To change the font size in most browsers, hold down the Ctrl key on the keyboard, and press the + (plus) key to zoom in or the - (minus) key to zoom out. You can also hold the Ctrl key and use a mouse wheel to zoom in and out.Continue Reading
When using Firefox, Safari or Internet Explorer 7, 8 or 9, hold down the Ctrl key. Mac users hold down the Apple key instead.
On your keyboard, press the + key to make the text larger. This also increases the size of any images on the page. To zoom in with your mouse, use the mouse wheel to scroll up.
On your keyboard, press the - key to make the text smaller. With your mouse, scroll the wheel down to zoom out.