How to Set Window Size in Tkinter

In Tkinter, controlling the size of your application’s window is crucial for creating well-designed and user-friendly interfaces. See methods to set and manage the window size in Tkinter.

1. Using geometry()

The most common way to set the window size is by using the geometry() method. This method allows you to specify the width and height of the window in pixels, as well as its initial position on the screen.

Example: Setting a Fixed Size

import tkinter as tk

root = tk.Tk()
root.title("Fixed Size Window")

root.geometry("600x400")  # Width x Height

root.mainloop()

This code creates a window with a width of 600 pixels and a height of 400 pixels.

Example: Setting Size and Position

import tkinter as tk

root = tk.Tk()
root.title("Positioned Window")

root.geometry("600x400+100+50")  # Width x Height + X + Y

root.mainloop()

This code sets the window size to 600×400 and positions the top-left corner 100 pixels from the left edge of the screen and 50 pixels from the top.

2. Using resizable()

The resizable() method allows you to control whether the user can resize the window. You can disable resizing in either the horizontal or vertical direction, or both.

Example: Disabling Resizing

import tkinter as tk

root = tk.Tk()
root.title("Non-Resizable Window")

root.geometry("400x300")
root.resizable(False, False)  # Disable both width and height resizing

root.mainloop()

In this example, the window cannot be resized by the user.

Example: Resizing Only in One Direction

import tkinter as tk

root = tk.Tk()
root.title("Resizable Height Only")

root.geometry("400x300")
root.resizable(False, True)  # Disable width resizing, enable height resizing

root.mainloop()

Here, the user can only resize the window vertically.

3. Getting Screen Dimensions

You can retrieve the screen width and height to dynamically set the window size or position.

import tkinter as tk

root = tk.Tk()
root.title("Full Screen Window")

screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()

root.geometry(f"{screen_width}x{screen_height}+0+0")  # Set to full screen

root.mainloop()

This code sets the window to full-screen size.

4. Setting Minimum and Maximum Sizes

You can set minimum and maximum window sizes to prevent the window from becoming too small or too large.

import tkinter as tk

root = tk.Tk()
root.title("Min/Max Size Window")

root.geometry("600x400")
root.minsize(300, 200)  # Minimum width and height
root.maxsize(800, 600)  # Maximum width and height

root.mainloop()

This code sets the initial size to 600×400, the minimum size to 300×200, and the maximum size to 800×600.