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Roman Numeral Converter

Roman Numeral Converter, processed locally in your browser with copy and download.

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TEXT · NUMBERS · WORKSPACE

Roman Numeral Converter

Uses standard subtractive notation for 1–3999, case-insensitive. Zero, negative/fractional values and non-canonical forms are rejected.

Everything runs in this browser; input and output are not uploaded.

Processed content stays in this page’s memory and cannot be recovered after clearing or closing.

About this tool

Roman Numeral Converter, processed locally in your browser with copy and download. Supports Chinese and English interfaces; editing clears stale results.

How to use

  1. Enter text or load an example.
  2. Choose options and check the input format.
  3. Process, then copy or download. Reversible tools can swap direction.

Frequently asked questions

Is input uploaded?

Input and results stay in a browser Worker. Only run status, duration, counts and copy/download actions are reported.

How much input is supported?

Up to 200000 UTF-16 code units, subject to a lower admin limit. Numeric tools have additional digit or value ranges shown in the editor.

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