Subscript Generator

Water is the test. H₂O puts the 2 below the baseline. The superscript generator does the opposite and will give you H²O, which is a different notation. Use this page when the number belongs underneath. Digits-only mode does not try to lower H or O, so the missing list stays empty. That empty list means “nothing we attempted failed”, not “every character changed”.

Which letters exist. Unicode defines subscripts for a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v and x, plus the digits and a few signs. It does not define them for b, c, d, f, g, q, w, y, z or for capitals. Letters-and-digits mode copies those unchanged and lists them. “note” happens to be four letters that all exist, so the missing list says none and the whole word drops. A word with a b in it will keep the b.

Not a chemistry checker. The page will lower any digits you type. It will not tell you that carbon dioxide is CO₂ or that a charge belongs as a superscript. You choose the mode. On a site you control, the HTML sub element is better, because the underlying text stays “H2O” for search and for a screen reader that does not know the subscript digit. Use this generator when the destination stores one string and has no sub button.

Fonts. Subscript digits live in the Superscripts and Subscripts block and are widely drawn. Subscript letters live there too and are more often missing, especially on a minimal Linux font. If the digit itself is a box, copy the original and use a font that covers the block, or write H2O in plain characters. The note under the result is that warning. The small text generator raises a whole line instead. It is the wrong tool for a formula that must keep full-size letters.

Limits. 280 characters. No stacked fractions, no ionic charges placed automatically, no alignment. One line in, one lowered line out.

Signs. Plus, minus, equals and parentheses have subscript forms, and letters-and-digits mode will lower them. Digits-only mode leaves the signs on the baseline, which is what you want next to H₂O and the wrong choice if an entire expression should sit low. Switch mode instead of editing the lowered line by hand. A sign that survives as itself in digits-only mode is not listed as missing.

Water, digits only

Inputs: Text: H2O | Mode: digits

Type H2O and set the mode to digits. The 2 drops and the letters stay full size.

Result: Mode: digits Lowered: H₂O No subscript form: none Digits have subscripts in most fonts. Many letters do not. A box means the font lacks even the digit form.

The lowered line is H₂O.

A word whose letters all exist

Inputs: Text: note | Mode: all

Type note and set the mode to all. n, o, t and e each have a subscript, so the missing list is empty.

Result: Mode: all Lowered: ₙₒₜₑ No subscript form: none Digits have subscripts in most fonts. Many letters do not. A box means the font lacks even the digit form.

Why is the water example H₂O and not H²O?

The 2 in H₂O sits below the line. A raised 2 is a different character and a different meaning. This page only lowers.

Which letters have no subscript?

b, c, d, f, g, q, w, y, z and the capitals, among others. They stay as typed and are named.

Does digits-only mode call letters missing?

No. It did not try to lower them. The missing line lists only characters the mode tried and could not map.

Why might a subscript show as a box?

The font has no glyph. Digit subscripts are common. Letter subscripts are less common. The character is still in the string.

Can it balance an equation?

No. It lowers characters. It does not know chemistry.

Is the formula uploaded?

No. The substitution runs in the browser.