The font scale property allows you to zoom a font in or out, effectively making the text larger or smaller. Unlike using the font size property, font scale will not re-create the font (when using standard fonts). Font scale is also necessary for resizing custom fonts.
By default Text objects Font Scale value of 1.
Font scale can be increased, but doing so can make fonts pixellated. For example, setting the Font Scale value to 5 makes each pixel on the font 5x as large, resulting in a pixellated text object.
Similarly, FontScale can be set to a value smaller than 1, resulting in a shrunk font.