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Home/ Questions/Q 557715
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T12:03:21+00:00 2026-05-13T12:03:21+00:00

notepad++ allow me to increase the font size when I hold the Ctrl Key

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notepad++ allow me to increase the font size when I hold the Ctrl Key and rotate the mouse middle scroll button to forward.

In the same way, the when I hold Ctrl and rotate the mouse middle scroll button backward, the fond size reduces.

How can I get the same with Emacs?

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  1. Editorial Team
    Editorial Team
    2026-05-13T12:03:21+00:00Added an answer on May 13, 2026 at 12:03 pm

    code for AlexCombas’ answer:

    (defun font-big ()
     (interactive)
     (set-face-attribute 'default nil :height 
      (+ (face-attribute 'default :height) 10)))
    
    (defun font-small ()
     (interactive)
     (set-face-attribute 'default nil :height 
      (- (face-attribute 'default :height) 10)))
    
    (global-set-key (kbd "<C-wheel-down>") 'font-small)
    (global-set-key (kbd "<C-wheel-up>") 'font-big)
    

    Edit: for a min and a max use

    (defun font-big ()
     (interactive)
     (set-face-attribute 'default nil :height 
      (min 720
       (+ (face-attribute 'default :height) 10))))
    
    (defun font-small ()
     (interactive)
     (set-face-attribute 'default nil :height 
      (max 80
       (- (face-attribute 'default :height) 10))))
    
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