How to Write Subscript (H₂O and Formulas)
Write subscripts like H₂O for chemistry and math, using copy-paste Unicode.
When you need subscript
Subscript — small characters set below the baseline — is essential for chemistry (H₂O, CO₂), some maths notation and footnote markers. Most plain text fields have no subscript button, so Unicode subscript characters are the easy way to add them.
How to make it
Type your text or numbers into a subscript generator and copy the result. Supported digits and letters become subscript while unsupported characters stay normal — Unicode only defines subscript forms for a limited set, which covers the most common formula needs.
FAQ
Can I write H₂O with this?+
Yes — type the letters and the digit 2; the supported characters become subscript so you get H₂O.