To increase or decrease the size of a web page in Firefox, press Ctrl and '+' (plus) to zoom in or Ctrl and - (minus) to zoom out. To change back to the original size, press Ctrl + 0. 

 

You can change the size of your web pages at any time by using the following keys: Press Ctrl and '+' (plus) to zoom in and press Ctrl and - (minus) to zoom out. Press Ctrl + 0 to return to the default size. 

In Internet Explorer 7 and later, you can resize the website at any time by using the following keys: use Press Ctrl and '+' (plus) to zoom in, press Ctrl and - (minus) to zoom out. 

To increase or decrease the size of a web page in Opera, to press the '+' (plus) to zoom in by 10%, or '-' (minus) to zoom out by 10%. To change back to the original size, press Ctrl + 0 or press * (star). 

 

To increase or decrease the size of a web page in Safari, press Ctrl and '+' (plus) to zoom in or Ctrl and - (minus) to zoom out. To change back to the original size, press Ctrl + 0. 

Mac 

To increase or decrease the size of text on a web page in Firefox, press Apple and '+' (plus) to make the text bigger or Apple and - (minus) to make the text smaller. To change back to the original size, press Apple + 0. 

 

Opera 

To increase or decrease the size of a web page in Opera, to press the '+' (plus) to zoom in by 10%, or '-' (minus) to zoom out by 10%. (In older versions of Opera you can also press 9 to zoom in, and 0 to zoom out). To change back to the original size, press Apple + 0 or press * (star).