Changing the font size in your computer's operating system or browser.1.Open Screen Resolution by clicking the Start button, clicking Control Panel, and then, under Appearance and Personalization, clicking Adjust screen resolution.2.Choose one of the following:▪Smaller - 100% (default). This keeps text and other items at normal size.▪Medium - 125%. This sets text and other items to 125% of normal size.▪Larger - 150%. This sets text and other items to 150% of normal size. This option appears only if your monitor supports a resolution of at least 1200 x 900 pixels. 3.Click Apply . To see the change, close all of your programs and then log off of Windows. This change will take effect the next time you log on. It is not easy to change system fonts in Mac OS.You can download third party software like TinkerTool to make system wide changes, including font size.Changing font size in a browser varies depending on which one you're using. Consult our browser guide on our Website Accessibility page.