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Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals back to numbers (1–3999).

100% Free
All tools are free to use
Instant Process
Get results in seconds
Browser-Based
Files never leave your device
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No uploads, 100% safe

About Roman Numeral Converter

Convert standard integers into Roman numerals and decode Roman numerals back into ordinary numbers. The tool covers the classic range 1 to 3999 and validates input in both directions so you always get a correct, well-formed result. It runs entirely in your browser — great for tattoos, clock faces, dates and homework.

How to use

  1. 1

    Choose a direction: Number → Roman or Roman → Number.

  2. 2

    Type your value into the input box.

  3. 3

    Read the converted result and copy it.

Tip: All processing is performed locally in your browser with zero loss in quality and no upload limits.

Frequently Asked Questions

Standard Roman numerals only use the symbols I, V, X, L, C, D and M, which top out at 3999 (MMMCMXCIX) without special overline notation for larger values.

All processing happens locally in your browser. Your files are never uploaded anywhere.