Superscript & Subscript Maker

Rewrites your input character-by-character using Unicode superscript and subscript codepoints. Works for digits, the four operators (+ - = ( )), and most Latin letters. The transformation is purely textual — no styling needed — so the result keeps working when copied into Slack, X, plain-text emails, code comments, or anywhere your typography stack doesn't follow.

Coverage is uneven, and the tool shows you exactly where it runs out. Superscript handles every digit and nearly the whole lowercase alphabet, but Unicode never assigned a superscript q, and the uppercase set skips C, F, Q, S, X, Y and Z. Subscript is far sparser: only a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v and x exist, with no uppercase at all. Anything without a codepoint is passed through unchanged and listed under the unsupported characters, so you can see what stayed literal rather than discovering it later in a published document.

Because these are separate codepoints rather than formatting, the result is not the same string as the original. A page search for x2 will not find x², and neither will a database query, a spreadsheet lookup or a regular expression written against the plain form. Unicode compatibility normalisation (NFKC or NFKD) folds them back to the base characters, which is why some systems silently undo the effect on save.

The characters also carry no semantic meaning. A screen reader announces H₂O in whatever way its character table dictates, often letter by letter, and search engines treat the glyphs as ordinary letters rather than as a chemical formula. For real mathematics or chemistry in a document that has markup available, <sup> and <sub> or a formula language remain the correct choice; this tool is for the places where no markup exists.