How to Set Bold Font for Text Widget in Tkinter Python

Bold Font for Text Widget in Tkinter Python

In Tkinter, the Text widget is used to display and edit multiple lines of text. You can set a bold font for the text inside a Text widget by specifying a font style that includes the weight='bold' attribute.

To apply bold text in a Tkinter Text widget, you need to:

• Use the font option while creating the Text widget.
• Apply a tag to specific text using text_widget.tag_add().
• Configure the tag with a bold font using text_widget.tag_config().

In this tutorial, we will go through examples using different methods to set bold font in a Tkinter Text Widget.

Examples

1. Setting Bold Font for Entire Text in a Text Widget

In this example, we will create a Tkinter Text widget and set the entire text content to a bold font.

We are using the font=("Arial", 12, "bold") attribute to set the text inside the Text widget to bold. The Text widget is initialized with the variable text_widget, and the insert() method is used to add default text.

main.py

import tkinter as tk

# Create the main window
root = tk.Tk()
root.title("Bold Text in Tkinter - tutorialkart.com")
root.geometry("400x200")

# Create a Text widget with bold font
text_widget = tk.Text(root, font=("Arial", 12, "bold"))
text_widget.pack(pady=10)

# Insert sample text
text_widget.insert(tk.END, "This is bold text inside a Text widget.")

# Run the application
root.mainloop()

Output in Windows:

The text inside the Text widget appears in bold using the Arial font with a size of 12.

2. Setting Bold Font for Specific Text Using Tags in Text Widget

In this example, we will make only a specific part of the text inside a Text widget bold by using tags.

We are inserting two lines of text into the Text widget and then applying the bold_tag to the second line using text_widget.tag_add(). The tag is configured using text_widget.tag_config() with the font set to bold.

main.py

import tkinter as tk

# Create the main window
root = tk.Tk()
root.title("Bold Text with Tags - tutorialkart.com")
root.geometry("400x200")

# Create a Text widget
text_widget = tk.Text(root, font=("Arial", 12))
text_widget.pack(pady=10)

# Insert sample text
text_widget.insert(tk.END, "This is normal text.\n")
text_widget.insert(tk.END, "This text will be bold.")

# Define a tag for bold text
text_widget.tag_config("bold_tag", font=("Arial", 12, "bold"))

# Apply the tag to the second line
text_widget.tag_add("bold_tag", "2.0", "2.end")

# Run the application
root.mainloop()

Output in Windows:

The first line appears in normal font, while the second line is displayed in bold.

Conclusion

In this tutorial, we explored different ways to set bold font for a Text widget in Tkinter:

• Setting bold font for the entire text using font=("Arial", 12, "bold").
• Applying bold font to specific parts of text using text_widget.tag_add() and text_widget.tag_config().