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Roman Numeral Converter

Input is processed locally Runs in your browser

Convert numbers and Roman numerals.

Enter one value per line, up to 1,000 values. Numbers must be integers from 1 to 3999. Roman input is case-insensitive and must be canonical: IV is valid, IIII is not. Blank lines are skipped. Invalid rows show their original line number.

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Convert Roman numerals

  1. Choose decimal-to-Roman or Roman-to-decimal mode.
  2. Enter one value per line. Supported integers range from 1 to 3,999; Roman input must use canonical notation.
  3. Convert the batch, inspect any line-specific errors, then copy or download the results.

Frequently Asked Questions

Does this tool require an account?
No account or payment is required. Input and output limits are shown in the workspace.
Where is my input processed?
The conversion runs in your browser. This tool does not send its input to a processing API. Site analytics and normal page requests are separate from your tool input.
How do I save the result?
Use the copy or download controls after a successful operation. For feed tools, export records the displayed response rather than requesting new data.