THE INFLUENCE OF FONT SIZE AND WEIGHT ON COGNITIVE LOAD

Summary from the TLDR Design newsletter

Typography choices have a significant impact on cognitive load, with font size and weight affecting how users perceive and process information. Readability tends to be optimal between 17 and 161 points—extremes can disrupt flow and hinder comprehension. Font weight shapes visual hierarchy but requires balance: too bold can overwhelm, while too light can reduce legibility, especially on mobile. These factors are critical for accessibility, as 16% of users rely on clear, well-sized text that meets WCAG standards.