How to increase the size of axes labels on a seaborn ... Examples of how to increase the size of axes labels on a seaborn heatmap in python: Summary. 1 -- Create a simple heatmap using seaborn. 2 -- Increase the size of the labels on the x-axis. 3 -- Increase the size of the labels on the y-axis. 4 -- Increase the size of all the labels in the same time. 5 -- References.