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How to Change the Tkinter Label Font Size?

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Tkinter Label is used to display one or more lines, it can also be used to display bitmap or images. In this article, we are going to change the font-size of the Label Widget. To create Label use following:

Syntax: label = Label(parent, option, …)

Parameters:
parent: Object of the widget that will display this label, generally a root object
text: To display one or more lines of text.
image: To display a static image
compound: To display both Text and Image. It accepts TOP, BOTTOM, LEFT, RIGHT, CENTER. For example, if you write compound=TOPimage will displayed to the top of Text.

We can do this using different methods:

Method 1: By using Label’s font property.

Python3




# importing tkinter module and Widgets
from tkinter import Tk
from tkinter.ttk import Label
  
  
# Creating App class which will contain
# Label Widgets
class App:
    def __init__(self, master) -> None:
  
        # Instantiating master i.e toplevel Widget
        self.master = master
  
        # Creating first Label i.e with default font-size
        Label(self.master, text="I have default font-size").pack(pady=20)
  
        # Creating second label
        # This label has a font-family of Arial
        # and font-size of 25
        Label(self.master,
              text="I have a font-size of 25",
  
              # Changing font-size here
              font=("Arial", 25)
              ).pack()
  
  
if __name__ == "__main__":
  
    # Instantiating top level
    root = Tk()
  
    # Setting the title of the window
    root.title("Change font-size of Label")
  
    # Setting the geometry i.e Dimensions
    root.geometry("400x250")
  
    # Calling our App
    app = App(root)
  
    # Mainloop which will cause this toplevel
    # to run infinitely
    root.mainloop()


Output: 

Method 2: By using Style class. In this method, we will use our custom style otherwise all the Label widgets will get the same style.

Python3




# importing tkinter module and Widgets
from tkinter import Tk
from tkinter.ttk import Label, Style
  
  
# Creating App class which will contain
# Label Widgets
class App:
    def __init__(self, master) -> None:
  
        # Instantiating master i.e toplevel Widget
        self.master = master
  
        # Creating first Label i.e with default font-size
        Label(self.master, text="I have default font-size").pack(pady=20)
  
        # Instantiating Style class
        self.style = Style(self.master)
  
        # Configuring Custom Style
        # Name of the Style is "My.TLabel"
        self.style.configure("My.TLabel", font=('Arial', 25))
  
        # Creating second label
        # This label has a font-family of Arial
        # and font-size of 25
        Label(
            self.master,
            text="I have a font-size of 25",
  
            # Changing font-size using custom style
            style="My.TLabel").pack()
  
  
if __name__ == "__main__":
  
    # Instantiating top level
    root = Tk()
  
    # Setting the title of the window
    root.title("Change font-size of Label")
  
    # Setting the geometry i.e Dimensions
    root.geometry("400x250")
  
    # Calling our App
    app = App(root)
  
    # Mainloop which will cause this toplevel
    # to run infinitely
    root.mainloop()


Output:

Note: In the above method, TLabel is the name of the default style. So if you want to create your own style name then always use below syntax

my_style_name.default_style_name

Example:
New.TButton  # To override Button Widget’s styles
My.TLabel    # To override Label Widget’s Styles
Abc.TEntry   # To override Entry Widget’s Styles

If you use only the default style name then it will apply to all the corresponding widgets i.e if I use TLabel instead of My.TLabel then both the label will have font-size of 25. And importantly, if you use the default style name then you don’t need to provide style property.

Extra: Changing font size using the Default Style Name.

Python3




# importing tkinter module and Widgets
from tkinter import Tk
from tkinter.ttk import Label, Style
  
  
# Creating App class which will contain
# Label Widgets
class App:
    def __init__(self, master) -> None:
  
        # Instantiating master i.e toplevel Widget
        self.master = master
  
        # Creating first Label i.e with default font-size
        Label(self.master, text="I have default font-size").pack(pady=20)
  
        # Instantiating Style class
        self.style = Style(self.master)
  
        # Changing font-size of all the Label Widget
        self.style.configure("TLabel", font=('Arial', 25))
  
        # Creating second label
        # This label has a font-family of Arial
        # and font-size of 25
        Label(self.master, text="I have a font-size of 25").pack()
  
  
if __name__ == "__main__":
  
    # Instantiating top level
    root = Tk()
  
    # Setting the title of the window
    root.title("Change font-size of Label")
  
    # Setting the geometry i.e Dimensions
    root.geometry("400x250")
  
    # Calling our App
    app = App(root)
  
    # Mainloop which will cause this toplevel
    # to run infinitely
    root.mainloop()


Notice in the above program that we have not provided style or font property to any of the Label still both of them got the same font-size and same font-family.

Output:

Method 3: By using the Font class. In this method, we will create a Font object and then use this to change Font style of any widget. Benefit of this

Font class consist of following property:
root: Object of toplevel widget.
family: The font family name as a string.
size: The font height as an integer in points.
weight: ‘bold’/BOLD for boldface, ‘normal’/NORMAL for regular weight.
slant: ‘italic’/ITALIC for italic, ‘roman’/ROMAN for unslanted.
underline: 1/True/TRUE for underlined text, 0/False/FALSE for normal.
overstrike: 1/True/TRUE for overstruck text, 0/False/FALSE for normal.

Python3




# importing tkinter module and Widgets
from tkinter import Tk
from tkinter.font import BOLD, Font
from tkinter.ttk import Label
  
  
# Creating App class which will contain Label Widgets
class App:
    def __init__(self, master) -> None:
  
        # Instantiating master i.e toplevel Widget
        self.master = master
  
        # Creating first Label i.e with default font-size
        Label(self.master, text="I have default font-size").pack(pady=20)
  
        # Creating Font, with a "size of 25" and weight of BOLD
        self.bold25 = Font(self.master, size=25, weight=BOLD)
  
        # Creating second label
        # This label has a default font-family
        # and font-size of 25
        Label(self.master, text="I have a font-size of 25",
              font=self.bold25).pack()
  
  
if __name__ == "__main__":
  
    # Instantiating top level
    root = Tk()
  
    # Setting the title of the window
    root.title("Change font-size of Label")
  
    # Setting the geometry i.e Dimensions
    root.geometry("400x250")
  
    # Calling our App
    app = App(root)
  
    # Mainloop which will cause this toplevel
    # to run infinitely
    root.mainloop()


Output:



Last Updated : 23 Dec, 2020
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