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How to increase/reduce the fontsize of x and y tick labels You can also set the ticklabel font size globally (i.e. for all figures/subplots in a script) using rcParams: import matplotlib.pyplot as plt plt.rc ('xtick',labelsize=8) plt.rc ('ytick',labelsize=8) Or, equivalently: plt.rcParams ['xtick.labelsize']=8 plt.rcParams ['ytick.labelsize']=8 How to change the font size of tick labels of a colorbar in Matplotlib? I tried changing the font size of the ticks as follow: cmapProp = {'drawedges': True, 'boundaries': np.linspace (0, 1, 13, endpoint=True).round (2), 'fontsize': 14} But this gives me the following error: TypeError: init () got an unexpected keyword argument 'fontsize' I wonder, how can I change the font size of the tick labels next to the colorbar? Matplotlib make tick labels font size smaller Matplotlib make tick labels font size smaller. To specify both font size and rotation at the same time, try ...