Windows Keyboard Shortcuts


Ctrl+= and Ctrl+Dash: Increase and decrease font size in Firefox and Thunderbird

Posted in Firefox by estephen on April 2nd, 2007

Following last week’s general browser tips, here’s one that works for Firefox and Thunderbird.

  • Ctrl+=: Increase font size
  • Ctrl+Dash: Decrease font size

Press Ctrl+= (that is, the Ctrl key held down, and then the = key) and the font size on the current page or e-mail will increase.

(A lot of people write this tip as Ctrl+Plus, because the mnemonic of the + key increasing the font size is easy to remember, but you don’t need the Shift key in there.)

Ctrl+Dash (that is, the - key, or minus — the key right next to the = key) will reduce the font size.

Each time you press the key, the font gets bigger or smaller. When you want to go back to normal, press Ctrl+0. (Thanks to Steve in the comments for that last one.)
(This is a little hard to write, given the terminology I’m using. I should refer to “Control with the Plus key” as Ctrl++ and “Control with the Dash key” as Ctrl+- but that looks really weird. Sorry if today’s tip is confusing!)

6 Responses to 'Ctrl+= and Ctrl+Dash: Increase and decrease font size in Firefox and Thunderbird'

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  1. Steve said,

    on May 18th, 2007 at 12:53 pm

    Plus, if you need a quick way of getting back to standard, CTRL+0 (right next to these other shortcuts) will return to defauly size.


  2. on June 5th, 2008 at 7:17 am

    Also, holding control and rolling your mousewheel up and down has the same effect!

  3. estephen said,

    on June 19th, 2008 at 12:29 am

    Steve, that’s a very good point, thanks for adding that.

    Kevin, sure, but I hate using the mouse! :)

  4. leemz said,

    on August 27th, 2010 at 2:53 am

    Thanks a billion. I thought it would never get fixed.

  5. Beverely said,

    on June 14th, 2012 at 2:30 pm

    I hit ctrl shift + and it made my screen big,, I have tried to hit ctrl shift - but it won’t go back to normal screen any help would be greatly appreciated.

  6. Jan said,

    on October 5th, 2012 at 2:37 am

    Thanks Kevin. My laptop does not have a plus sign, but now i fixed it!

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