Kingsoft Office for Android allows you to edit font size of your word document on Android phone / tablet. You can also apply various font styles, just like on PC.
Follow these steps to set font size in word document on Android devices.
Step 1 Launch Kingsoft Office and open a word document (*.doc or *.docx).
Step 2 Go to the toolbar and find Font Option. Tap on it and more options for Font settings will appear on the toolbar.
Step 3 Double click on the text content to select the part you want to adjust font size and style. Tap on More from the Font group in the toolbar, you will enter the following interface.
Figure 1 & 2 Change Font Size
Step 4 Tap on Font Size area to select the font size you'd like to apply to selected text. you will see the result in the Preview area.
Finally, press OK in the upper right.