Subscript Generator
Lower whole text, the numbers in formulas like H2O, or indices like x_1.
This tool leaves y, g and d full size because they are not in its broadly supported subscript map.
Single characters
Tap to copy a single character.
How subscript works
Subscript characters sit below the baseline: the ₂ in H₂O, the ₁ in x₁. Unicode includes subscript digits, several signs and a partial set of letters used in technical notation and phonetic transcription. They can be useful in plain-text fields that have no subscript formatting.
The modes do the tedious part for you. Whole text lowers everything it can. Chemistry scans a formula and lowers only the numbers that follow an element or a closing bracket, so C6H12O6 becomes C₆H₁₂O₆ and Ca(OH)2 becomes Ca(OH)₂; a charge written after a caret, like SO4^2-, is raised instead. Indices lowers whatever follows an underscore, the notation used in LaTeX and many programming docs.
This tool uses a conservative subscript map of 17 widely supported Latin letters, so many words cannot be fully lowered. Newer Unicode versions add a few more subscript letters, but support is less consistent. Any character left full size is listed under the result.
Frequently asked questions
How do I write H₂O?
Choose the Chemistry mode and type the formula normally — H2O, CO2, Ca(OH)2. Numbers that follow a letter or closing bracket are lowered automatically; charges written after a caret, like SO4^2-, are raised.
Which letters exist in subscript?
Only a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v and x, plus all digits and + − = ( ). Other letters, like b, c, d and g, stay full size, and the tool lists them.
How do I type an index like x₁?
Use the Indices mode and put an underscore before the index: x_1 becomes x₁. Group longer indices in braces, as in a_{ij}.
Do subscript characters display everywhere?
Digits and the older subscript letters are widely supported. Newer subscript characters can still depend on the device’s installed fonts, so the tool keeps to a conservative set.