The Short Version
There are three main ways to get superscript or subscript characters into a Word document. Keyboard shortcuts are fastest for quick work. The ribbon buttons are fine when you need more control. Field codes and Equation Editor handle the technical stuff. Select the characters you want to format. Press Ctrl + Shift + Plus sign (+) for superscript. Press Ctrl + = for subscript. Press either shortcut again to turn it off. That is the baseline method and it works for 90 percent of everyday use cases. I spent years doing this manually in financial models where every exponent matters. One time I had a 400-page lease agreement with subscripts scattered through chemical compound formulas and mathematical variables mixed together. The Find and Replace dialog with special character codes saved me three hours. You open Find and Replace, click More, check Use Wildcards, and then search using the actual character codes if you know them. This was before I started using wildcards properly. Now I just run a macro to find and replace common patterns across the whole document.
The keyboard shortcuts have a quirk most people do not know. When you press Ctrl + = and start typing, Word does not always apply subscript to already selected text if that text contains different fonts or formatting. If you have mixed formatting in a selection, deselect first, then apply the shortcut, then reselect everything you want converted. It is a minor thing that trips people up constantly.
Using The Ribbon Interface
Go to the Home tab. Look at the Font group. You will see two small icons: one with an X² for superscript and one with an X for subscript. Click the one you need after selecting your text. This is the most visible method but honestly it is slower than shortcuts once you have memorized the keys. Here is something nobody mentions. The ribbon button opens a full Character dialog box if you hold Shift while clicking it. From there you can set exact point sizes for both superscript and subscript rather than accepting Word's default scaling. Default superscript is usually 55 percent of the base font size by default. If you are doing scientific work where those proportions need to be consistent across templates, locking this value in the dialog box prevents different documents from looking wildly different when they are merged together later.
Get the Full Details
Advanced Methods
For equations and scientific notation, neither shortcut nor ribbon buttons give you what you need. Word has a built-in Equation Editor that handles subscript and superscript properly for math and chemistry. Press Alt + = to insert an equation field. From there you can type things like H2O or E = mc² using the proper mathematical notation tools. The rendering is completely different from regular text formatting. This matters because superscript text characters and equation field characters behave differently when copied to other applications. If you paste Word superscript text into PowerPoint or into a PDF converter, the formatting sometimes collapses. Equation fields survive that transfer better in my experience. Another approach is using field codes directly. Press Ctrl + F9 to insert a pair of field braces, then type something like EQ \sup(2). This is old-school and unnecessary for most people, but it gives you precise control over positioning that the normal methods do not. I used this technique when working with legal documents where court formatting requirements demanded exact vertical placement of footnote references.
Common Problems And What Actually Works
The biggest issue with superscript and subscript in Word is that auto-correct sometimes interferes. Word will automatically convert certain character sequences. If you type H2O it may convert the 2 into subscript without asking. If you do not want that behavior, go to File > Options > Proofing > AutoCorrect Options and uncheck the relevant items. I turned this off entirely because I was frustrated by accidental conversions in technical documents where H2 meant hydrogen count and not water. Another problem is template inheritance. When you create a new document from a template that has custom superscript and subscript styles defined, those definitions override your defaults. You might think you are applying superscript but the resulting appearance is completely different because the template changed the font size scaling or the baseline offset. Always check the underlying style definition if the formatting looks wrong after opening a new file. Paste from other sources is unreliable. Copy superscript text from a webpage or another application and paste it into Word and the formatting may be lost entirely. Some browsers and PDF readers strip sub and sup tags during copy operations. The workaround is to paste into Notepad first to strip all formatting, then reapply superscript or subscript in Word. It adds steps but it prevents half the headaches.
When Superscript And Subscript Formatting Fails Completely
Word's superscript and subscript are character-level formatting, not true typographic positioning. This means they do not behave like LaTeX or proper DTP software when it comes to spacing and line wrapping. If you have a long string of superscript characters in the middle of a paragraph, Word sometimes wraps the line awkwardly because it does not account for the reduced font size of the superscript when calculating line breaks. The superscript characters may stick out past the margin or cause the next line to shift unexpectedly. For serious technical publishing where these issues matter, you should consider exporting to a format that handles positioning natively or using a dedicated typesetting tool. Word is adequate for most business and academic writing but it is not designed for high-precision typography.
