Roman Numeral Converter
Text ToolsNumbers ↔ Roman numerals (1–3999)
Embed this tool on your websiteFree
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- Press Copy code.
- Paste it into your page, blog, WordPress or Notion HTML block.
The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.
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History
All history →Roman Numeral Converter — at a glance
Switch between everyday numbers and Roman numerals instantly.
How to use it — step by step
A number from 1 to 3999, or a Roman numeral like XIV.
Paste your input
Paste or type your content into the big input box.
Convert
Press the button. The result is created instantly on your device.
Copy the result
Check the output and press Copy to use it anywhere.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
Why can’t I convert 4000?+
Standard Roman numerals use at most three M’s, so the largest number is 3999 (MMMCMXCIX).
Is IIII valid for 4?+
Standard form uses IV. IIII appears on some clocks but is not the standard numeral.
What is the Roman numeral for 0?+
There is none — the Romans had no symbol for zero.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.