Turn plain text into Unicode subscript — chemical formulas (H₂O, CO₂), math indices (xᵢ, aₙ), and scientific variables. Formula mode converts H2O automatically. Copy and paste anywhere Unicode is supported.
Subscript text sits below the normal baseline — the 2 in H₂O, the i in xᵢ, or the 0 in v₀. Unicode defines lowered characters in the Subscripts and Superscripts block (U+2080–U+209F) and related phonetic extensions. These are independent code points, not font-size changes, so they survive copy-and-paste into plain-text environments.
That makes Unicode subscript essential for chemistry formulas in Discord messages, Instagram bios, WhatsApp chats, GitHub README files, and anywhere HTML <sub> tags or word-processor formatting is unavailable.
Subscript and superscript solve different problems. This tool lowers text for chemical formulas and math indices. The Superscript Generator raises text for exponents (x²), footnotes (note¹), and ion charges (Na⁺).
| Use case | Subscript (this tool) | Superscript |
|---|---|---|
| Water formula | H₂O ✓ | Wrong direction |
| Squared variable | Wrong direction | x² ✓ |
| Math index | xᵢ, aₙ ✓ | Different purpose |
| Ion charge | O²⁻ (partial) | Na⁺ ✓ |
| Default notation | Formula mode (H2O) | Caret notation (x^2) |
Chemistry is the #1 use case for subscript text. In printed textbooks, subscript numbers indicate atom counts in a molecule. Unicode subscript lets you reproduce that in plain text.
| Plain input | Unicode output | Compound |
|---|---|---|
| H2O | H₂O | Water |
| CO2 | CO₂ | Carbon dioxide |
| CH4 | CH₄ | Methane |
| NH3 | NH₃ | Ammonia |
| H2SO4 | H₂SO₄ | Sulfuric acid |
| C6H12O6 | C₆H₁₂O₆ | Glucose |
| NaCl | NaCl | No subscript needed |
Subscript indices label elements in sequences, vectors, and equations. Use underscore notation for precise control.
For exponents and powers (x²), use the Superscript Generator.
| You type | Output | When to use |
|---|---|---|
| H2O | H₂O | Formula mode (fastest) |
| H_2O | H₂O | Explicit underscore control |
| x_i | xᵢ | Math variable index |
| ref<12> | ref₁₂ | Multi-character subscript group |
| v_0 | v₀ | Initial value notation |
| Method | Plain-text paste | Best for |
|---|---|---|
| Unicode subscript (this tool) | Yes | Chat, bios, social media, code comments |
| Word / Docs subscript formatting | No — formatting lost on paste | Formal lab reports, academic papers |
| HTML <sub> tags | No — needs HTML renderer | Websites, rich-text editors |
| LaTeX H_2O | No — needs LaTeX renderer | Scientific publishing, PDF output |
Unicode subscript was encoded for specialized notations and legacy compatibility — not as a complete typesetting system. The Unicode Consortium treats subscript as higher-level markup in most cases. What exists today is unlikely to expand.
| Character set | Coverage | Impact |
|---|---|---|
| Digits 0–9 | 10/10 full | Chemistry formulas work reliably |
| Lowercase a–z | 17/26 partial | Missing b, c, d, f, g, q, w, y, z |
| Uppercase A–Z | 0/26 none | Element symbols stay uppercase (correct for chemistry) |
| Operators + − = ( ) | Yes | Math subscript expressions |
Discord & Telegram
H₂O and CO₂ render correctly in science channels, study groups, and gaming communities. Subscript digits are fully supported.
Instagram & TikTok
Chemistry formulas in bios and captions display on iOS and Android. Ideal for student and science-creator profiles.
WhatsApp & iMessage
Share formatted formulas in group chats without special apps. Digits ₀–₉ work consistently across mobile devices.
Google Docs & Word
Paste Unicode subscript directly. For graded lab reports, built-in subscript formatting may still be preferred.
GitHub & Notion
README files, issue comments, and study notes accept Unicode subscript in plain Markdown text fields.
X (Twitter) & Reddit
Science communication and r/chemistry-style posts benefit from inline H₂O and CO₂ without image attachments.
Common subscript characters for quick copy:
₂
Subscript 2 (U+2082)
₀
Subscript 0 (U+2080)
ᵢ
Subscript i (U+1D62)
ₙ
Subscript n (U+2099)
ₓ
Subscript x (U+2093)
₋
Subscript minus (U+208B)
A subscript generator converts standard text into lowered Unicode characters — text that sits below the baseline, like the 2 in H₂O or the i in xᵢ. Unlike formatting in Word or Google Docs, this tool outputs real Unicode code points you can copy and paste into plain-text fields on social media, messaging apps, and documents.
Use Formula mode (default): type H2O or CO2 and the tool automatically subscripts digits that follow letters — producing H₂O and CO₂. You can also type H_2O with underscore notation, or use angle brackets: H<2>O. All three methods work for chemistry formulas.
Superscript raises text above the baseline (x², note¹, Na⁺). Subscript lowers text below the baseline (H₂O, xᵢ, v₀). They solve opposite problems. Use our Superscript Generator for exponents and footnotes; use this Subscript Generator for chemical formulas, math indices, and scientific subscripts.
Small Text Generator offers multiple miniature styles — superscript, subscript, small caps — in one interface. This Subscript Generator is dedicated to lowered text with Formula mode (plain H2O input), underscore notation, a full Unicode character explorer, and chemistry-first templates. Choose this tool when subscript is your primary need.
Unicode encodes subscript characters for legacy and specialized notations — not as a complete alphabet. Only 17 of 26 lowercase letters have subscript forms (a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v, x). Missing: b, c, d, f, g, q, w, y, z. No uppercase subscript letters exist at all. Digits 0–9 have full coverage, which is why chemistry formulas work reliably.
Formula mode automatically subscripts digits that immediately follow letters. Type C6H12O6 and get C₆H₁₂O₆ without typing underscores. This mirrors how chemists write formulas in plain text and is the fastest way to format H₂O, CO₂, H₂SO₄, NH₃, and similar compounds.
Yes — paste Unicode subscript into Word and Google Docs and it displays correctly. For formal academic papers, built-in subscript formatting (Ctrl+= in Word, Format > Text > Subscript in Docs) may be preferred. Unicode subscript excels in plain-text contexts: chat apps, bios, code comments, and informal notes.
Yes. Subscript digits render reliably on Instagram, Discord, WhatsApp, TikTok, and Telegram. For chemistry (H₂O, CO₂), digit subscript is the main requirement and works everywhere. Subscript letters like xᵢ and aₙ also display on modern iOS and Android devices.
No — exponents require superscript (raised text), not subscript. Use our Superscript Generator for x², E=mc², and footnote markers. This tool is for lowered text: chemical formulas, math indices, and scientific variables.
Yes — searching for H2O will not find H₂O because the subscript 2 is a different Unicode code point (U+2082). This is a known limitation of Unicode subscript in plain text. For searchable documents, use proper formatting tools. For visual display in bios and chat, Unicode subscript works well.
Screen readers announce subscript characters by their Unicode names (for example, subscript two) rather than as styled normal letters. Use subscript for short decorative or scientific snippets — not for essential body content that must be fully accessible.
Yes. Modern mobile browsers and apps support Unicode subscript digits and the available subscript letters. H₂O, CO₂, and x₁ display correctly on iOS and Android in Safari, Chrome, Instagram, Discord, and WhatsApp.
Three methods: (1) Formula mode — plain H2O auto-converts to H₂O; (2) Underscore — x_i becomes xᵢ, v_0 becomes v₀; (3) Angle brackets — ref<12> becomes ref₁₂. Combine modes using the selective subscript panel above the style tabs.
Yes. This subscript generator is 100% free, requires no sign-up, and runs entirely in your browser. Your text is never uploaded to a server.
