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Superscript and Subscript Converter
Map numeric characters to or from Unicode superscript or subscript, with complete replacement and unmapped spans.
Pasted text, One UTF-8 text file
script-text.txt, script-conversion-report.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter text or select a UTF-8 file. Choose superscript or subscript, conversion direction and the unmapped-character policy.
- Select Convert script characters and review all replacement and unmapped spans.
- Download script-text.txt and script-conversion-report.json.
Examples
12+3 becomes ¹²⁺³ with superscript selected.
Limitations
- At most 200000 UTF-16 units, 800000 UTF-8 bytes and 5 MiB combined output; 30 seconds. Select one UTF-8 file to replace paste, including an empty file. Files preserve CRLF/CR/LF; a native textarea normalizes line endings to LF.
- At most 50000 combined replacement and unmapped-run records. Only digits 0–9, +, -, =, ( and ) are mapped. The other script is unmapped; letters, rich-text styling and mathematical interpretation are outside this tool.
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