Python QR Code Generator with Custom Colors and Logo

QR codes, also known as two‑dimensional barcodes, are widely used; this tutorial explains how to quickly generate a QR code with Python, allowing customization of background, fill color, and an optional central logo.

First, install the required third‑party libraries:

pip install qrcode
pip install pillow  # Pillow replaces the older PIL library for Python 3+

The qrcode.QRCode class accepts several parameters: version (size of the matrix, 1‑40), error_correction (L, M, Q, H levels), box_size (pixel size of each box), and border (width of the white border).

A Tkinter window is created to let the user enter the text or URL, choose fill and background colors, and press a button to generate the QR code. The GUI code is shown below:

if __name__ == '__main__':
    window = tk.Tk()
    window.title('二维码生成器')
    window.geometry('900x600')
    label_url = tk.Label(window, text="输入文本：")
    label_url.place(x=50, y=40)
    Entry_input_url = tk.Entry()
    Entry_input_url.place(x=120, y=40)
    label_fill_color = tk.Label(window, text="填充颜色：")
    label_fill_color.place(x=50, y=80)
    Entry_input_fill_color = tk.Entry()
    Entry_input_fill_color.place(x=120, y=80)
    label_back_color = tk.Label(window, text="背景颜色：")
    label_back_color.place(x=50, y=120)
    Entry_input_back_color = tk.Entry()
    Entry_input_back_color.place(x=120, y=120)
    button = tk.Button(window, text='开始生成', command=create_code)
    button.place(x=140, y=160)
    window.mainloop()

The create_code function builds the QR code, converts it to RGBA, loads a logo image, resizes the logo to fit within the QR code, and pastes it at the center. The final image is saved as qr.png and displayed in the Tkinter window.

def create_code():
    content = Entry_input_url.get()
    fill_color = Entry_input_fill_color.get()
    back_color = Entry_input_back_color.get()
    qr = qrcode.QRCode(version=2,
                       error_correction=qrcode.constants.ERROR_CORRECT_H,
                       box_size=6,
                       border=2)
    qr.add_data(content)
    qr.make(fit=True)
    img = qr.make_image(fill_color=fill_color, back_color=back_color)
    img = img.convert("RGBA")
    icon = Image.open("2.jpg")
    img_w, img_h = img.size
    factor = 4
    size_w, size_h = int(img_w / factor), int(img_h / factor)
    icon_w, icon_h = icon.size
    if icon_w > size_w:
        icon_w = size_w
    if icon_h > size_h:
        icon_h = size_h
    icon = icon.resize((icon_w, icon_h), Image.ANTIALIAS)
    w, h = int((img_w - icon_w) / 2), int((img_h - icon_h) / 2)
    icon = icon.convert("RGBA")
    img.paste(icon, (w, h), icon)
    img.save("qr.png")
    photo = tk.PhotoImage(file="qr.png")
    Label_img = tk.Label(window, image=photo)
    Label_img.place(x=300, y=300)

The article concludes with a disclaimer that the content is collected from the internet and the original author retains copyright.