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Roman Numeral Converter

Convert integers from 1 to 3999 into Roman numerals, or decode canonical Roman notation back to decimal.

Convert in your browser · No sign-up

Uses subtractive forms such as IV and IX. Zero, negative numbers, overbars and noncanonical forms such as IIII are rejected.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Result

Add your input or load an example, then run the tool. Your result will appear here.

How to use

  1. Convert integers from 1 to 3999 into Roman numerals, or decode canonical Roman notation back to decimal.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

2026 → MMXXVI

Details and limitations

Text stays in your browser; it is not sent to a conversion server.

Format references

Tool page updated: