Create Custom Signature Images with Python Tkinter – A Step‑by‑Step Guide

Tkinter is Python's standard GUI library, allowing rapid creation of graphical applications. This tutorial demonstrates building a custom signature generator using Tkinter.

Tkinter Overview

Because Tkinter is bundled with Python, you can import it directly. from tkinter import * Tkinter provides components such as labels, entries, buttons, frames, and comboboxes. The following image shows the available widgets.

Obtaining Personalized Signature Images

The first step is to locate a suitable online signature‑generation site and inspect its request. An example site is http://www.yishuzi.com/b/13.htm . Using the browser's developer tools, you can set colors and input a name to generate a signature.

Send a POST request with the parameters id (the name) and id1 (the font style) using requests.post().

import requests
from urllib.request import urlretrieve
url = 'http://www.yishuzi.com/b/re13.php'
d = requests.post(url, data={
    'id': '测试签名',
    'zhenbi': '20191123',
    'id1': '904',
    'id2': '#FFFFFF',
    'id4': '#000000',
    'id6': '#000000'
})
print(d.content.decode("utf-8"))

The response contains a URL to the generated image, which can be downloaded with urlretrieve().

def create_sign(word):
    url = 'http://www.yishuzi.com/b/re13.php'
    d = requests.post(url, data={
        'id': word,
        'zhenbi': '20191123',
        'id1': '904',
        'id2': '#FFFFFF',
        'id4': '#000000',
        'id6': '#000000'
    })
    myurl = d.content.decode("utf-8").split('"')[1]
    urlretrieve(myurl, word + '.png')

Designing the GUI

With create_sign() ready, build a Tkinter window that includes Label, Entry, Button, Frame, and Combobox widgets.

import tkinter as tk
from tkinter import ttk, PhotoImage, Label, Entry, Button, Frame

root = tk.Tk()
root.title("Signature Design by: Fast Learn Python")
root.geometry("600x400")

bg_image = PhotoImage(file='background.png')
bg_label = Label(root, image=bg_image)
bg_label.place(relwidth=1, relheight=1)

frame = Frame(root, bg='#edcc79', bd=5)
frame.place(relx=0.5, rely=0.1, relwidth=0.75, relheight=0.1, anchor='n')

font_label = Label(frame, text='输入签名:', font=('微软雅黑', 16), fg='black')
font_label.place(relwidth=0.25, relheight=1)

name_entry = Entry(frame, font=('微软雅黑', 16))
name_entry.place(relx=0.25, relwidth=0.5, relheight=1)

btn = Button(frame, text='生成', command=lambda: create_sign(name_entry.get()))
btn.place(relx=0.75, relwidth=0.25, relheight=1)

# Combobox example
cv = tk.StringVar()
com = ttk.Combobox(root, textvariable=cv)
com['value'] = ('Option1', 'Option2', 'Option3', 'Option4')
com.current(0)
com.pack()

root.mainloop()

Running the program opens a window where you can type a name, click the button, and automatically obtain a personalized signature image.

This completes the Tkinter practical example.