What subscript is and when you need it

Subscript is text that sits below the baseline of regular text, usually smaller and to the right. You see it in chemical formulas (H₂O), mathematical equations, footnote numbers, and some technical writing. Most word processors and online forms let you apply subscript with a keyboard shortcut instead of hunting through menus.

The shortcut saves time when you're typing something that needs subscript repeatedly — like a chemistry report, a math assignment, or a form with numbered references. Once you know the shortcut for your specific tool, you can toggle subscript on and off without breaking your typing rhythm.

Key Takeaways

  • In Microsoft Word, press Ctrl+= (Windows) or Cmd+= (Mac) to turn subscript on or off for the text you type next.
  • In Google Docs, use Ctrl+, (comma) on Windows or Cmd+, on Mac to apply subscript to selected text.
  • In most web forms and email, subscript shortcuts do not work — you must use the Format menu or special character codes instead.
  • The subscript shortcut only affects text you type after activating it, so select your text first if you want to convert existing words.
  • If a shortcut does not work, check whether your application supports subscript and whether you are using the correct operating system version.

Microsoft Word subscript shortcut

In Microsoft Word on Windows, press Ctrl and the equals sign (=) together. On Mac, press Cmd and the equals sign (=). The text you type after pressing the shortcut will appear in subscript until you press the same shortcut again to turn it off.

If you have text already written that you want to convert to subscript, select it first, then press the shortcut. Word will shrink and lower the selected text immediately. This works the same way whether you are using Word on your desktop or Word Online in a browser.

Google Docs subscript shortcut

In Google Docs on Windows, press Ctrl and the comma (,) together. On Mac, press Cmd and the comma (,). Like Word, you can either press the shortcut before typing new text, or select existing text and press it to convert what you have already written.

Google Docs subscript works in the same document whether you are on a computer or using the mobile app, though the mobile app does not have a keyboard shortcut — you will need to use the Format menu instead. The shortcut applies only within your document; it does not work in Google Sheets or Google Slides.

Why shortcuts do not work in web forms and email

Most email clients and web-based forms do not support subscript formatting at all, so no shortcut will work. Gmail, Outlook web, and most contact forms strip out subscript when you submit them. If you need subscript in an email or form, you have a few options: paste an image of the text, use a special character code if the form accepts HTML, or type a note explaining what the subscript means (for example, "H2O" with a note that the 2 should be subscript).

Some online tools like Notion and Slack do support subscript through their Format menus, but keyboard shortcuts vary or do not exist. Check the application's help documentation to see whether subscript is available and how to access it.

How to remember which shortcut goes with which program

Word uses Ctrl+= (or Cmd+=) because the equals sign visually suggests balance and alignment — subscript aligns text to the baseline. Google Docs uses Ctrl+, (or Cmd+,) because the comma is a smaller, lower mark on the keyboard, matching what subscript looks like on the page. Neither shortcut is universal across all programs, so if you switch between tools often, write both down or bookmark this page.

If you cannot remember the shortcut in the moment, you can always use the Format menu: in Word, go to Format > Text > Subscript; in Google Docs, go to Format > Text > Subscript. The menu route takes longer but works the same way.

Troubleshooting when the shortcut does not work

If you press the shortcut and nothing happens, first check that you are using the right program and operating system. A Windows shortcut will not work on Mac, and a Word shortcut will not work in Google Docs. Second, make sure you are pressing the correct keys — the equals sign on the main keyboard, not the one on the numeric keypad, and the comma key, not a period or semicolon.

If you are certain you have the right shortcut and keys, the application may not support subscript, or your version may be outdated. Try using the Format menu instead. If the menu option is also missing, subscript is not available in that tool, and you will need to use one of the workarounds described above.

Superscript shortcut (the opposite of subscript)

If you need text that sits above the baseline instead of below — for exponents, trademark symbols, or footnote numbers — use the superscript shortcut. In Word, press Ctrl+Shift+= (Windows) or Cmd+Shift+= (Mac). In Google Docs, press Ctrl+. (period) on Windows or Cmd+. on Mac.

Superscript and subscript use the same toggle logic: press the shortcut to turn it on, type your text, then press it again to turn it off. You can also select existing text and press the shortcut to convert it. The same limitations apply — superscript does not work in most email clients or web forms.

Frequently Asked Questions

Can I use subscript in a Google Sheet or Slide?

Google Sheets and Slides do not support subscript formatting through the keyboard shortcut or the Format menu. You can insert an image or use a workaround like typing the number normally and adding a note, but native subscript is not available in those tools.

What if I need subscript in an email I am sending?

Most email services strip subscript formatting when you send the message. Your best option is to type the text normally and add a note in parentheses explaining which part should be subscript, or paste a screenshot of the formatted text if the content is short.

Does the subscript shortcut work on my phone or tablet?

Keyboard shortcuts generally do not work on mobile devices because they lack physical keyboards. Use the Format menu in your app instead. On Google Docs mobile, open the Format menu, tap Text, and select Subscript.

Why does my subscript text look different in different programs?

Each program uses its own font and sizing rules for subscript. Word and Google Docs may render the same subscript text at slightly different sizes or positions. This is normal and does not affect how the document prints or displays to others.

Can I undo subscript formatting with the same shortcut?

Yes. Pressing the subscript shortcut a second time toggles it off. If you have text selected, pressing the shortcut again removes the subscript formatting from that text.