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Roman Numeral Converter
Translate between Arabic numbers and Roman numerals in both directions, with validation.
MMXXVI
2026
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
What range does it support?＋
1 to 3999, the standard range of classical Roman numerals, in both directions.
Why can't it go above 3999?＋
Standard Roman numerals have no symbol beyond M (1000); larger numbers need overlines that aren't part of the basic system.
Is my input private?＋
Yes — conversion happens in your browser.