To quickly change the font size of text in a Word document, select the text and press Control + ] to make the font bigger and Control + [ to make it smaller. You will alter the size value one point at a time. Alternately, use Control + Shift + > and Control + Shift + < to increase or decrease the font size to the next value shown in the Font size dropdown list which has the values 8, 9, 10, 11, 12, 14, 16, 18 etc..
