上下標產生器
將文字轉換為下標（H₂O）或上標（x²）。一鍵複製貼上。
Compatibility
This tool replaces regular characters with Unicode subscript and superscript variants. The UI can be localized, but the actual conversion mainly works for digits, a limited set of Latin letters, and some math symbols.
- •Best for chemistry, math, physics, and indexing notation.
- •The surrounding sentence can be in any language, but only supported characters will change.
- •Ideal for copy-paste formulas in notes, chats, posts, and documents.
Popular Platforms
Best Use Cases
Chemistry
Use H₂O, CO₂, SO₄²⁻, and similar formulas.
Math notation
Write x², 10ⁿ, a₁, a₂, and r² quickly.
Study notes
Useful for formulas in school notes and learning materials.
使用方法
輸入文字
在輸入框中輸入文字，如 H2O、CO2、x2 + y2 = r2。
選擇並轉換
在輸出框中選擇要轉換的字元，然後點擊下標或上標按鈕。
複製貼上
點擊複製獲取轉換後的文字。貼上到任何地方 — 社群媒體、文件、郵件。
常見範例
H2O→H₂OCO2→CO₂x2 + y2 = r2→x² + y² = r²E = mc2→E = mc²a1, a2, a3→a₁, a₂, a₃10n→10ⁿ常見問題
這個工具免費嗎？
是的，完全免費，無需註冊。
輸出結果可以貼上到哪裡？
任何支援Unicode的地方 — 社群媒體、郵件、文件、即時通訊應用程式等。
為什麼有些字母沒有下標？
Unicode僅定義了有限的字母下標版本（a, e, h, i, j, k, l, m, n, o, p, r, s, t, u, v, x）。沒有下標對應的字母將保持不變。
Why can only some letters become subscript?
Unicode only defines subscript and superscript variants for a limited number of letters, so unsupported letters remain unchanged.
Does the page language affect the result?
No. The page language only changes the UI. Whether a character converts depends on whether Unicode has a matching variant.
What is this tool best for?
It is best for chemistry, math, physics, formulas, and sequence notation, not general text styling.