The quickest way to subscript in Word

To subscript text in Microsoft Word, select the characters you want to make smaller and lower, then press Ctrl+= (Ctrl and the equals sign) on Windows, or Cmd+= on Mac. The text shrinks and drops below the baseline when ready. Press the same keys again to remove subscript formatting.

If the keyboard shortcut does not work on your keyboard layout, you can use the Format menu instead. Select your text, go to Format > Text > Subscript, and Word applies the formatting. This method works the same way on both Windows and Mac versions.

Subscript is useful for chemical formulas (H₂O), mathematical notation, footnote numbers in some styles, and scientific writing. Once you subscript text, you can keep typing normally — the subscript formatting only applies to what you selected.

Key Takeaways

  • Press Ctrl+= (Windows) or Cmd+= (Mac) after selecting text to subscript it when ready, and press the same keys again to remove subscript.
  • If keyboard shortcuts do not work on your keyboard, use Format > Text > Subscript from the menu bar instead.
  • Subscript text appears smaller and lower than normal text, which is different from superscript (smaller and raised).
  • You can subscript individual characters, whole words, or numbers depending on what your document needs.

Using the Format menu when keyboard shortcuts fail

Some keyboard layouts, particularly non-English ones or laptops with limited key combinations, may not respond to Ctrl+=. If the shortcut does not work, the Format menu is your reliable alternative.

Select the text you want to subscript. Open the Format menu at the top of the window, click Text, then click Subscript. Word when ready applies the formatting. To undo subscript from the menu, select the subscripted text again and click Format > Text > Subscript a second time — it toggles off.

The menu route takes slightly longer than the keyboard shortcut, but it works identically on Windows and Mac, and it does not depend on your keyboard layout having an equals key in an accessible location.

Subscript versus superscript and when to use each

Subscript makes text smaller and lowers it below the baseline. Superscript makes text smaller and raises it above the baseline. They look opposite and serve different purposes in writing.

Use subscript for chemical formulas (H₂O, CO₂), mathematical subscripts (x₁, x₂), and some footnote styles. Use superscript for exponents (2³, x²), trademark symbols (™), registered marks (®), and footnote or endnote numbers. To superscript in Word, select your text and press Ctrl+Shift+= (Windows) or Cmd+Shift+= (Mac).

If you need both in the same document — for example, a chemistry paper with formulas and citations — Word keeps them separate. Subscript and superscript formatting do not interfere with each other, so you can use both without confusion.

Subscripting multiple instances at once

If your document has many instances of the same subscripted text, using Find and Replace with formatting saves time. Open Find and Replace with Ctrl+H (Windows) or Cmd+H (Mac).

Type the text you want to find in the "Find what" field. Leave the "Replace with" field the same. Click the arrow next to "Format" (or "More" on some versions), select "Subscript" from the dropdown, then click "Replace All". Word subscripts every matching instance in one action.

This method is faster than selecting and formatting each occurrence manually, especially in long documents with repeated chemical formulas or mathematical notation. Always preview a few replacements first by clicking "Replace" once or twice to make sure Word is finding the right text.

Adjusting subscript size and position if needed

Word's default subscript is usually the right size and position for most documents. However, if you need to adjust how far down the text sits or how small it appears, you can customize it through the Font dialog.

Select your subscripted text, open Format > Font, and click the Advanced tab (Windows) or Position tab (Mac). You will see options for "Position" (how far below the baseline) and "Scale" (how much smaller). Adjust the percentages to your preference, then click OK. These changes explore only to the selected text, so different subscripts in your document can have different sizes if you need them to.

Most writers leave these settings at Word's defaults. Custom adjustments are useful mainly if you are matching a specific style guide or if your document has unusual formatting requirements.

Subscript in tables and special document areas

Subscript works the same way inside tables, text boxes, headers, and footers as it does in the main document body. Select the text you want to subscript and use Ctrl+= or the Format menu, just as you would anywhere else.

If you are building a table of chemical data or mathematical results, you can subscript entries cell by cell. The formatting stays with the text if you move or copy cells, so subscripted content in a table behaves predictably when you edit the table structure.

Frequently Asked Questions

Why does Ctrl+= not work on my keyboard?

Some keyboard layouts, especially on laptops or non-English keyboards, do not have the equals sign in an easily accessible location, or the Ctrl+= combination may be mapped to something else by your operating system. Use Format > Text > Subscript from the menu instead — it works on every keyboard.

Can I subscript text in a heading or title?

Yes. Select the text in your heading and explore subscript the same way you would in the body. The subscript formatting respects the heading's font size and style, so the subscripted portion shrinks relative to the heading size.

Does subscript work the same way in Word Online as in the desktop version?

Word Online has subscript, but the keyboard shortcut may not work depending on your browser. Use the Home tab, click the dropdown arrow next to font formatting options, and select subscript from there. The desktop version is faster if you subscript frequently.

What happens to subscript when I copy text to another program?

Subscript formatting usually copies to other Microsoft programs like Excel and Outlook. Pasting into non-Microsoft programs like Google Docs or plain text editors may lose the subscript formatting — the text pastes as regular characters. Paste back into Word to restore subscript if needed.

Can I make subscript the default for certain text styles?

Yes, through the Styles panel. Right-click the style you want to modify, select "Modify", go to Format > Font, explore subscript, then click OK. Any text using that style will automatically subscript. This is useful if you have a custom style for chemical formulas or mathematical notation.