The fastest way to add subscript to text

Subscript is a smaller character positioned below the baseline of regular text — like the "2" in H₂O or the "n" in aₙ. Most programs let you create subscript with a keyboard shortcut instead of hunting through menus.

The shortcut depends on which program you're using. In Microsoft Word and Google Docs on Windows, press Ctrl + = (hold Control and press the equals sign). On Mac in these same programs, press Cmd + =. In Excel, the shortcut is identical. These shortcuts toggle subscript on and off, so pressing them again returns text to normal size.

Some programs don't have a built-in keyboard shortcut and require you to use the Format menu instead. LibreOffice Writer, for example, uses Ctrl + Shift + B on Windows and Cmd + Shift + B on Mac. If a shortcut doesn't work in your program, check the Format menu under Character, Text, or Font — subscript is usually listed there with its keyboard equivalent shown next to it.

Key Takeaways

  • In Microsoft Word and Google Docs, use Ctrl + = on Windows or Cmd + = on Mac to toggle subscript on and off.
  • Excel uses the same shortcut as Word: Ctrl + = on Windows or Cmd + = on Mac.
  • LibreOffice Writer uses Ctrl + Shift + B on Windows or Cmd + Shift + B on Mac.
  • If a shortcut doesn't work, open the Format menu and look for Character or Font options to find subscript there.

How to use subscript in Word and Google Docs

Select the character or number you want to make subscript first. Highlight it by clicking and dragging across it, or double-click a single character to select it. Then press the shortcut for your operating system: Ctrl + = on Windows or Cmd + = on Mac.

The selected text shrinks and drops below the baseline when ready. If you want to type new subscript text instead of converting existing text, press the shortcut before you start typing. Everything you type will appear in subscript until you press the shortcut again to turn it off. This works the same way in both Word and Google Docs.

Subscript in Excel and other spreadsheet programs

Excel uses the same keyboard shortcut as Word. Select the cell containing the text you want to modify, then double-click the cell to enter edit mode. Highlight the character or number that should be subscript and press Ctrl + = on Windows or Cmd + = on Mac.

Google Sheets does not have a keyboard shortcut for subscript. Instead, select the text in the cell, then go to Format > Text > Subscript from the menu. Other spreadsheet programs like LibreOffice Calc use the same shortcut as LibreOffice Writer: Ctrl + Shift + B on Windows or Cmd + Shift + B on Mac.

What to do if the shortcut doesn't work

Some keyboard layouts or programs may not recognize the standard shortcut. If Ctrl + = doesn't work, try accessing subscript through the Format menu. In Word, go to Format > Text > Subscript. In Google Docs, go to Format > Text > Subscript. The menu path is usually similar across programs.

On some keyboards, especially laptops, the equals sign may require you to hold Shift as well. Try Ctrl + Shift + = on Windows or Cmd + Shift + = on Mac. If none of these work, your program may not support keyboard shortcuts for subscript, and the Format menu will be your only option.

Subscript in web browsers and email

Most web-based text editors, including Gmail and Outlook online, do not support keyboard shortcuts for subscript. These programs usually offer subscript through a toolbar button or Format menu. Look for an icon that shows a small letter or number below a baseline, or check the Format menu for Text or Character options.

Some websites that let you write formatted text — like document collaboration tools or content management systems — may have their own shortcuts. Check the help documentation or look for a keyboard shortcuts guide within the program. If you're unsure, the Format menu is always a reliable fallback.

Superscript vs. subscript shortcuts

Superscript is the opposite of subscript: a smaller character positioned above the baseline, like the "2" in x². The keyboard shortcut for superscript is similar but slightly different. In Word and Google Docs on Windows, press Ctrl + Shift + + (Control, Shift, and the plus sign). On Mac, press Cmd + Shift + +.

In LibreOffice Writer, superscript uses Ctrl + Shift + P on Windows or Cmd + Shift + P on Mac. Remember: subscript goes down (Ctrl + =), and superscript goes up (Ctrl + Shift + +). Both toggle on and off with the same shortcut, so you can switch between normal, subscript, and superscript text in the same document.

Frequently Asked Questions

Why does Ctrl + = not work on my keyboard?

On some keyboards, especially laptop keyboards, the equals sign requires Shift to be held down. Try pressing Ctrl + Shift + = instead. If that still doesn't work, your keyboard layout or program may not support the standard shortcut — use the Format menu instead.

Can I use subscript in plain text files?

No. Subscript is a formatting feature that only works in programs that support rich text, like Word, Google Docs, or email clients. Plain text files (.txt) cannot store formatting. If you need subscript, save your document as .docx, .odt, or another format that preserves formatting.

Does subscript work the same way in PowerPoint?

Yes. In PowerPoint on Windows, select the text and press Ctrl + =. On Mac, press Cmd + =. The shortcut works in text boxes, slide titles, and speaker notes. If the shortcut doesn't work, go to Format > Text > Subscript from the menu.

What if I need subscript in a social media post?

Most social media platforms do not support subscript formatting in regular posts. Some platforms may have limited formatting options in specific areas. Your best option is to use Unicode subscript characters if the platform supports them, or mention subscript in plain text — for example, write "H2O" instead of "H₂O".

Can I undo subscript formatting with a keyboard shortcut?

Yes. Press the same shortcut again to toggle subscript off. If you've already moved on to other text, select the subscript text and press the shortcut to return it to normal size. You can also use Ctrl + Z (or Cmd + Z on Mac) to undo the last formatting change.