What a subscript hotkey does

A subscript hotkey is a keyboard shortcut that formats text to appear smaller and lower than the regular line of text — like the "2" in H₂O or the numbers in chemical formulas. Instead of clicking through menus, you press a combination of keys to make selected text subscript instantly.

The hotkey varies depending on which program you are using. Microsoft Word, Google Docs, LibreOffice, and other word processors each have their own default shortcuts, and you can often change them to whatever combination works best for you.

Key Takeaways

  • The subscript hotkey in Microsoft Word is Ctrl+= (hold Control and press the equals sign).
  • In Google Docs, you access subscript through Ctrl+, (Control and comma), and the shortcut can be customized in settings.
  • LibreOffice Writer uses Ctrl+Shift+B for subscript by default.
  • You must select the text you want to format before pressing the hotkey, or the formatting will apply to new text you type.
  • Most programs let you reassign hotkeys through preferences or settings if you want a different key combination.

Subscript hotkeys in Microsoft Word

In Microsoft Word on Windows, the default subscript hotkey is Ctrl+= (Control and the equals sign). On Mac, it is Cmd+= (Command and the equals sign). Select the text or number you want to make subscript, then press the hotkey. The text will shrink and drop below the baseline immediately.

If you want to turn subscript off and return to normal text, select the subscripted text and press the same hotkey again. Word toggles the formatting on and off with the same shortcut.

You can also change the hotkey to something else. Go to File > Options > Customize Ribbon > Keyboard Shortcuts, search for "Subscript," and assign a new key combination. This is useful if Ctrl+= is hard to reach on your keyboard or conflicts with another program you use.

Subscript hotkeys in Google Docs

Google Docs does not have a built-in subscript hotkey by default, but you can create one. Select the text you want to format, then use Ctrl+, (Control and comma) to open the keyboard shortcuts menu. Search for "subscript" and you will see the option to assign a custom hotkey.

Once you set a custom shortcut, it works the same way as in Word: select text and press your chosen key combination. The shortcut is saved to your Google account, so it will work on any device where you log in to Google Docs.

If you do not want to set a custom hotkey, you can also format subscript through the menu: select text, then click Format > Text > Subscript.

Subscript hotkeys in LibreOffice Writer

LibreOffice Writer uses Ctrl+Shift+B as the default subscript hotkey on both Windows and Mac. Select the text you want to format and press the combination. Like other programs, pressing it again toggles subscript off.

To change the hotkey in LibreOffice, go to Tools > Customize > Keyboard. Find "Subscript" in the function list, click it, enter your preferred key combination in the "New shortcut key" field, and click Assign. Your custom hotkey will be saved for future use.

How to use a subscript hotkey correctly

The most common mistake is pressing the hotkey before selecting text. The hotkey only formats text that is already selected. If you press it first, the formatting will apply to whatever you type next, which is rarely what you want.

The correct order is: (1) select the text or number you want subscript, (2) press the hotkey, (3) click elsewhere to deselect and see the result. If you make a mistake, press Ctrl+Z (or Cmd+Z on Mac) to undo and try again.

Subscript formatting is purely visual — it does not change the actual text or how the document behaves. You can search for the word normally, copy it to another program, and it will paste as regular text unless you reapply the subscript formatting.

When subscript hotkeys are useful

Subscript is most common in scientific and technical writing: chemical formulas (H₂SO₄), mathematical expressions, footnote numbers in some styles, and biological notation. If you write in these fields regularly, learning the hotkey saves time compared to using the menu every time.

Subscript is also used in some academic citations, trademark symbols, and ordinal numbers in certain contexts (though most modern writing uses superscript for those instead). The hotkey makes it fast to format these elements without interrupting your typing flow.

Frequently Asked Questions

What is the difference between subscript and superscript?

Subscript text appears below the baseline (like H₂O), while superscript appears above it (like E=mc²). Most programs have separate hotkeys for each. Superscript in Word is Ctrl+Shift+= on Windows and Cmd+Shift+= on Mac.

Can I use a subscript hotkey on my phone or tablet?

Most phone and tablet versions of Word, Google Docs, and LibreOffice do not have hotkeys because they use touch keyboards instead. You will need to use the menu or formatting toolbar to apply subscript on mobile devices.

Will subscript formatting stay if I copy text to another program?

It depends on the program. If you copy from Word to another Word document or to Google Docs, subscript usually stays. If you paste into a plain-text editor or email, the formatting will be lost and the text will appear normal.

Can I make a hotkey for subscript in Microsoft Excel or PowerPoint?

Yes. Excel and PowerPoint use the same hotkey system as Word (Ctrl+= on Windows, Cmd+= on Mac), and you can customize them the same way through File > Options > Customize Ribbon > Keyboard Shortcuts.

What if my hotkey is not working?

Check that you have text selected before pressing the hotkey. Also verify you are using the correct key combination for your program and operating system. If another program is running, it may be intercepting the hotkey — try closing other applications and trying again.