Convert between Arabic numbers and Roman numerals with notation breakdowns.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Select Decimal to Roman or Roman to Decimal conversion mode.
Type an Arabic number (1 to 3999) or a valid Roman string (e.g. MMXXVI).
Inspect the additive notation breakdown and copy the converted result.
Traditional Roman numerals without overline vinculum bars represent numbers up to 3999 (MMMCMXCIX).
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