Subscript generator — lowered numbers for formulas in plain text

How to use the subscript generator

1. Type or paste a formula or index into Your text. The sample is “H2O, CO2 and C6H12O6”.
2. Check Styled text: digits and supported lowercase letters sit lower; capitals and other characters stay as typed.
3. Press Copy to copy the whole result, or select just the part you need.

What it does and when to use it

Chemists, students and teachers often need H₂O or CO₂ in a message, a slide note or a forum post where there is no subscript button. Maths and programming notes use subscripts for indices such as x₁ and aₙ. This tool turns typed digits and letters into ready-made lowered characters.

Since capitals never change, full formulas convert well in one go: C6H12O6 becomes C₆H₁₂O₆. To check a formula’s mass or balance a reaction, use the molar mass calculator or the equation balancer, then paste their formulas here for display.

How it works

The tool looks up each character in a fixed table and swaps it if a lowered form exists:

Anything else, including all capitals, spaces and commas, is copied unchanged. Because the letters come from different blocks, a font may draw them at slightly different sizes.

Worked examples

From the tool’s own function:

• CO2 + H2O → CO₂ ₊ H₂O. The formulas are right, but the plus has dropped too. Convert CO2 and H2O on their own, then join them with a normal +.
• x1, x2 ... xn → ₓ₁, ₓ₂ ... ₓₙ. Here the letter x is lowered as well. If you want a full-size x with a lowered index, convert only the digits or n.
• bad → bₐd. Only the a has a subscript form, which shows why whole words rarely work.

Limits and tips

• Not for long text. With nine lowercase letters missing, most words come out half-lowered.
• Accessibility. Screen readers often read ₂ as “subscript two” or skip it, and search engines may not match H₂O to H2O. In documents and web pages, use real subscript formatting so the meaning is kept.
• The work is done in your browser; nothing is uploaded.