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How to Set Tick Labels Font Size in Matplotlib?

How to change the size of axis labels in Matplotlib?

Last Updated : 15 Apr, 2025

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Matplotlib is a Python library that helps in visualizing and customizing various plots. One of the customization you can do is to change the size of the axis labels to make reading easier. In this guide, we’ll look how to adjust font size of axis labels using Matplotlib.

Let’s start with a basic plot to see how it works

Python

import matplotlib.pyplot as plt  x = [1, 2, 3, 4, 5] y = [9, 8, 7, 6, 5]  fig, ax = plt.subplots() ax.plot(x, y)  ax.set_xlabel('x-axis') ax.set_ylabel('y-axis')  plt.show()

Output

download6 — Sample Plot

1. Using `xlabel()` and `ylabel()`

We can change the size of axis labels by using the fontsize parameter in the xlabel() and ylabel() functions. These method allow you to specify the font size directly when setting the labels.

Python

import matplotlib.pyplot as plt  x = [1, 2, 3, 4, 5] y = [9, 8, 7, 6, 5]  fig, ax = plt.subplots() ax.plot(x, y) ax.plot(x, y)  ax.set_xlabel('x-axis', fontsize = 25) ax.set_ylabel('y-axis', fontsize = 20)  plt.show()

Output:

Screenshot-2024-12-12-121427 — Resulting plot after adjusting axis label size in Matplotlib

Here we defined x-axis font as 25 and y-axis font to be 20.

2. Using `set_xlabel()` and `set_ylabel()`

After plotting you can use set_xlabel() and set_ylabel() methods of the Axes object. These methods are used to modify labels after your plot has already been created.

Python

import matplotlib.pyplot as plt  x = [1, 2, 3, 4, 5] y = [10, 20, 25, 30, 40]  plt.plot(x, y)  plt.gca().set_xlabel('Custom X-Axis Label', fontsize=20) plt.gca().set_ylabel('Custom Y-Axis Label', fontsize=20)  plt.show()

Output:

Screenshot-2024-12-12-123717 — Resulting output after adjusting axis label size in Matplotlib

3. Changing Font Size Globally with `rcParams`

If you require consistent font sizes across multiple plots adjusting the default settings with rcParams is a better approach. This method sets a global font size for all axis labels in your environment.

Python

import matplotlib as mpl import matplotlib.pyplot as plt  mpl.rcParams['axes.labelsize'] = 20  x = [5, 10, 4, 2, 8] y = [49, 50, 90, 43, 87]  plt.plot(x, y)  plt.xlabel('Custom X-Axis Label') plt.ylabel('Custom Y-Axis Label')  plt.show()

Output:

Screenshot-2024-12-12-124140 — Resulting output after adjusting axis label size in Matplotlib

Adjusting size of axis labels improves readability and understanding. Whether it's about sharing your plots with someone or just understanding the data alone proper label size makes your visuals better. Using the given ways you will can get neat, professional and clear charts.

How to Set Tick Labels Font Size in Matplotlib?

ayushmankumar7

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Article Tags :

Python
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Python-matplotlib

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