For a single plot’s Axes title, pass a numeric fontsize to ax.set_title(): ax.set_title("My title", fontsize=18). Use plt.title() for the current Axes, or change axes.titlesize when you want a default for multiple Axes titles.
Change the size of one Axes title
Use fontsize as a keyword argument when setting the title:
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.plot(x, y)
ax.set_title("My title", fontsize=18)
The value is a font size in points; replace 18 with a suitable numeric size for your chart. Matplotlib’s Axes.set_title API accepts text properties as keyword arguments and returns the title’s Text instance.
If you are using pyplot’s current-Axes interface, the equivalent call is:
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plt.title("My title", fontsize=18)Set the default size for Axes titles
To apply a default to Axes titles more broadly, set the axes.titlesize rcParam before creating or updating the titles:
import matplotlib.pyplot as plt
plt.rcParams["axes.titlesize"] = 18
axes.titlesize controls Axes-title text specifically; it is separate from general text size and axis-label size. For a reusable project style, add axes.titlesize : 18 to a Matplotlib style sheet and apply it with matplotlib.style.use, or configure it in a matplotlibrc file. In Matplotlib’s documented configuration precedence, runtime rcParams override style sheets, and style sheets override matplotlibrc settings. See the customization documentation.
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Change a figure-level title instead
A figure-level title created with fig.suptitle() is distinct from an individual Axes title. Set its size with the call’s fontsize argument:
fig.suptitle("My figure", fontsize=20)For a default figure-title size, use figure.titlesize, not axes.titlesize. The figure API documentation describes figure-level title settings.
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Adjust title placement separately
Font size and title position are independent. By default, Matplotlib determines an Axes title’s vertical position to avoid top-side Axes decorations. If a larger title crowds nearby content, make more room in the figure layout or adjust placement with y or axes.titley; pad changes the offset in points.
ax.set_title("My title", fontsize=18, pad=12)The loc argument controls horizontal alignment—"left", "center", or "right"—without changing the font size. Matplotlib’s title-positioning example illustrates alignment and automatic placement.
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These API examples follow the stable Matplotlib documentation, labeled version 3.11.2 in the cited pages. Consult the stable documentation for the release you use if API behavior or defaults differ.
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