Roman numeral converter
Enter a number to get its Roman numerals, or Roman numerals to recover the number. Conversion is live, with no data sent anywhere.
Frequently asked questions
Is anything sent to a server?
No. The conversion runs entirely in your browser — nothing is ever sent to our servers.
What range is supported?
Standard Roman numerals cover 1 to 3999. A number outside this range, or an invalid numeral, shows a short error message.
Is the input case-sensitive?
No. Roman numerals are read case-insensitively, so “mcmxciv” and “MCMXCIV” both give 1994.
Is this tool really free?
Yes — completely free, with no sign-up, no ads and no artificial limits.
Are my files kept or shared?
No. All processing happens directly in your browser: your file is never uploaded to our servers, stored, or shared. It never leaves your device.