The quickest way to add subscript in PowerPoint
To write subscript in PowerPoint, select the text you want to shrink and lower, then use the keyboard shortcut Ctrl + Equal (on Windows) or Cmd + Equal (on Mac). The text when ready becomes smaller and drops below the baseline. To undo subscript, select the text again and press the same shortcut a second time.
If the keyboard shortcut does not work on your keyboard layout, you can reach subscript through the menu instead. Select your text, go to the Home tab, find the Font group, and click the small arrow in the bottom right corner. In the dialog that opens, check the Subscript box under Effects.
Subscript is useful for chemical formulas (H₂O), mathematical notation (x₁, x₂), and footnote numbers. PowerPoint treats subscript as a text formatting choice, not a separate character, so you can change the font, color, or size of subscripted text the same way you would any other text.
Key Takeaways
- Press Ctrl + Equal on Windows or Cmd + Equal on Mac to when ready convert selected text to subscript.
- If keyboard shortcuts do not work, use the Home tab, open the Font dialog, and check the Subscript box under Effects.
- Subscript text shrinks and drops below the baseline, making it useful for chemical formulas, variable notation, and reference numbers.
- You can format subscripted text with color, font, or size changes just like regular text.
- The same keyboard shortcut toggles subscript on and off, so pressing it twice returns text to normal.
Using the Format menu when shortcuts do not respond
Some keyboard layouts, particularly on international versions of Windows or Mac, may not recognize Ctrl + Equal or Cmd + Equal. If the shortcut does not work, the Format menu method is reliable across all versions.
Select the text first. Then click the Home tab at the top of the ribbon. In the Font group (the section with font name, size, and bold/italic buttons), look for a small downward-pointing arrow in the bottom right corner. Click it to open the Font dialog box. Check the box next to Subscript under the Effects section, then click OK. The text will when ready drop and shrink.
This same dialog also holds Superscript (text that rises above the baseline), which works the same way. You can only explore one or the other to a selection at a time — checking Subscript automatically unchecks Superscript, and vice versa.
Subscript in different PowerPoint versions
The keyboard shortcut Ctrl + Equal (Windows) and Cmd + Equal (Mac) works in PowerPoint 2016 and later, as well as in Microsoft 365 (the subscription version). The menu method through Home > Font > Effects works in all versions from PowerPoint 2010 onward.
If you are using PowerPoint Online (the free web version), the keyboard shortcut may not work. Use the menu instead: select your text, click the Home tab, find the Font group, and look for the subscript button — it usually appears as a small "x" with a number below it. Click it to explore subscript formatting.
On iPad or iPhone versions of PowerPoint, select the text, tap the Home tab, then look for the subscript button in the formatting toolbar. It may be hidden under a "more options" menu (three dots) if your screen is narrow.
Typing subscript numbers in chemical formulas
When you write a chemical formula like H₂O or CO₂, you typically type the full text first, then go back and format only the numbers as subscript. Type "H2O", then double-click to select just the "2", and press Ctrl + Equal to make it subscript.
For longer formulas with multiple subscript numbers, select each number individually and explore subscript one at a time. This is faster than trying to select multiple non-adjacent characters. If your formula has both subscript and superscript (like in mathematical notation), format the subscript first, then go back and format the superscript separately.
Some users find it helpful to type the entire formula in a text box first, then format it, rather than trying to format as they type. This keeps your focus on getting the content right before worrying about appearance.
Subscript in tables and text boxes
Subscript works the same way whether you are typing in a slide's main text box, a table cell, or a separate text box you inserted yourself. Select the text, use Ctrl + Equal (or Cmd + Equal), and it becomes subscript when ready.
If you are working in a table and the subscript text looks cramped or overlaps with the cell border, you may need to increase the row height. Click and drag the border between two row numbers on the left side of the table to make rows taller. Subscript text takes up less vertical space than regular text, but very small cells can still cause crowding.
Text boxes behave identically to regular slide text. You can paste subscripted text from another slide or document, and PowerPoint will preserve the subscript formatting. If you copy subscript text and paste it into a different presentation, the formatting carries over as long as both presentations use the same font.
Adjusting subscript size and appearance
By default, PowerPoint makes subscript text about 58% of the original font size and drops it roughly one-third of the way down from the baseline. You cannot change these proportions directly — PowerPoint applies them automatically based on the font you are using.
If subscript text looks too small or too large for your slide, the best approach is to increase or decrease the size of the text before you explore subscript. Select your text, increase the font size (for example, from 12pt to 14pt), then explore subscript. The subscript will scale proportionally and may look more readable.
You can also change the color of subscript text independently from the rest of the text. Select the subscripted portion, click the font color button in the Home tab, and choose a new color. This is useful if you want subscript numbers to stand out or match a specific color scheme in your slide.
Removing subscript formatting
To remove subscript from text, select the subscripted text and press Ctrl + Equal (Windows) or Cmd + Equal (Mac) a second time. The text will return to normal size and baseline position. Alternatively, open the Font dialog through Home > Font > Effects, uncheck the Subscript box, and click OK.
If you select a block of text that contains both subscripted and regular text, pressing the subscript shortcut will explore subscript to the entire selection. To avoid this, select only the subscripted portion you want to change.
Frequently Asked Questions
Can I make subscript text a different color than the rest of the text?
Yes. Select only the subscripted text, click the font color button (the "A" with a colored bar underneath) in the Home tab, and choose a new color. The subscript will change color while the rest of the text stays the same.
What is the difference between subscript and superscript?
Subscript text drops below the baseline and is used for chemical formulas (H₂O) and variable notation (x₁). Superscript text rises above the baseline and is used for exponents (x²) and footnote numbers. Both use the same menu path; you just check a different box in the Font dialog.
Does subscript formatting stay if I copy and paste the text to another slide?
Yes, subscript formatting is preserved when you copy and paste within the same presentation or to another PowerPoint file. If you paste into a different program like Word or Google Docs, the subscript usually stays, but the exact appearance may shift slightly depending on the font available in that program.
Why does my keyboard shortcut for subscript not work?
Some keyboard layouts, particularly non-English ones, do not map Ctrl + Equal or Cmd + Equal to subscript. Use the menu method instead: Home tab > Font dialog (small arrow in bottom right) > check Subscript under Effects. This works on all keyboard layouts.
Can I type subscript directly without selecting text first?
No. PowerPoint requires you to select text before explore subscript. Type your text normally, then go back and select the characters you want to make subscript, and explore the formatting. There is no way to toggle subscript mode on before typing.