Subscript and superscript

Subscript and superscript marks round-trip between DOCX and Tiptap. Content like H₂O imports, renders in the editor, and exports back to DOCX with formatting preserved.

What you need

• Extensions: ConvertKit — Subscript and Superscript are bundled and enabled by default.
• Configuration: None required beyond registering ConvertKit.

Support overview

Import

Import subscript and superscript using the editor extension or the REST API. Both produce identical output.

The conversion service reads <w:vertAlign> run properties and produces the corresponding marks:

Chemical formulas (H₂O, CO₂), mathematical notation (x², E=mc²), and footnote references all import correctly.

Editor rendering

ConvertKit bundles both Subscript and Superscript and enables them by default — no separate install required.

import { ConvertKit } from '@tiptap-pro/extension-convert-kit'

const editor = new Editor({
  extensions: [ConvertKit],
})

Subscript renders as <sub>, superscript renders as <sup>. Keyboard shortcuts: Cmd+, for subscript, Cmd+. for superscript.

If you don't want one of them, disable it through ConvertKit's configuration:

ConvertKit.configure({
  subscript: false,   // disable subscript
  superscript: false, // disable superscript
})

Export

Both the editor extension and the REST API export subscript and superscript marks back to DOCX run properties:

Chemical formulas (H₂O, CO₂), mathematical notation (x², E=mc²), and footnote references all round-trip without loss.

Subscript and superscript within math or LaTeX expressions follow a separate code path (using OOXML math elements m:sSub and m:sSup).