Roman numeral converter

Convert numbers from 1 to 3999 into Roman numerals and back.

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How to use roman numeral converter

Choose a direction and enter a decimal number or Roman numeral.

Things worth knowing

Uses standard subtractive notation such as IV and IX. Noncanonical strings such as IIII are rejected.

Is my input saved or uploaded?

Your input is processed locally and is not saved by this site. Reloading or leaving the page clears your work. Copy or download anything you want to keep. Only saved and recent tool IDs are stored on this device.

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