How to Turn Your Mac’s Caps Lock into an Extra Modifier Key

Mac Caps Lock KeyNick Beer / Shutterstock

Unless you’re prone to yelling on the Internet, you probably don’t use Caps Lock for much. That’s weird since it’s right next to a bunch of useful modifier keys. Here’s how to make Caps Lock as handy as the others.

What Can You Do With an Extra Modifier Key?

Perhaps the coolest thing to do is bind fully custom hotkeys. With the use of an app like BetterTouchTool, you can use an extra modifier key to add an empty slate of hotkeys to which you can attach actions. If you want to trigger a shell script or open a new email tab whenever you press Caps+B, you can do that.

You can do the same custom hotkeys without Caps Lock, but you’ll be stuck pressing weird combinations like Shift+Control+Command to not interfere with default shortcuts. With this method, any app that allows you to set your own hotkeys will support the new Caps Lock modifier.

You can also rebind existing shortcuts to use Caps Lock. If there’s an overly complicated shortcut that’s bugging you, you can rebind it in macOS’s keyboard settings to make it easier to press. For example, the hotkey in macOS to take a screenshot of a selection is Shift+Command+5, but you could rebind it to Caps+S.

Repurpose Caps Lock With Karabiner

Now, there’s no way to emulate an extra modifier key properly, so for compatibility reasons, a better way to get this functionality is to remap Caps Lock to act like you’re pressing the Shift, Control, Option, and Command keys at the same time. Since this is such an absurd combination, no app is going to require you to press every one of them for a hotkey, and there should be no interference.

This does mean you’ll lose out on combinations such as Caps Lock+Command, but it should work simply enough with any other alphanumeric key. You can remap Caps Lock to an extra function key, like the F13-20 keys, but it may not work as a hotkey in every app. You can also natively remap the Caps Lock key to Escape (or any other modifier key), but this doesn’t add any extra functionality; it just relocates the key.

RELATED: How to Get Your Mac’s Esc Key Back by Remapping Caps Lock

The app we’ll use to rebind Caps Lock is Karabiner, a free keyboard remapping tool for macOS. Download and install the app, and open the preferences. Under the “Complex Modifications” tab, add a new rule with the button at the bottom.

macOS Karabiner Elements

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