In any text editor, when I type
⌥ p it inserts π at cursor
⌥ w it inserts at cursor
Thus every key when pressed with option inserts some special character.


How can I disable this ?

Why I want to disable this?

  1. I hardly use these symbols
  2. I am an hardcore emacs user, hence I always prefer shortcuts like
    • ^ A to move cursor to beginning, instead of Home
    • ^ n to next line, instead of
    • ^ K to kill line
      Thus I always use Control + Key for every navigation in text.
      But since mac has some other functionaly for Option + Key I cannot use some thing like, ⌥ w to copy region

Note: - The reason I love Mac over Linux apart from Crispy UI, is its native support to emacs shortcuts. If shortcut with option modifier work well every text editor will be emacs for me.

4 Answers 4


Save the following to ~/Library/KeyBindings/DefaultKeyBinding.dict (create if necessary).

{ "~a" = (); "~b" = (); "~c" = (); "~d" = (); "~e" = (); "~f" = (); "~g" = (); "~h" = (); "~i" = (); "~j" = (); "~k" = (); "~l" = (); "~m" = (); "~n" = (); "~o" = (); "~p" = (); "~q" = (); "~r" = (); "~s" = (); "~t" = (); "~u" = (); "~v" = (); "~w" = (); "~x" = (); "~y" = (); "~z" = (); }

This disables all the ⌥<letter> combinations. Restart apps to take effect.

The DefaultKeyBinding.dict above is an old-style property list1, defining key-value pairs using the syntax { key = value }. In this case, the keys are the key combinations to activate the method in the value.

Standard dictionary key symbols are used: ~ alt, ^ control, $ shift, @ command.
Therefore ~a means ⌥A (alt-A) and ^$1 would be ⌃⇧1 (control-shift-1).

The value for each of the keys is set to ()—empty parentheses without a method. As DefaultKeyBinding.dict overrides /S*/L*/Fr*/AppKit.*/R*/StandardKeyBinding.dict, the shortcut is defined to be without method and therefore does nothing. It's preferable to create your own key bindings file like this rather than editing the system one.

1 Feel free to use a new XML property list style if you prefer—it works the same.

  • I am extremely thankful. It was exactly what I wanted. BTW I would appreciate if you could explain what '~' and ( ) do.
    – Kaunteya
    Jul 18, 2015 at 13:45
  • @Kaunteya Edited answer—does that help?
    – grg
    Jul 18, 2015 at 13:56
  • 1
    Does this work for anyone on MacOs? (Sierra?) No effect for me.. Jul 1, 2017 at 7:27
  • Is this safe to do in Big Sur (v11.0.1)?
    – Bn.F76
    May 15, 2021 at 19:10

The solution also might be to use different keyboard layout, e.g. U.S.:

  • problems with "alt" keys: U.S. International, ABC
  • solution: U.S.

Change it in System Preferences -> Keyboard -> Input Sources.

I found the solution on Stack Overflow here so you might give the author a credit if it helped you also ;)


For anyone finding this later and having problems with this.

I was unsuccessful doing this, and the other option with Ukelele has it's own problems (hard to remove default keyboard), so I ended up using BetterTouchTool to replace Option shortcuts with other actions.


I found that using the Unicode hex input input source (System Preferences > Keyboard > Input Sources, then add source and select Other under languages) worked for me. Found this after trying to change input sources based on @exmaxx's suggestion. NOTE: Using ABC (my default) or US did not solve the problem for me.

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