Convert decimal integers to Roman numerals and validate Roman numerals back to numbers. Use conventional subtractive notation from 1 to 3,999.
Your values are never uploaded to a server. This converter uses self-hosted JavaScript and runs on your device, without accounts, remote processing or saved input history. Its shared engine can also be reused in the planned Conversion Workspace.
Convert decimal integers to Roman numerals and validate Roman numerals back to numbers. Use conventional subtractive notation from 1 to 3,999.
Conventional Roman numerals from 1 to 3,999. Lowercase is accepted and normalized. Zero, negatives, noncanonical forms such as IIII/IC, fractions and overlines are unsupported.
No. Inputs and generated reports remain in this page until you copy or download them. No network API, analytics submission or input storage is used. The website saves only your theme preference.
Yes. Each converter remains a standalone tool within Conversion Tools. Category shortcuts open other tools, and related links suggest relevant conversions. Inputs do not transfer when navigating. A combined Conversion Workspace is planned after the standalone collection.
