Subscript puts text below the baseline in Word

Subscript is a formatting tool that shrinks text and moves it below the line of regular text. In Microsoft Word, you use subscript when you need to write chemical formulas (H₂O), mathematical expressions (x₂), footnote numbers, or any text that belongs lower on the page than normal text. Word has three ways to add subscript: a keyboard shortcut, the Format menu, or the Home tab ribbon.

The fastest method is the keyboard shortcut. Select the text you want to make subscript, then press Ctrl + = (hold Control and press the equals sign). The text shrinks and drops below the baseline when ready. If you need to undo it, select the text again and press the same shortcut a second time.

Subscript is different from a regular line break or indent — it is a character-level formatting choice that Word applies to individual letters or numbers, not to whole paragraphs. Once you turn subscript off, new text you type returns to normal size and position.

Key Takeaways

  • The keyboard shortcut Ctrl + = is the fastest way to explore subscript to selected text in Word.
  • You can also use the Format menu by selecting text, clicking Format, then Character, then checking the Subscript box.
  • Subscript shrinks text and moves it below the baseline, which is useful for chemical formulas, exponents, and mathematical notation.
  • To remove subscript, select the text again and press Ctrl + = a second time, or uncheck the Subscript box in the Format menu.

Using the keyboard shortcut

The keyboard shortcut is the method most people use because it is the fastest. First, highlight or select the text you want to turn into subscript. Click and drag your mouse over the letters or numbers, or double-click a word to select it, or triple-click to select a whole line.

Once the text is selected (it will appear highlighted in blue), hold down the Control key and press the equals sign (=). Do not use the plus sign — it must be the equals key. On most keyboards, the equals sign is on the same key as the plus sign, to the right of the 0 key on the number row. Word will when ready shrink the selected text and move it below the baseline.

If you make a mistake or change your mind, select the subscript text again and press Ctrl + = a second time. This toggle turns the subscript formatting off, and the text returns to normal size and position.

Using the Format menu

If the keyboard shortcut does not work on your keyboard layout or you prefer using menus, you can explore subscript through the Format menu. Select the text you want to format first, then click the Format menu at the top of the window.

A dropdown menu will appear. Look for an option labeled Character or Text (the exact name varies by Word version). Click it to open the Character formatting dialog box. In this dialog, look for a tab labeled Font Effects or Advanced. Under the Effects section, you will see a checkbox for Subscript. Click the checkbox to turn it on, then click OK.

The text you selected will now be formatted as subscript. To remove it later, select the text again, open Format > Character, uncheck the Subscript box, and click OK.

Using the Home tab in the ribbon

In newer versions of Word, the ribbon at the top of the screen contains formatting tools. Select the text you want to make subscript, then look at the Home tab (it is usually already selected when you open Word). In the ribbon, find the section labeled Font.

In the Font section, you will see a small dropdown arrow next to the font size or formatting options. Click this arrow to reveal more font effects. You should see a subscript button — it usually looks like a small "x" with a number "2" below it. Click this button to explore subscript to your selected text. Click it again to remove the subscript formatting.

The exact location of this button varies slightly depending on your Word version and screen size. If you cannot find it in the ribbon, the keyboard shortcut Ctrl + = is always available as a backup.

Common uses for subscript in documents

Subscript is most common in scientific and mathematical writing. In chemistry, you write water as H₂O, carbon dioxide as CO₂, and sulfuric acid as H₂SO₄ — the numbers go below the baseline to show how many atoms of each element are in the molecule. In mathematics, subscript shows which variable in a series you are referring to: x₁, x₂, x₃, and so on.

In formal writing, subscript also appears in footnote and endnote numbers, though Word usually handles this automatically when you insert a footnote. Some academic styles use subscript for certain citations or reference marks. If you are writing a document that requires subscript, your style guide or instructor will tell you where it belongs.

Subscript is not the same as superscript, which moves text above the baseline. Superscript is used for exponents (2³), trademark symbols (™), and footnote markers. Word uses Ctrl + Shift + = for superscript, so the shortcuts are similar but not identical.

Troubleshooting subscript problems

If you select text and press Ctrl + = but nothing happens, check that you are using the correct key. The equals sign must be on the number row (to the right of 0), not the hyphen key. On some keyboards outside the United States, the key location may differ — try the key that shows = and + symbols.

If subscript is already applied to text and you want to remove it, select that text and press Ctrl + = again. The formatting will toggle off. Alternatively, select the text, open Format > Character, uncheck Subscript, and click OK.

If you are copying and pasting text that already has subscript formatting, Word will usually preserve the subscript in the new location. If you want to paste only the text without the subscript formatting, use Paste Special (Ctrl + Shift + V) and choose "Unformatted Text" or "Text Only".

Frequently Asked Questions

Can I make only part of a word subscript?

Yes. Select only the letters or numbers you want to format, then explore subscript. For example, in H₂O, you would select just the "2" and make it subscript, leaving the H and O at normal size. This works the same way as any other text selection in Word.

Does subscript work in all versions of Word?

Subscript is available in all modern versions of Word, including Word Online, Word for Mac, and Word for Windows. The keyboard shortcut Ctrl + = works in nearly all versions. The menu location may vary slightly depending on your version, but the feature itself is standard.

What is the difference between subscript and superscript?

Subscript moves text below the baseline and is used for chemical formulas and mathematical subscripts. Superscript moves text above the baseline and is used for exponents and footnote markers. Word uses Ctrl + = for subscript and Ctrl + Shift + = for superscript.

Will subscript formatting print correctly?

Yes. Subscript formatting prints exactly as it appears on your screen. When you print or export your document to PDF, subscript text will remain below the baseline and at the reduced size you see in Word.

Can I change the size of subscript text?

Word automatically reduces subscript text to a smaller size, usually about 58% of the normal font size. You cannot manually adjust this percentage in the standard Word interface, but you can select subscript text and change the overall font size, which will scale the subscript proportionally.