In general, it is not possible to increase text size without also enlarging images, but it is simple to zoom in on text. Windows users zoom in by holding "ctrl" and pressing the "+" key (zoom out by pressing "-"). Mac users should hold "command" instead of the "ctrl" key.
However, Google's Chrome browser allows users to increase text size without enlarging the rest of a page's content. Click the Chrome menu icon, located on the right side of the browser toolbar, click Settings then click Show advanced settings. In the Web Content section, the Font size drop-down menu allows users to increase or decrease text size. Some websites may not have resizable text, in which case Chrome users can use the "ctrl" and "+" shortcut described above.