{"$schema":"https://toolsly.tools/schemas/tool-manifest-v1.json","generated":"2026-06-02T15:45:19.934Z","discovery":{"catalog":"https://toptool.io/tools.json","llmsTxt":"https://toptool.io/llms.txt","sitemap":"https://toptool.io/sitemap.xml"},"relatedTools":[{"slug":"salary-converter","name":"Salary Converter","url":"https://toptool.io/salary-converter"},{"slug":"number-to-words","name":"Number to Words Converter","url":"https://toptool.io/number-to-words"},{"slug":"scientific-notation-converter","name":"Scientific Notation Converter","url":"https://toptool.io/scientific-notation-converter"},{"slug":"timezone-converter","name":"Timezone Converter","url":"https://toptool.io/timezone-converter"},{"slug":"bytes-converter","name":"Bytes Converter","url":"https://toptool.io/bytes-converter"},{"slug":"length-converter","name":"Length Converter","url":"https://toptool.io/length-converter"},{"slug":"weight-converter","name":"Weight Converter","url":"https://toptool.io/weight-converter"},{"slug":"temperature-converter","name":"Temperature Converter","url":"https://toptool.io/temperature-converter"}],"kind":"utility","slug":"roman-numeral-converter","name":"Roman Numeral Converter","description":"Convert between Roman numerals and integers — validates input and handles values from 1 to 3,999.","longDescription":"Enter an integer to convert it to a Roman numeral, or enter a Roman numeral to convert it to an integer. The tool validates the input and ensures the Roman numeral follows standard subtractive notation rules (e.g. IV for 4, not IIII). Supports values from 1 (I) to 3999 (MMMCMXCIX). Useful for history, clock faces, movie copyright dates, Super Bowl numbers, outline numbering, and educational exercises. Round-trip validation ensures the numeral is canonical. Runs entirely in your browser.","category":"calc","categoryName":"Calculators","keywords":["roman numeral converter","roman numeral converter online","roman to number","number to roman","roman numeral calculator","roman numeral translator","convert roman numerals","roman numeral chart","roman numeral decoder","integer to roman","arabic to roman","roman numeral tool","roman numerals free"],"badge":"Converter","url":"https://toptool.io/roman-numeral-converter","inputs":[{"type":"select","key":"mode","label":"Conversion mode","defaultValue":"to-roman","choices":[{"value":"to-roman","label":"Integer → Roman numeral"},{"value":"from-roman","label":"Roman numeral → Integer"}]},{"type":"text","key":"value","label":"Value","placeholder":"e.g. 42 or XLII","monospace":true,"help":"Enter an integer (1–3999) or a Roman numeral."}],"outputs":[{"key":"result","label":"Result"},{"key":"validation","label":"Validation"}],"invocation":{"webUi":"https://toptool.io/roman-numeral-converter","api":null,"notes":"Currently invoked via the web UI at `webUi`. Inputs are form fields; outputs are structured text values. A remote MCP/REST API is planned."}}