Strength of Evidence:
Document Type: Guideline
Text and Styles
Use at least a 12-point font (e.g., typeface) on all Web pages.
Research has shown that fonts smaller than 12 points elicit slower reading performance from users. For users over age 65, it may be better to use at least fourteen-point fonts. Never use less than nine-point font on a Web site.
Traditional paper-based font sizes do not translate well to Web site design. For instance, Windows Web browsers display type two to three points larger than the same font displayed on a Macintosh. User-defined browser settings may enlarge or shrink designer-defined font sizes. Defining text size using pixels will result in differently-sized characters depending upon the physical size of the monitors pixels and its set resolution, and presents accessibility issues to those individuals who must specify large font settings.
Related Usability Guidelines: