bg='#4a7a8c')
frame.pack(expand=True)

Label(
    frame,
    text='URL',
    font = ('Times', 18),
    bg='#4a7a8c'
    ).grid(row=0, column=0, sticky='w')

msg = Entry(frame)
msg.grid(row=0, column=1)

Label(
    frame,
    text='Save as',
    font = ('Times', 18),
    bg='#4a7a8c',
).grid(row=1, column=0, sticky='w')

save_name = Entry(frame)
save_name.grid(row=1, column=1)

btn = Button(
    ws, 
    text='Generate QR code',
    command=generate
    )
btn.pack()

ws.mainloop()

Output

In this output, QR image is saved in the same directory where the main file is.

python tkinter qr code save image — Python Tkinter QR code save image

Read Python Tkinter Image

Python QR code Generator with Logo

In this section, we will learn how to generate QR code with Logo in the center of it.

To generate a QR code with a Logo in Python Tkinter, we have to perform two tasks and then merge them into one.
first, we have to prepare the logo using Pillow library and then we have to add that logo in the code for generating QR code.
We are using qrcode and Pillow modules to perform the task. These modules can be installed using pip. The below command will install both in one go.

pip install qrcode[pil]

Source code

Here is the source code to create QR code with logo in Python Tkinter.

import qrcode
import PIL.Image
from tkinter import *

ws = Tk()
ws.title('PythonGuides')
ws.geometry('400x300')
ws.config(bg='#f25252')

logo = PIL.Image.open('logo.png')

def generate_qr():
    global logo
    basic = 100
    width_percentage = (basic/float(logo.size[0]))
    height_size = int((float(logo.size[1])*float(width_percentage)))
    logo = logo.resize((basic, height_size), PIL.Image.ANTIALIAS)
    qrc = qrcode.QRCode(error_correction=qrcode.constants.ERROR_CORRECT_H)

    qrc.add_data(msg.get())
    qrc.make()
    gen_img = qrc.make_image(
        fill_color='#4a7a8c', 
        bg_color="#fff"
        ).convert('RGBA')

    position = ((gen_img.size[0] - logo.size[0]) // 2, (gen_img.size[1] - logo.size[1]) // 2)

    gen_img.paste(logo, position)
    gen_img.save(save_name.get()+'.png')

    lbl.config(text='File saved with logo')

frame = Frame(ws, bg='#f25252')
frame.pack(expand=True)

Label(frame, text='Enter URL ', bg='#f25252').grid(row=0, column=0)
msg = Entry(frame)
msg.grid(row=0, column=1)

Label(frame, text='File Name', bg='#f25252').grid(row=1, column=0)
save_name = Entry(frame)
save_name.grid(row=1, column=1)

btn = Button(
    frame,
    text='Generate',
    command=generate_qr
)
btn.grid(row=2, columnspan=3, pady=10)

lbl = Label(ws, fg='green', bg='#f25252')
lbl.pack()

ws.mainloop()

Output

In this output, application accepts URL and the file name, when clicked on button it generated a QR code with logo.

Python Tkinter QR code with logo

Read How to convert Python file to exe using Pyinstaller

Python QR Code Reader

In this section, we will learn how to create QR code Reader in Python Tkinter.

Using the OpenCV library in python we will use our laptop’s camera to scan the QR code and the result will be printed on the Python Tkinter window.
Other than OpenCV we also require pyzbar to handle the QR code recognition. Both the libraries can be installed using pip.

# pip install pyzbar
# pip install opencv_contrib_python

If you are a Ubuntu user than you also need to install this package on the system

sudo apt-get install zbar-tools

Source Code

vid = cv2.VideoCapture(0) this code is to start the camera on the laptop.
while i<2: the information of the QR code will be captured 2 times in a row
decoded = pyzbar.decode(f)this code is to recognize and record the QRcode.
the decoded variable will hold multiple information in a list format. Information like data, type, a rectangle property of image, width, height, etc.
to fetch the data for loop is run and data will be displayed on the label.

from tkinter import *
import cv2
import pyzbar.pyzbar as pyzbar

def scanQR():
   i = 0
   vid = cv2.VideoCapture(0)
   while i<2:
       _,f = vid.read()
       decoded = pyzbar.decode(f)
       for obj in decoded:
           lbl.config(text=f'{obj.data}')
           i += 1
       cv2.imshow('QRCode',f)
       cv2.waitKey(5)
       cv2.destroyAllWindows

ws = Tk()
ws.title('PythonGuides')
ws.geometry('300x200')

Button(
    ws,
    text='Scan QRCode',
    command=scanQR
).pack(pady=10)

lbl = Label(ws, font=('times', 20))
lbl.pack()

ws.mainloop()

Output

In this output, the Python Tkinter window has a Scan QRCode button. When this button is clicked a camera screen is opened. When showed QR code on the camera then information of QR code is displayed on the Tkinter window.

python tkinter QR code reader — Python Tkinter QR Code Reader

You may like the following Python Tkinter articles:

In this tutorial, we have learned about Python QR codes. Also, we have created a Python QR code generator using pyqrcode in Tkinter.

Python QR Code generator with logo
Python QR Code Reader
Python QR Code Save Image

Bijay Kumar

Python is one of the most popular languages in the United States of America. I have been working with Python for a long time and I have expertise in working with various libraries on Tkinter, Pandas, NumPy, Turtle, Django, Matplotlib, Tensorflow, Scipy, Scikit-Learn, etc… I have experience in working with various clients in countries like United States, Canada, United Kingdom, Australia, New Zealand, etc. Check out my profile.

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