Text to Subscript

What is subscript text?

Subscript text is text that is set slightly below the baseline and at a smaller size than the surrounding characters. You see it most often in chemical formulas such as H₂O and CO₂, in mathematical notation such as xₙ and aᵢ, and in footnotes where a small lowered number references a citation. The lowered position and reduced size make subscripts visually distinct without taking up extra horizontal space, which is why they are the standard way to attach an index or count to a symbol.

Historically, subscripts were produced by typesetters using smaller physical type placed below the line. Today, most word processors and rich-text editors let you toggle subscript formatting with a keyboard shortcut, but that formatting only survives inside documents that support rich text. When you need subscript text in a plain-text environment — a social media post, a chat message, a code comment or a plain email — you need Unicode subscript characters, which is exactly what this tool produces.

Unicode subscript characters

Unicode includes a dedicated block of subscript characters that can be mixed into any text without special formatting. The digits 0–9 all have subscript equivalents (₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉), and a subset of lowercase Latin letters have them too: a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v and x. This tool maps every supported character to its subscript form and leaves unsupported characters (including capital letters and the remaining lowercase letters) untouched, so the result always reads correctly even when a perfect subscript does not exist.

Because these are real Unicode code points rather than formatting instructions, the output can be copied and pasted anywhere that accepts text — Twitter/X, Instagram, YouTube titles, Discord, plain-text emails, code editors and form fields. The appearance depends on the font in use: most modern system fonts render the subscript digits perfectly, while some of the rarer letter subscripts may fall back to a default glyph on older devices.

When to use subscript text

There are many practical situations where subscript text is useful. The most common ones include:

• Chemical formulas. Write H₂O, CO₂, NH₃ and C₆H₁₂O₆ in plain text without needing a chemistry editor or rich-text formatting.
• Mathematical notation. Represent sequences and indexed variables such as xₙ, aᵢ and vₜ in discussion forums, chat and documentation.
• Social media and chat. Add a subtle stylistic touch to usernames, captions and messages using small lowered characters.
• Footnotes and references. Mark inline references with lowered numbers when a full footnote system is not available.
• Physics and engineering units. Annotate variables such as Pₐ for atmospheric pressure or Tᵤ for upstream temperature in plain-text notes.

Wherever you need a lowered, smaller character in a plain-text context, subscript text is the cleanest solution.

How to convert text to subscript

Converting text to subscript with this tool takes only a second and happens entirely inside your browser. No upload, no sign-up, and no installation are required. Follow these three steps:

1. Paste or type your text. Click inside the input box on the left and either type directly or paste text from any source.
2. Read the live output. The result box on the right updates instantly on every keystroke, converting every supported letter and digit to its subscript form.
3. Copy the result. Click "Copy" to copy the subscript text to your clipboard, then paste it wherever you need it. Click "Clear" to start over.

Because every conversion is computed locally with JavaScript on your own device, your text never leaves your browser. This makes the tool completely private and suitable for confidential drafts and sensitive content.

Subscript vs superscript

Subscript and superscript are mirror images of each other: subscript sits below the baseline, superscript sits above it. Subscript is the convention for indices and counts (xₙ, H₂O), while superscript is the convention for exponents and powers (x², E=mc²). If you need raised characters instead of lowered ones, use the dedicated superscript converter. This subscript tool will only ever lower characters, so the two never get confused.

One practical caveat: not every lowercase letter has a subscript equivalent in Unicode, whereas the superscript set is slightly more complete. If a letter in your input has no subscript glyph, the tool leaves it in its normal position so the output remains readable. For chemistry and most mathematical notation, the supported letters are more than enough to write the formulas you need.