Roman Numeral Converter
Convert Arabic numerals to Roman numerals, or Roman numerals to Arabic. Convert multiple lines at once — all processing happens inside your browser, so your values are never sent externally.
How to use
- Enter the values to convert, one per line, in the input box.
- Choose the conversion direction (number → Roman or Roman → number).
- Click "Convert", then copy the value in the result box with "Copy result".
Frequently asked questions
What is the maximum I can convert?
It converts 1 to 3999 following standard Roman numeral rules. Values out of range or in the wrong format are shown as a question mark.
Can I convert several at once?
Yes. Enter one per line and each line is converted in order.
Are the values I enter sent to a server?
No. All processing happens inside your browser, and the values you enter are never sent to any external server.