Subscript Generator
Convert numbers, symbols and letters to Unicode subscript, so H2O becomes H₂O in posts, chats and documents that strip formatting.
Your text
Subscript text
How to use the Subscript Generator
Type your text or formula. By default the tool converts numbers and symbols only, so H2O becomes H₂O and CO2 becomes CO₂ while the element letters stay full size. Switch to "Letters, numbers and symbols" to convert letters too. Letters without a subscript form stay as they are, and the tool tells you how many.
Why Unicode subscripts help
Chemistry, maths and science writing rely on subscripts. The HTML <sub> tag is stripped by most chat apps, social platforms and email subject lines. Unicode subscript characters are real text, so they keep their shape when you copy and paste them.
Common use cases
- Chemical formulas: H₂O, CO₂, NH₃, C₆H₁₂O₆
- Maths indices: aₙ, xᵢ, log₁₀
- Science posts and teaching materials
- Lab reports and technical newsletters
Frequently asked questions
Why are some letters not converting?
Unicode only has subscript forms for a limited set of letters: a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v and x. Other letters, and all capitals, have no subscript version.
Will the formula display in Excel?
Yes. Excel treats Unicode subscripts as normal text characters, so the formula displays correctly. They are not numbers, though, so they will not work in calculations.
Can screen readers handle subscript characters?
Support varies. Some screen readers announce them clearly and others skip or misread them. For documents where accessibility matters, use real <sub> formatting instead.