The fastest way to add subscript in Word

To make text subscript in Microsoft Word, select the characters you want to shrink and move below the baseline, then press Ctrl+= (Ctrl and the equals sign) on Windows, or Cmd+= on Mac. The text instantly becomes smaller and drops below the line. Press the same keys again to turn subscript off.

That keyboard shortcut works in Word on desktop, in Word Online, and in most other Microsoft Office programs. If you forget the shortcut, you can also use the menu: select your text, go to the Home tab, click the small arrow next to the font formatting options, choose Font, then check the Subscript box.

Key Takeaways

  • Press Ctrl+= (Windows) or Cmd+= (Mac) to toggle subscript on and off for selected text.
  • Subscript shrinks text and moves it below the baseline, commonly used for chemical formulas like H₂O and mathematical notation.
  • You can access subscript through the Home tab menu if you prefer not to use the keyboard shortcut.
  • The same shortcut works in Word Online, Excel, and PowerPoint, so you do not need to learn different steps for each program.

When you need subscript: common uses

Subscript appears most often in scientific and mathematical writing. Chemical formulas need it—H₂O, CO₂, and H₂SO₄ all require the numbers to sit below the line. In mathematics, subscript identifies variables or elements in a sequence, like x₁, x₂, or aₙ.

You may also see subscript in footnote references (though Word usually handles those automatically), in trademark or copyright notation, or when writing about isotopes and chemical compounds in academic papers. If you are writing a document that does not involve chemistry, math, or technical notation, you probably will not need subscript at all.

Using the menu instead of the keyboard shortcut

If the keyboard shortcut does not work or you prefer clicking, the menu route takes a few more steps but arrives at the same place. First, select the text you want to make subscript by clicking and dragging across it.

Then click the Home tab at the top of the ribbon. In the font formatting section (usually on the left side), look for a small arrow or dropdown next to the font options. Click it to open the Font dialog box. In that box, find the Effects tab, check the box next to Subscript, and click OK. The text shrinks and drops immediately.

Superscript: the opposite of subscript

Word also offers superscript, which raises text above the baseline instead of lowering it below. Superscript is used for exponents (2³ = 8), footnote markers, trademark symbols (™), and ordinal numbers (1st, 2nd, 3rd).

To add superscript, select your text and press Ctrl+Shift+= on Windows or Cmd+Shift+= on Mac. The keyboard shortcut is almost identical to subscript—just add the Shift key. You can also reach it through the same Font dialog box by checking Superscript instead of Subscript.

Fixing subscript that looks wrong

Sometimes subscript text appears too small or sits too far below the line, especially if you have mixed font sizes in your document. This usually happens when Word is trying to fit subscript into a line of text that already has unusual spacing or font settings.

To adjust it, select the subscript text again and open the Font dialog box (Home tab, then the font arrow). Click the Advanced tab and look for the Position option. You can manually raise or lower the text by entering a point value. Most of the time, the default subscript setting works fine, but this option exists if you need fine control.

Subscript in Word Online and mobile

Word Online (the browser version) supports subscript through the same keyboard shortcut: Ctrl+= on Windows or Cmd+= on Mac. The menu route also works—click Home, find the font options, and look for the subscript button (it usually shows an "x" with a small number below it).

On mobile Word apps (iPhone, iPad, Android), subscript is available but the steps vary slightly depending on your device. On iPad, select text and tap the arrow next to the font options to find subscript. On Android, the process is similar but the menu layout may differ. If you use mobile Word regularly, the keyboard shortcut is usually faster than hunting through menus.

Copying subscript text without losing the formatting

When you copy subscript text from one place in your document to another, Word preserves the subscript formatting automatically. Paste it normally (Ctrl+V or Cmd+V) and it stays subscript.

If you paste subscript into a different program—like an email, a web form, or Google Docs—the formatting may not carry over. Most web-based tools do not recognize Word's subscript code. If you need subscript in another program, check whether that program has its own subscript feature, or paste as plain text and reapply subscript manually using that program's tools.

Frequently Asked Questions

Why does my subscript look different from someone else's subscript?

Different fonts render subscript at slightly different sizes and positions. If you change the font in your document, the subscript adjusts automatically but may look noticeably higher or lower. This is normal and does not mean anything is wrong. The subscript formatting itself is the same; only the visual appearance changes with the font.

Can I make subscript the default for certain text?

You can create a style that includes subscript formatting, then apply that style to any text you want to be subscript automatically. Go to Home, right-click on a style in the styles panel, choose Modify, click Format, select Font, check Subscript, and save. After that, applying the style makes text subscript instantly.

Does subscript work in Word tables?

Yes. Select the text inside a table cell and use the same keyboard shortcut (Ctrl+= or Cmd+=) or the menu route. Subscript works exactly the same way inside tables as it does in regular document text.

What if the keyboard shortcut does not work?

On some keyboards, especially laptops, the equals sign may require Shift or a function key. Try Ctrl+Shift+= instead. If that does not work, use the menu route through Home > Font dialog instead. You can also customize the keyboard shortcut in Word settings if you want to assign a different key combination.