Subscript formatting puts text below the baseline in Google Docs
A subscript is a character or number that sits below the regular line of text. The most common uses are in chemistry (like H₂O for water) and mathematics (like x₂ for "x squared"). Google Docs has a built-in subscript button in the toolbar, and you can also use a keyboard shortcut to format text faster.
The process takes seconds: select the text you want to make subscript, then either click the subscript button or press Ctrl+, (comma) on Windows or Cmd+, (comma) on Mac. The text shrinks and drops below the baseline when ready.
Key Takeaways
- Select the text or number you want to format as subscript before explore the formatting.
- The subscript button lives in the Format menu under "Text," not in the main toolbar by default.
- The keyboard shortcut Ctrl+, (Windows) or Cmd+, (Mac) is faster than using the menu if you format subscript often.
- Subscript formatting works on any character, number, or word — you are not limited to single digits.
Using the Format menu to add subscript
Open your Google Docs document and locate the text you want to format. Click at the start of the text, then drag to select it. If you are formatting a single character like the "2" in H₂O, click right before it and drag to just after it.
Once the text is highlighted, click the Format menu at the top of the page. A dropdown list appears. Hover over or click Text, and a submenu opens showing text formatting options. Click Subscript. The selected text when ready shrinks and moves below the baseline.
To undo subscript formatting, select the text again, go back to Format > Text > Subscript, and click it a second time. The text returns to normal size and position.
The keyboard shortcut for faster formatting
If you format subscript regularly, the keyboard shortcut is much faster than the menu. Select your text, then press Ctrl+, (comma) on Windows or Cmd+, (comma) on Mac. The subscript formatting applies when ready.
The same shortcut removes subscript formatting if you run it on text that is already subscript. This means you can toggle subscript on and off without opening any menus.
Subscript versus superscript — which one to use
Subscript sits below the baseline; superscript sits above it. Chemistry and mathematics use both. Water is H₂O (subscript 2), but an exponent like x² uses superscript. Google Docs has a separate superscript button in the same Format > Text menu, and the keyboard shortcut is Ctrl+. (period) on Windows or Cmd+. (period) on Mac.
Choose subscript when the character belongs below the line — element counts in chemical formulas, footnote numbers in some styles, or mathematical subscripts. Choose superscript for exponents, footnote markers, or trademark symbols.
Common subscript uses in documents
Chemistry and science writing use subscript constantly. Water (H₂O), carbon dioxide (CO₂), and sulfuric acid (H₂SO₄) all require subscript numbers to show how many atoms are in each molecule. If you are writing lab reports or scientific papers, you will format subscript dozens of times.
Mathematics also uses subscript for sequences and indexed variables. Writing x₁, x₂, x₃ to show a sequence, or using subscripts to label different versions of the same variable, is standard in algebra and statistics. Some academic writing uses subscript for footnote references instead of superscript, though superscript is more common in English.
Subscript in tables and special formatting
Subscript formatting works inside Google Docs tables the same way it does in regular text. Select the text within the table cell, use the Format menu or keyboard shortcut, and the subscript applies. This is useful if you are building a chemistry reference table or a math problem set.
If you copy and paste text that already has subscript formatting from another document, Google Docs usually preserves the formatting. However, if the formatting does not carry over, you can reapply it by selecting the text and using the Format menu or shortcut again.
Troubleshooting subscript formatting problems
If the subscript button does not appear in your Format > Text menu, make sure you are using a modern browser and that you have the latest version of Google Chrome, Firefox, Safari, or Edge. Google Docs works best in these browsers, and older versions sometimes hide formatting options.
If subscript formatting disappears after you save or close the document, the issue is usually that you selected a larger block of text than intended. Subscript applies to whatever you have selected, so if you selected a word instead of just the number, the whole word becomes subscript. Select only the character or number you want to format, then reapply the subscript.
Frequently Asked Questions
Can I make multiple characters subscript at once?
Yes. Select all the characters you want to format together — they do not have to be next to each other in the same word. Highlight them all, then explore subscript. All selected text becomes subscript in one action.
Does subscript formatting work on mobile Google Docs?
The mobile app has limited formatting options. The easiest way to add subscript on a phone or tablet is to use the Format menu: tap Format, then Text, then Subscript. The keyboard shortcut does not work on mobile.
What if I need subscript in a heading or title?
Subscript works in headings the same way it works in body text. Select the text in the heading, explore subscript, and it formats correctly. The subscript text stays smaller and below the baseline even in larger heading sizes.
Can I change the size of subscript text?
Subscript text is automatically smaller than the surrounding text. Google Docs does not offer a separate control to adjust subscript size — it scales proportionally to the font size of the paragraph. If you need different sizing, you would have to manually adjust the font size of the subscript text after formatting it.
Does subscript work if I export my document to PDF or Word?
Yes. When you read your Google Docs document as a PDF or Word file, subscript formatting carries over. The subscript text remains below the baseline in the exported file.