Roman Numeral Converter
Convert numbers (1–3999) to Roman numerals and Roman numerals back to numbers. One number per line.
100% free No signup Private & offline-ready Works in your browser
About the Roman Numeral Converter
Roman numerals are used on clocks, in book chapters, movie sequels, event names and tattoos. Enter numbers from 1 to 3999 to get Roman numerals, or switch modes to read them back. Invalid numerals such as IIII or VX are flagged.
Frequently asked questions
Is the Roman Numeral Converter free?
Yes. The Roman Numeral Converter on Apex Tool Station is 100% free with no signup and no watermark. Browser tools have no usage limits.
Are my files or data uploaded to a server?
No. Everything runs locally in your browser using JavaScript. Your files and text never leave your device, which makes it safe for private documents.
Does it work on mobile?
Yes. The tool works on any modern browser on Android, iPhone, Windows, Mac and Linux.