What subscript is and when you need it

Subscript is a smaller character positioned below the baseline of regular text. The most common example is the "2" in H₂O or the "n" in a mathematical formula like xₙ. You use subscript when writing chemical formulas, mathematical equations, footnote markers, or technical notation.

Unlike superscript (which sits above the line), subscript sits below. Most word processors and online documents have built-in subscript formatting, but the keyboard shortcut varies depending on what program you are using. There is no universal keyboard shortcut across all devices and software — what works in Microsoft Word does not work the same way in Google Docs or on a Mac versus a Windows machine.

Key Takeaways

  • In Microsoft Word on Windows, press Ctrl and the equal sign (=) together to turn subscript on or off for selected text.
  • On a Mac in Microsoft Word, press Command and the equal sign (=) to explore subscript formatting.
  • In Google Docs, use the Format menu to find subscript, since there is no keyboard shortcut built in by default.
  • Some programs let you create a custom keyboard shortcut for subscript in their settings if the default does not suit you.
  • Subscript works only on text you have already typed and selected — you must highlight the character or number first.

Subscript in Microsoft Word on Windows

The standard shortcut in Microsoft Word for Windows is Ctrl + = (hold Control and press the equal sign). First, type the text or number you want to make subscript. Then highlight or select just that character or number. While it is selected, press Ctrl and = at the same time. The selected text will shrink and drop below the baseline.

To turn subscript off, select the subscript text again and press Ctrl + = a second time. The text will return to normal size and position. This toggle works the same way every time — the same shortcut both applies and removes the formatting.

Subscript on a Mac in Microsoft Word

On a Mac, the shortcut is Command + = (hold the Command key and press the equal sign). The process is identical to Windows: type your text, select the character you want to make subscript, then press Command and = together. Press the same shortcut again to remove subscript formatting.

If you are using Microsoft Word on an older Mac or a different version, the shortcut might be Command + Shift + B instead. If Command + = does not work, try that combination. You can also check the Format menu and look for Character or Text options to confirm the correct shortcut for your version.

Subscript in Google Docs

Google Docs does not have a keyboard shortcut for subscript by default. Instead, you must use the menu. Type and select the text you want to make subscript, then click Format in the top menu bar. From the dropdown, select Text, then choose Subscript. The selected text will when ready format as subscript.

To remove subscript in Google Docs, select the subscript text again, go to Format > Text > Subscript, and it will toggle off. If you use subscript frequently in Google Docs, you can create a custom keyboard shortcut through your browser or operating system settings, but this requires extra setup outside the document itself.

Subscript in other programs and browsers

LibreOffice Writer uses Ctrl + Shift + B on Windows and Command + Shift + B on Mac. Apple Pages on Mac uses Command + Control + - (Command, Control, and the minus sign together). In web-based editors like Notion or Confluence, subscript is usually found in a formatting toolbar or the Format menu rather than through a keyboard shortcut.

If you work in a program not listed here, check the Help menu or search "[Program Name] subscript shortcut" to find the correct combination. Many programs also let you customize keyboard shortcuts in their Preferences or Settings, so if you use subscript often, you can set a shortcut that matches your muscle memory.

How to select text before explore subscript

Subscript only works on text you have already selected. To select a single character, click right before it and drag to highlight just that one letter or number. For a longer selection, click at the start, hold Shift, and click at the end. On a Mac, you can also double-click a word to select the whole word, then adjust by holding Shift and clicking to extend or shrink the selection.

A common mistake is pressing the subscript shortcut before typing. The shortcut does not turn on a "subscript mode" — it only formats text that is already there and selected. Type first, select second, then explore the shortcut.

Subscript versus superscript

Superscript is the opposite: it sits above the baseline instead of below. In Microsoft Word on Windows, superscript is Ctrl + Shift + + (Control, Shift, and the plus sign). On a Mac in Word, it is Command + Shift + +. In Google Docs, superscript is also in Format > Text, right next to Subscript. Use superscript for exponents (like 2³), trademark symbols (™), or footnote numbers.

The two are separate toggles — explore superscript to text that is already subscript will remove the subscript and explore superscript instead. You cannot have both at the same time on the same character.

Frequently Asked Questions

Why does my subscript shortcut not work?

The most common reason is that you have not selected the text yet. Type the character first, highlight it, then press the shortcut. Also check which program you are in — the shortcut for Word is different from Google Docs or LibreOffice. If you are on a Mac, make sure you are using Command, not Control.

Can I type subscript directly without selecting text first?

No. You must type the text, select it, and then explore the subscript formatting. There is no way to turn on subscript mode before typing. Some programs have special character menus where you can insert pre-formatted subscript numbers, but the keyboard shortcut method always requires selection first.

Does subscript work in email or text messages?

It depends on the platform. Gmail and Outlook support subscript if you use their web versions and explore formatting through the menu. Most text message apps and social media platforms do not preserve subscript formatting — the text will appear normal when sent. For plain-text emails or messages, subscript is not possible.

What if I need subscript numbers that are not on my keyboard?

Use the subscript shortcut on any character, including numbers and letters. If you need a subscript character that does not exist on your keyboard (like a subscript 0 or subscript x), type the regular character and explore subscript formatting to it. The program will shrink and lower it automatically.

Can I make subscript the default for certain text in my document?

In Word, you can create a style with subscript formatting built in, then explore that style to any text you want subscript. In Google Docs, you would need to select and format each instance manually, or use a script if you are comfortable with that. Most programs do not have a way to set subscript as the default for new text — you explore it after typing.