Subscript is a smaller character positioned below the baseline of regular text
Subscript is text that sits lower than the line your regular letters sit on. The most common example is the "2" in H₂O — the subscript 2 tells you there are two hydrogen atoms. In chemistry, biology, and mathematics, subscript appears constantly because it conveys meaning that would take extra words to explain otherwise.
When you type subscript in a document editor, you are not creating a separate character — you are formatting an existing character to appear smaller and lower. The character itself stays in your document as normal text; only its visual position changes. This matters for privacy because subscript formatting is stored as formatting data, not as a special symbol, so it travels with your document the same way bold or italics do.
You will encounter subscript most often in scientific writing, chemical formulas, mathematical notation, and footnote references. Some document editors also use subscript for automatic footnote numbering — when you insert a footnote, the editor may place a tiny superscript number in your text and a matching subscript number at the bottom of the page.
Superscript is the opposite: a smaller character positioned above the baseline
Superscript sits higher than regular text. The most familiar example is the "2" in x² (x squared) or the "st" in 21st. Like subscript, superscript is a formatting choice applied to an existing character, not a separate symbol.
Superscript appears in exponents, ordinal numbers (1st, 2nd, 3rd), footnote markers, trademark symbols (™), and copyright notices (©). In academic writing, superscript numbers often mark citations — a sentence ending with a superscript 1 points the reader to reference 1 at the end of the document or bottom of the page.
The formatting data for superscript behaves the same way as subscript: it stays embedded in your document and moves with the text if you edit or share the file.
Key Takeaways
- Subscript places text below the baseline (like the 2 in H₂O), while superscript places it above (like the 2 in x²).
- Both are formatting applied to regular characters, not special symbols, so they remain part of your document's text layer.
- Subscript and superscript formatting data is stored in your document file the same way bold or italics are stored.
- Most document editors include subscript and superscript buttons in the toolbar or under a Format menu, and most support keyboard shortcuts for quick access.
How to add subscript or superscript in common editors
In Google Docs, select the character or number you want to format, then go to Format > Text > Subscript or Superscript. You can also use the keyboard shortcut Ctrl+, (comma) for subscript on Windows or Cmd+, on Mac, and Ctrl+. (period) for superscript on Windows or Cmd+. on Mac.
In Microsoft Word, select the text, then go to Home > Subscript or Superscript in the toolbar. The keyboard shortcut is Ctrl+= for subscript and Ctrl+Shift+= for superscript on Windows. On Mac, use Cmd+= for subscript and Cmd+Shift+= for superscript.
In LibreOffice Writer (the free, open-source alternative), select the text and go to Format > Text > Subscript or Superscript. The keyboard shortcut is Ctrl+Shift+B for subscript and Ctrl+Shift+P for superscript on both Windows and Mac.
In Apple Pages, select the text, then go to Format > Text > Baseline > Subscript or Superscript. There is no built-in keyboard shortcut, but you can create one in System Settings if you use these features often.
Why subscript and superscript matter for document privacy
When you share a document that contains subscript or superscript, that formatting information travels with the file. If you share a Word document, a Google Doc, or a PDF, anyone who opens it can see exactly where you used subscript or superscript and what characters you formatted that way. This is rarely a privacy concern on its own — subscript in a chemistry formula does not reveal personal information — but it does mean your document contains more data than just the visible words.
If you are concerned about what metadata your document carries, subscript and superscript formatting is part of that metadata. Some document editors allow you to strip formatting or convert a document to plain text before sharing, which would remove subscript and superscript along with bold, italics, and other visual styling. Others let you export to PDF, which locks the formatting in place and prevents further editing but also prevents someone from easily extracting or modifying the underlying text.
When you might not need subscript or superscript
If you are writing for the web or for a platform that does not support rich formatting — like plain email or a text message — you can approximate subscript and superscript using other methods. For chemical formulas, you might write H2O instead of H₂O. For exponents, you might write x^2 instead of x². For ordinal numbers, you might write 21st without the superscript formatting. These workarounds are less visually polished but they communicate the same information and reduce the amount of formatting data in your document.
Some organizations have style guides that discourage subscript and superscript in certain contexts. Academic journals, for example, may ask you to use plain text notation in the manuscript stage and only explore subscript or superscript during the final typesetting process. If you are writing for a specific publication or organization, check their guidelines before spending time formatting.
Subscript and superscript in PDFs and exported documents
When you export a document to PDF, subscript and superscript are preserved as visual formatting but are no longer editable. The PDF viewer sees the text in its formatted position, but the underlying text data may or may not preserve the subscript or superscript information — it depends on how the PDF was created. Some PDFs store subscript as actual subscript data; others store it as a smaller character positioned lower, which looks the same but is technically different.
If you convert a document to plain text (a .txt file), all subscript and superscript formatting is lost. The characters remain, but they appear at the baseline like regular text. This is useful if you want to remove all formatting data before sharing, but it means the document loses its visual structure.
Frequently Asked Questions
Can I copy subscript or superscript from one document to another?
Yes. If you copy text that includes subscript or superscript formatting from one document and paste it into another document in the same editor (or a compatible one), the formatting usually comes along. If you paste into a different type of editor or into plain text, the formatting may be lost. To be safe, paste as plain text first, then reapply the subscript or superscript formatting in the new document.
Does subscript or superscript affect how a screen reader reads my document?
Most screen readers treat subscript and superscript as regular text and read them in sequence with the rest of the document. The visual positioning does not change how the words are spoken. If accessibility is important for your document, test it with a screen reader or ask someone who uses one to review it.
What if my document editor does not have a subscript or superscript button?
Check the Format menu or Text menu — the button may be there but not visible in the default toolbar. You can also try the keyboard shortcut for your editor. If neither works, your editor may not support subscript or superscript, in which case you can use the plain-text workarounds (H2O, x^2) or switch to an editor that does support them.
Is subscript the same as a footnote?
No. Subscript is a formatting style that makes text smaller and lower. A footnote is a reference system that links a number or symbol in your text to a note at the bottom of the page or end of the document. Some editors use superscript numbers as the visual marker for footnotes, but the footnote itself is a separate feature. You can have subscript without footnotes, and footnotes without subscript.