Thai typography concerns the representation of the Thai script in print and on displays, and dates to the earliest printed Thai text in 1819. The printing press was introduced by Western missionaries during the mid-nineteenth century, and the printed word became an increasingly popular medium, spreading modern knowledge and aiding reform as the country modernized. The printing of textbooks for a new education system and newspapers and magazines for a burgeoning press in the early twentieth century spurred innovation in typography and type design, and various styles of Thai typefaces were developed through the ages as metal type gave way to newer technologies. Modern media is now served by digital typography, and despite early obstacles including lack of copyright protection, the market now sees contributions by several type designers and digital type foundries.
The printed Thai script has characters in the line of text, as well as combining characters that appear above or below them. One of the main distinguishing features among typefaces is the head of characters, also referred to as the terminal loop. While these loops are a major element of conventional handwritten Thai and traditional typefaces, the loopless style, which resembles sans-serif Latin characters and is also referred to as Roman-like, was introduced in the 1970s and has become highly popular. It is widely used in advertising and as display typefaces, though its use as body-text font has been controversial. Classification systems of Thai typefaces—primarily based on the terminal loop—have been proposed, as has terminology for type anatomy, though they remain under development as the field continues to progress.