What's the valid number range?

Standard Roman numerals support whole numbers from 1 to 3999.

Does it validate malformed Roman numerals?

Yes, an invalid or non-canonical numeral (like IIII) shows a clear error.

Yes, Roman numeral input is automatically uppercased before conversion.

Convert between numbers and Roman numerals.

Works Offline

Privacy First

No Login

No API

Number (1–3999)

MCMXCIV

Roman numeral

1994

Convert whole numbers from 1 to 3999 into Roman numerals, or decode Roman numerals back into standard numbers, with validation for malformed input.

Year 1994

Output

MCMXCIV

Converters

Convert between base64/data URI text and image previews.

Converters

Convert text to binary or octal codes and back.

Converters

Convert between CSV and JSON with delimiter and header options.

Converters

Convert CSV into a Markdown or HTML table with alignment options.

Converters

Generate SQL INSERT statements from CSV data.

Converters

Convert CSV data into well-formed XML with custom tag names.

Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser