MathRuns locally · No upload
Roman Numeral Converter
Convert Arabic numbers (1–3999) to Roman numerals and decode Roman numerals back to numbers. Useful for outlines, clocks, and historical dates.
Private by design
Everything runs in your browser. Your input is never uploaded, stored, or logged on our servers.
Works offline after load
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Frequently asked questions
Is this tool free?+
Yes. Every Utiliio utility is free with no sign-up, usage limits, or paywalls.
Do you store my data?+
No. Processing happens entirely in your browser. Your input never leaves your device.
Can I use this tool offline?+
Yes. Once the page loads, most tools continue working without an internet connection.