Subscript Generator
Use the CaseSwitch Subscript Generator for Unicode subscripts in simple formulas like H₂O when rich text is unavailable. Type a short token, preview which letters map, and copy. Conversion stays in this browser.
Written by the CaseSwitch editorial team. We maintain these tools in the browser so drafts, keys, and images stay on your device.
Last reviewed: 23 July 2026
Processed locally in your browser. Nothing is sent to a server.
Paste or type text to convert. Output stays empty until there is input.
Character count: 0 · Word count: 0 · Line count: 0
Examples
Water formula
Input
H2O
Output
H₂O
Carbon dioxide
Input
CO2
Output
CO₂
x sub 2
Input
x2
Output
ₓ₂
Partial hello
Input
Hello
Output
Hₑₗₗₒ
Brand mixed
Input
CaseSwitch
Output
CₐₛₑSwᵢₜcₕ
Hi index
Input
Hi
Output
Hᵢ
How to use
- Type the formula fragment (keep it short).
- Check which letters stayed full-size in the preview.
- Copy only if the critical indices converted; otherwise rewrite with digits only.
What this tool is for
Subscript Generator lowers digits and a limited set of Latin letters into Unicode subscript forms for chemistry-style notes, footnote-ish markers, and plain-text formulas. Coverage is incomplete — many consonants have no subscript twin — so it is a helper for simple formulas, not a full chemical typesetter.
How it works
Digits 0–9 map to ₀–₉. Letters in the supported set (roughly a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v, x) become subscript lookalikes; unsupported letters stay full size. That partial map is why “Hello” becomes a mix like Hₑₗₗₒ while “ABC” may stay unchanged.
When to use it
Quick H₂O / CO₂ style captions, simple variable indices in a chat that lacks LaTeX, and labeling a short footnote marker when markdown is stripped.
When not to use it
Do not write full chemistry papers, patent claims, or academic submissions in Unicode subscripts. Prefer LaTeX, MathML, or a real equation editor when accuracy matters.
How it compares to related tools
Superscript Generator raises characters for exponents and ordinals. Small Text shrinks for aesthetics, not semantic subscript. Unicode Text Converter can switch presets when you are exploring notation looks.
Common mistakes
Expecting every letter to subscript, pasting mixed half-converted formulas into grading portals, using subscript as tiny aesthetic text for bios, and assuming screen readers announce H₂O as “H two O.”
Chemistry coverage limits
Unicode provides a convenience subset, not IUPAC completeness. Missing subscript letters break longer compound names — fall back to plain H2O ASCII or a real formula renderer.
Semantics vs appearance
True subscript in HTML (<sub>) carries clearer structure for assistive tech. Unicode subscripts are ambiguous characters that may be read letter-by-letter.
Frequently asked questions
Why didn’t B become subscript?+
Unicode simply has no subscript B in the common set. Stick to supported letters and digits.
Is this a chemistry font?+
No. It maps to Unicode subscript code points — not a specialized chem font install.
Will teachers accept Unicode formulas?+
Often no. Use the format your course requires (LaTeX, handwritten, etc.).
Subscript vs small text?+
Subscript is for indices/formulas; small text is decorative petite letters.
Uploaded?+
No. Subscript mapping runs in your browser.
Can I flatten subscripts later?+
Unicode to Text Converter helps for some forms; verify digits manually.
Is my phrase uploaded for styling?+
No. Unicode letter mapping for this generator runs in your browser. We do not store bios or captions you type here.
Will styled text look the same everywhere?+
Unicode decorative characters render differently across platforms, apps, and screen readers. Use styled text for display purposes and keep plain text for accessibility-critical content.
Related tools
Superscript Generator
Caption math like x², casual ordinals (1ˢᵗ style when letters map), footnote stars in plain bios, and chat notes when LaTeX is unavailable.
Small Text Generator
Squeezing a secondary bio line, a subtle Discord status, a compact caption tag, and pairing a plain @handle with a small-styled descriptor.
Unicode Text Converter
Side-by-side taste tests for a bio word, creators who hop between bold and script, and users who want one bookmark before reading platform-specific limit pages.