How to create a borderless fullscreen application using Python-3 Tkinter?

In order to make a Tkinter window borderless and full-screen, we can use the utility method attributes('-fullscreen', True). Tkinter windows can be configured using functions and methods defined in the Tkinter library.

Another similar method Tkinter provides to make the application window full-screen is overrideredirect(True). This method can be invoked only if the application needs to resize in its defined width and height only.

Method 1: Using attributes('-fullscreen', True)

The attributes('-fullscreen', True) method creates a true fullscreen window that covers the entire screen including the taskbar ?

# Import the required Libraries
from tkinter import *

# Create an instance of Tkinter frame
win = Tk()

# Set the Geometry
win.geometry("750x250")

# Full Screen Window
win.attributes('-fullscreen', True)

def quit_win():
    win.destroy()

# Create a Quit Button
button = Button(win, text="Quit", font=('Comic Sans', 13, 'bold'), command=quit_win)
button.pack(pady=20)

win.mainloop()

Running the above code will display a full-screen window that covers the entire screen. Click the "Quit" button to close the full-screen window.

Method 2: Using overrideredirect(True)

The overrideredirect(True) method removes the window decorations (title bar, borders) but doesn't automatically make it fullscreen ?

from tkinter import *

# Create an instance of Tkinter frame
win = Tk()

# Remove window decorations
win.overrideredirect(True)

# Get screen dimensions and set window to fullscreen
screen_width = win.winfo_screenwidth()
screen_height = win.winfo_screenheight()
win.geometry(f"{screen_width}x{screen_height}+0+0")

def quit_win():
    win.destroy()

# Create a Quit Button
button = Button(win, text="Quit", font=('Arial', 12, 'bold'), command=quit_win)
button.pack(pady=20)

# Add Escape key binding to quit
win.bind("<Escape>", lambda e: quit_win())

win.mainloop()

This method gives you more control over the window appearance and allows you to add custom exit methods like the Escape key.

Comparison

Adding Exit Options

Since fullscreen windows hide the close button, always provide exit methods ?

from tkinter import *

win = Tk()
win.attributes('-fullscreen', True)

def quit_win():
    win.destroy()

# Multiple exit options
button = Button(win, text="Quit", font=('Arial', 12, 'bold'), command=quit_win)
button.pack(pady=20)

# Escape key to quit
win.bind("<Escape>", lambda e: quit_win())

# F11 to toggle fullscreen
def toggle_fullscreen(event=None):
    win.attributes('-fullscreen', not win.attributes('-fullscreen'))

win.bind("<F11>", toggle_fullscreen)

win.mainloop()

Conclusion

Use attributes('-fullscreen', True) for simple fullscreen applications. Use overrideredirect(True) when you need more control over window behavior and custom borderless designs.