Subscript puts text below the baseline in Word

Subscript is a formatting option that moves selected text below the line of regular text and makes it smaller. In Microsoft Word, you can apply subscript to any text you've already typed, or you can turn subscript on before you type. The most common uses are chemical formulas (H₂O), mathematical notation, footnote or endnote markers, and scientific measurements.

Word offers three ways to add subscript: a keyboard shortcut (the fastest method), the Format menu, or the Home tab ribbon. All three methods work the same way — you select the text first, then apply the formatting. Once you know which route suits your workflow, you can switch between them depending on what you're doing.

Key Takeaways

  • The keyboard shortcut Ctrl+= (Windows) or Cmd+= (Mac) is the quickest way to toggle subscript on and off.
  • You must select text before applying subscript; if nothing is selected, the shortcut turns subscript mode on for whatever you type next.
  • The Format menu route works in all Word versions and lets you control the exact depth and size of subscript text through the Character dialog.
  • Subscript and superscript are separate formatting options; superscript raises text above the line instead of below it.
  • Subscript formatting is preserved in .docx and .doc files but will be lost if you save to plain text format.

Using the keyboard shortcut (Windows)

On Windows, press Ctrl and the equals sign (=) at the same time. This is the fastest method if you use subscript often. The equals sign is on the same key as the plus sign; you do not need to hold Shift.

If you have text selected when you press Ctrl+=, Word applies subscript to that text immediately. If nothing is selected, Word turns on subscript mode, and the next characters you type will appear as subscript until you press Ctrl+= again to turn it off.

To remove subscript from text that already has it, select the text and press Ctrl+= again. The formatting toggles off, and the text returns to normal size and position on the baseline.

Using the keyboard shortcut (Mac)

On Mac, press Cmd and the equals sign (=) at the same time. Like the Windows version, this works whether text is selected or not.

If you have text selected, subscript applies to it. If nothing is selected, subscript mode turns on for the next characters you type. Press Cmd+= again to turn subscript off and return to normal text formatting.

Using the Format menu

Open the Format menu at the top of the Word window and select Text, then Subscript. This route works the same way as the keyboard shortcut — select text first, then choose the option, or turn subscript mode on before typing.

The Format menu also gives you access to the Character dialog box, where you can see and adjust the exact position and size of subscript text if the default appearance does not suit your document. Select your text, open Format > Character, and look for the Position dropdown under Effects. This is useful when you need subscript to sit deeper or shallower than Word's standard placement.

Using the Home tab ribbon

In the Home tab of the ribbon, look for the subscript button in the Font group. It usually appears as an "x" with a small number below it. Click the button to apply subscript to selected text, or click it to turn subscript mode on before you type.

If you do not see the subscript button, your ribbon may be in a compact view. Click the arrow at the right side of the Font group to expand it and find the button. Once you locate it, you can click it repeatedly to toggle subscript on and off.

Subscript versus superscript

Superscript is the opposite of subscript — it raises text above the line instead of below it. In Word, superscript uses the keyboard shortcut Ctrl+Shift+= (Windows) or Cmd+Shift+= (Mac). Both options appear in the Format menu and the Home ribbon.

Choose subscript for chemical formulas and mathematical subscripts (like the "2" in H₂O or the "n" in aₙ). Choose superscript for exponents, footnote markers, and ordinal numbers (like the "st" in 1st or the "2" in x²). Understanding the difference helps you format scientific and technical documents correctly.

Removing subscript formatting

To remove subscript from text, select the text and press the subscript keyboard shortcut again (Ctrl+= on Windows, Cmd+= on Mac). The formatting toggles off and the text returns to normal size and position.

You can also use the Format menu or ribbon button to toggle subscript off. If you applied subscript by accident and want to undo it, press Ctrl+Z (Windows) or Cmd+Z (Mac) immediately. This works even if you have already moved to another part of the document.

Frequently Asked Questions

Can I change the size or position of subscript text?

Yes. Select the subscript text, open Format > Character, and look for the Position dropdown. You can adjust how far below the baseline the text sits and how much smaller it appears compared to regular text. This is especially useful when subscript needs to align with other elements in your document.

Does subscript work in all Word document types?

Subscript works in .docx files (Word 2007 and later), .doc files (older Word), and most other formats Word can open. If you save to a plain text format like .txt, subscript formatting will be lost because plain text does not support formatting.

What if the keyboard shortcut does not work?

Check that you are using the correct key combination for your operating system. On Windows, it is Ctrl and equals; on Mac, it is Cmd and equals. If it still does not work, use the Format menu or Home ribbon button instead.

Can I set subscript as the default for certain text?

You can create a custom style with subscript formatting built in, then apply that style to text. Open Format > Styles, create a new style, set it to subscript, and save it. Then apply the style whenever you need subscript text, which is faster than formatting each instance individually.

Will subscript display correctly when I print or share my document?

Yes. Subscript formatting is part of the document file itself, so it will display and print correctly on any computer that opens the file. The subscript text may look slightly different depending on the font and printer, but the positioning and size will remain consistent.