The fastest way to type subscript depends on your program

Subscript makes text smaller and lowers it below the baseline — useful for chemical formulas like H₂O, footnote numbers, or mathematical expressions. The method changes depending on whether you use Microsoft Word, Google Docs, Excel, or a web browser. Most programs offer a keyboard shortcut as the quickest route, though a menu option works if you forget the keys.

In all three programs, the process is the same: select the text you want to format, then press the keyboard shortcut or use the Format menu. The text shrinks and drops immediately. You cannot turn on subscript mode and then type — you must select first, then format.

Key Takeaways

  • In Microsoft Word and Excel on Windows, press Ctrl and the equal sign together while the text is selected to make subscript; on Mac, press Cmd and the equal sign.
  • Google Docs uses Ctrl+Comma on Windows or Cmd+Comma on Mac to create subscript from selected text.
  • If you forget the keyboard shortcut, all three programs have a Format menu where you can find subscript as a text option.
  • You must select the text first before applying subscript — typing subscript mode and then typing does not work the same way in most programs.
  • Subscript reverts to normal text after you type the next character, so each subscript section needs to be formatted separately.

Subscript in Microsoft Word

Select the text you want to make subscript. On Windows, hold Ctrl and press the equal sign (=). On Mac, hold Cmd and press the equal sign. The text shrinks and drops below the line immediately.

If the keyboard shortcut does not work or you prefer a menu, go to the Home tab, click the small arrow next to the font formatting options, and select "Subscript" from the dialog box. You can also right-click the selected text, choose Font, and check the Subscript box. To return text to normal, select it again and press the same keyboard shortcut a second time, or uncheck Subscript in the menu.

Subscript in Google Docs

Select the text you want to make subscript. On Windows, hold Ctrl and press the comma key (,). On Mac, hold Cmd and press the comma key. The text shrinks and lowers immediately.

Alternatively, go to Format in the menu bar, select Text, and click Subscript. This route takes longer but works if you do not remember the keyboard shortcut. To undo subscript, select the text again and press Ctrl+Comma (Windows) or Cmd+Comma (Mac) a second time.

Subscript in Microsoft Excel

Select the text or numbers you want to make subscript. On Windows, hold Ctrl and press the equal sign (=). On Mac, hold Cmd and press the equal sign. The text shrinks and drops below the baseline.

If you need the menu route, go to Home, click the small arrow next to the font options, select Font, and check Subscript in the dialog box. Note that subscript in Excel works on text within a cell, not on cell references or formulas. If you type a formula like =H2O, the 2 will not subscript automatically — you must format it manually after typing.

Subscript in web browsers and online tools

Most web-based text editors like Google Docs (covered above) use Ctrl+Comma or Cmd+Comma. Some other online tools have a subscript button in the toolbar that looks like a small "x" with a number below it.

If you are typing in a plain text box on a website with no formatting toolbar, subscript is usually not available. Plain text fields do not support formatting. If the site has a rich text editor (buttons for bold, italic, etc.), look for a subscript button or check the Format menu.

What happens after you type subscript

Subscript formatting applies only to the text you selected before pressing the shortcut. Once you press the shortcut and the text is formatted, your cursor returns to normal text mode. If you type more characters, they will be regular size and baseline position, not subscript.

This means for a formula like H₂O, you must type H, select the 2, apply subscript, then type O. You cannot type H, press a subscript mode button, type 2O, and have only the 2 be subscript. Each subscript section requires its own selection and formatting step.

Troubleshooting subscript that does not work

If the keyboard shortcut does not work, check that you have text selected. Many people press the shortcut first and then type, expecting subscript mode to turn on — this does not work in most programs. Select the text first, then apply the formatting.

If you are using a laptop with a compact keyboard, the equal sign might be on a different key or require Shift. Try Ctrl+Shift+Equal or look for the equal sign on your keyboard and press it with Ctrl held down. In Google Docs, if Ctrl+Comma does not work, your keyboard layout or browser extension might be intercepting the shortcut. Try the Format menu instead, or check if your keyboard has a different comma key location.

Frequently Asked Questions

Can I type subscript without selecting text first?

Not in the traditional way. You must select text and then apply subscript formatting. Some programs like Word have a subscript button you can toggle on and off, but this is less reliable than selecting first. The select-then-format method works consistently across all programs.

Does subscript work in plain text emails?

No. Plain text emails do not support formatting of any kind. If you need subscript in an email, use a rich text or HTML email client (most modern email programs support this), or send a Word document or PDF instead.

What is the difference between subscript and superscript?

Subscript lowers text below the baseline (H₂O). Superscript raises text above the baseline (E=mc²). In Word and Excel, superscript uses Ctrl+Shift+Plus on Windows or Cmd+Shift+Plus on Mac. Google Docs uses Ctrl+Period on Windows or Cmd+Period on Mac.

Can I make subscript the default for a whole document?

No. Subscript is a character-level formatting choice, not a document-wide setting. You must apply it to each subscript section individually. If you use subscript frequently in a document, the keyboard shortcut is faster than the menu route.

Does subscript work in spreadsheet formulas?

Subscript formatting does not change how a formula calculates — it only changes how the text looks. If you type =2+2 and make the 2s subscript, the formula still works and returns 4. Subscript is purely visual.