Why are some letters (b, c, d, f, g, q, w, y, z) missing from Unicode subscript?

The Unicode Consortium only encoded subscript characters that historically existed in phonetic alphabets (like the Uralic Phonetic Alphabet) and mathematical standards. As a result, Unicode includes all 10 digits (₀–₉) and 17 Latin letters (ₐ ₑ ₕ ᵢ ⱼ ₖ ₗ ₘ ₙ ₒ ₚ ᵣ ₛ ₜ ᵤ ᵥ ₓ), but has no dedicated code points for b, c, d, f, g, q, w, y, or z. To format those letters as subscript on websites, select our 'HTML Tag' mode.

How do I type H₂O or CO₂ without turning the H, C, and O into subscript?

Select 'Smart Chemical & Math Formula Mode' in the settings panel (or uncheck 'Convert letters'). When you type H2O, CO2, or C6H12O6, only the numbers are converted into subscript (H₂O, CO₂, C₆H₁₂O₆).

Can I convert subscript characters back to normal text?

Yes! Select 'Subscript → Normal Text (Decode)' in the Conversion Mode panel (or click 'Swap Input ↔ Output') to convert H₂SO₄ or x₁₊₂ back into standard plain text.

Subscript Generator Online – Convert Text to Subscript

Instantly convert numbers (₀₁₂₃₄₅₆₇₈₉), letters (ₐₑₕᵢⱼₖₗₘₙₒₚᵣₛₜᵤᵥₓ), Greek symbols (ᵦᵧᵨᵩᵪ), and operators (₊₋₌₍₎) into copy-and-paste Unicode subscript text or HTML <sub> tags. Includes a Smart Chemical & Math Formula Mode that automatically formats H2SO4 → H₂SO₄ and x_1 → x₁ without altering main letters!

Source Text / Formula

caracteres: 0

Palavras: 0

Subscripts: 0

Subscript Result

Click-to-Copy Unicode Subscript Palette

Complete Unicode Subscript Reference Table

Unlike HTML <sub> styling, Unicode subscript characters are real plain-text symbols that can be copied and pasted directly into Instagram bios, X/Twitter posts, Discord messages, YouTube comments, email subject lines, and spreadsheets:

Categoria	Normal Characters	Unicode Subscript	Unicode Code Points
Digits (0–9)	`0 1 2 3 4 5 6 7 8 9`	`₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉`	`U+2080` – `U+2089`
Math Operators	`+ - = ( )`	`₊ ₋ ₌ ₍ ₎`	`U+208A` – `U+208E`
Latin Letters (17 + Schwa)	`a e h i j k l m n o p r s t u v x ə`	`ₐ ₑ ₕ ᵢ ⱼ ₖ ₗ ₘ ₙ ₒ ₚ ᵣ ₛ ₜ ᵤ ᵥ ₓ ₔ`	`U+2090` – `U+209C`, `U+1D62` – `U+1D65`, `U+2C7C`
Greek Letters (5)	`β γ ρ φ χ`	`ᵦ ᵧ ᵨ ᵩ ᵪ`	`U+1D66` – `U+1D6A`

Why Are 9 Letters (b, c, d, f, g, q, w, y, z) Missing From Unicode Subscript?

A common question among students and developers is why typing the full alphabet a–z into a Unicode subscript converter leaves 9 letters (b, c, d, f, g, q, w, y, z) unchanged. When the Unicode Consortium created the Superscripts and Subscripts block, they only included characters that already existed in legacy phonetic transcription systems (such as the Indo-European and Uralic Phonetic Alphabets) and mathematical standards. Because rich-text markup like HTML <sub> and LaTeX _ was expected to handle general typography, the remaining 9 letters were never assigned dedicated Unicode code points.

Tip: Whenever you need a complete A–Z subscript word for a website, blog, or Markdown document, switch the Conversion Mode above to HTML <sub> Tags!

Popular Chemical & Mathematical Subscript Examples

Water: H₂O | Carbon Dioxide: CO₂ | Sulfuric Acid: H₂SO₄
Glucose: C₆H₁₂O₆ | Methane: CH₄ | Calcium Hydroxide: Ca(OH)₂
Sequence & Vector Notation: x₁, x₂, ..., xₙ | Recurrence Relation: aᵢ₊₁ = aᵢ + v₀t
Logarithm Base & Physics Constants: log₂(x), log₁₀(n), vₘₐₓ, Fₙₑₜ

Perguntas frequentes

How do I format chemical formulas like H2SO4 or C6H12O6 automatically?

Select Smart Formula Mode (H2O → H₂O, x_1 → x₁) in the settings panel. In this mode, element symbols like H, S, O, and C stay normal uppercase letters while numbers following them are automatically converted into Unicode subscripts (H₂SO₄, C₆H₁₂O₆).

How can I write mathematical subscripts like x_i or a_{n+1}?

In Smart Formula Mode, you can use LaTeX-style underscores! Type x_i to get xᵢ, or wrap multi-character subscripts in curly braces like a_{n+1} to get aₙ₊₁.

What are the keyboard shortcuts for subscript in Word and Google Docs?

In Microsoft Word, press Ctrl + = (Windows) or Cmd + = (Mac). In Google Docs, press Ctrl + , (Windows) or Cmd + , (Mac). For apps that don't support rich-text shortcuts (like social media bios, Discord, or plain text), copy and paste the Unicode characters generated by this tool.