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To place text in the bottom-right corner of a single Matplotlib plot, call ax.text() with transform=ax.transAxes, then set ha="right" and va="bottom". The text stays in the same corner when the data or axis limits change. If you mean the whole figure rather than one plot, use fig.text() with figure-fraction coordinates instead.
The Axes-level method for a plot’s lower-right corner
Text added with ax.text() uses data coordinates by default. That means the x and y values you pass are interpreted in the units of your data, so a value of (0.95, 0.01) would land somewhere unrelated to the corner of the plot if your data ranges from 0 to 1,000. To anchor the label to the plot itself, pass transform=ax.transAxes. This switches the coordinates to normalized Axes units, where (0, 0) is the lower-left corner of the Axes and (1, 1) is the upper-right corner.
import matplotlib.pyplot as plt
fig, ax = plt.subplots(layout="constrained")
ax.plot([0, 1, 2, 3], [10, 40, 25, 80])
ax.text(
0.95, 0.01, "Your text",
transform=ax.transAxes,
ha="right",
va="bottom",
)
plt.show()The values 0.95 and 0.01 place the text slightly inside the Axes boundary, which keeps it from touching the frame. Adjust them to suit your layout. The same pattern appears in the official Text properties gallery example, and the broader coordinate and text model is described in the Text in Matplotlib guide.
What ha and va control
ha="right"(horizontal alignment) makes the right edge of the text sit at the x coordinate you supplied.va="bottom"(vertical alignment) makes the bottom edge of the text sit at the y coordinate you supplied.
Without these settings, the default alignment places the text’s left and baseline at the coordinate, so a long label would spill past the right edge of the plot.
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Whole-figure text in the bottom-right corner
Sometimes the label belongs to the entire canvas, such as a source note or a figure-wide caption, and not to one subplot. In that case use fig.text(). Its coordinates are figure fractions: (0, 0) is the lower-left corner of the figure and (1, 1) is the upper-right corner, as described in the Figure.text API documentation.
fig.text(
0.98, 0.02, "Source: example data",
ha="right",
va="bottom",
)Because this text is positioned against the figure rather than an Axes, it does not move with a subplot’s limits. If you have several subplots, check that the label does not overlap the bottom-right subplot’s tick labels.
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Choosing between the methods
| What you need | Method | Coordinate system |
|---|---|---|
| Text fixed to one plot’s lower-right corner | ax.text(..., transform=ax.transAxes) |
Normalized Axes coordinates, independent of data values (see the text guide) |
| Text fixed to the whole figure’s lower-right corner | fig.text(...) |
Figure fractions (see the Figure.text reference) |
| Text that points to a specific data value | ax.annotate(...) |
Separate coordinates for the target and the text, with an optional arrow (see the annotations guide) |
Use annotate only when the label has to point to a feature in the data. For a plain corner label, ax.text is simpler.
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A label placed just inside the Axes usually survives the default layout. Trouble starts when you move the text outside the Axes, or when tick labels and legends crowd the corner. The constrained layout guide describes an automatic option that adjusts subplot geometry to fit decorations such as tick labels, legends, and colorbars. Enable it when you create the figure, as in fig, ax = plt.subplots(layout="constrained").
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- Do not call
tight_layouton a figure that uses constrained layout. The guide notes that callingtight_layoutturns constrained layout off. - If you adjust subplot margins manually instead, the guide points to
Figure.subplots_adjust. Use either the layout engine or manual margins, not both. - Check the saved file, not only the on-screen window. Text drawn outside the Axes can behave differently depending on the artist and export settings, so confirm the corner label appears in the exported image.
Troubleshooting a label that is in the wrong place
- The text is at the wrong spot entirely: you probably left out
transform=ax.transAxes, so the coordinates are being read as data values. - The text runs past the right edge: check that
ha="right"is set. Without it, the text extends rightward from the coordinate. - The text is clipped or overlaps tick labels: enable constrained layout at figure creation, or increase the bottom and right margins.
- The label should cover the whole figure but sits inside one subplot: switch from
ax.texttofig.text.
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