What subscript is and when you need it

Subscript is text that sits slightly below the normal line of text, usually in a smaller size. The most common use is in chemistry and math: H₂O for water, or writing an exponent like x₂. You might also see it in footnotes, chemical formulas, or mathematical notation.

Most word processors and online tools have a subscript button or keyboard shortcut. The method depends on what program you're using — Microsoft Word works differently from Google Docs, which works differently from a plain text editor. Once you know where the button is in your program, the process is the same every time.

Key Takeaways

  • In Microsoft Word, select the text you want as subscript, then press Ctrl+= (Windows) or Cmd+= (Mac), or use the Format menu.
  • In Google Docs, select your text and use Format > Text > Subscript from the menu, or press Ctrl+, (comma) on Windows or Cmd+, on Mac.
  • In most web forms and plain text editors, subscript is not available — you may need to use a workaround like typing the number separately or using HTML code.
  • Always select the text first before applying subscript; if nothing is selected, the button won't work.

Subscript in Microsoft Word

Open your document and find the text you want to make subscript. Click at the start of that text and drag to select it — for example, if you're writing H₂O, select just the "2". You can also double-click a single character to select it quickly.

Once the text is selected, press Ctrl+= on Windows or Cmd+= on Mac. The text will immediately drop below the line and shrink. To undo subscript on selected text, press the same keys again.

If the keyboard shortcut doesn't work, you can use the menu instead. Go to Home tab, then click the small arrow next to the font formatting options. Select Font, then click the Subscript checkbox under Effects. Click OK.

Subscript in Google Docs

Select the text you want as subscript by clicking and dragging. Then go to the Format menu at the top, hover over Text, and click Subscript. The text will drop below the line immediately.

On Windows, you can also use the keyboard shortcut Ctrl+, (Ctrl and comma). On Mac, use Cmd+,. To remove subscript from selected text, use the same shortcut or menu option again.

Subscript in other word processors and online tools

LibreOffice Writer works similarly to Microsoft Word: select your text, then go to Format > Text > Subscript, or press Ctrl+Shift+B on Windows. On Mac, the keyboard shortcut is Cmd+Shift+B.

Apple Pages has a Format panel on the right side of the screen. Select your text, then click the Format button, find the text options, and look for subscript. Some online writing tools like Notion or Medium do not support subscript formatting — in those cases, you may need to type the text as-is or use a workaround.

What to do when subscript isn't available

If you're working in a plain text editor, email, or a web form that doesn't support subscript, you have a few options. The simplest is to type the text normally and note that it's subscript in context — most readers will understand that H2O means water even without the subscript formatting.

If you need subscript in an email or web form, you can try copying and pasting a subscript character from another source. Search online for "subscript generator" and paste your text into the tool — it will convert numbers and letters to subscript Unicode characters that work in most places. Keep in mind that some email clients and phones may not display these characters correctly.

For HTML code on a website, use the <sub> tag. Type <sub>2</sub> around the character you want as subscript, so H<sub>2</sub>O will display as H₂O in a browser.

Common mistakes and how to fix them

The most common mistake is forgetting to select the text before pressing the subscript button or shortcut. If you press Ctrl+= without selecting anything, nothing will happen. Always highlight the text first, even if it's just one character.

Another mistake is applying subscript to the wrong part of a formula. For example, in H₂O, only the "2" should be subscript — not the H or the O. Take a moment to select exactly what you need before applying the formatting.

If subscript text looks too small or hard to read, you can select it again and increase the font size slightly while keeping the subscript formatting. This is especially useful in presentations or documents meant to be read on screen.

Frequently Asked Questions

Can I use subscript in email?

Most email clients strip out subscript formatting when you send the message. If you need subscript in email, use a subscript generator to convert text to Unicode subscript characters, or simply type the text normally and let context make the meaning clear.

How do I make superscript instead of subscript?

Superscript (text above the line) uses the same process. In Word, press Ctrl+Shift+= instead of Ctrl+=. In Google Docs, go to Format > Text > Superscript, or press Ctrl+. (period) on Windows or Cmd+. on Mac.

Why isn't the subscript button working?

Make sure you have selected the text you want to format. If nothing is selected, the subscript command won't do anything. Also check that you're using the correct keyboard shortcut for your program and operating system.

Can I make subscript in a spreadsheet?

Yes, in Excel or Google Sheets, select the text inside a cell, then use the same subscript method as you would in Word or Docs. The formatting will stay with that cell.