By default WordPress doesn’t provides you any options for changing default font size of HTML text editor. Sometimes it becomes very hard to read and edit content from HTML text editor as there is no options to change normal text font size there. This tutorial explains you an easiest way of changing font size of your WordPress HTML editor.
We will be using Admin Font Editor plugin. First thing you should know about this plugin is that it doesn’t adds any font size selector in WordPress Visual or HTML Editor instead it allows you to set new default font size and style for HTML editor. The plugin has no effect on WordPress visual editor.
Install and activate Admin Font Editor. After activation visit your admin area Dashboard -> Settings -> Admin Font Editor and select new font size number and style then Save Changes button. That’s all, it automatically takes effect on WordPress HTML text editor.