Encoders10

🔐Base64 🔗Base64URL 🅱Base32 ₿Base58 🔗URL Encode / Decode 🏷️HTML Entity Encode / Decode 🔡String Escape/Unescape 🔢Text to Binary 🔡Text to Unicode 📡Text to NATO Phonetic

Converters26

🔄JSON ↔ YAML 📊JSON ↔ CSV Converter 🔢Number Base Converter ⏰Unix Timestamp Converter 🎨Color Converter 💾Byte Size Converter 🔐Chmod Calculator 🔤Text Case Converter ⅫRoman Numeral 📋List Converter 📋JSON → TOML 📋TOML → JSON 🔄YAML → TOML 🔄TOML → YAML 🔄JSON → XML 🔄XML → JSON 📝HTML → Markdown ✂️HTML Strip 📏CSS Unit Converter 🌍Timezone Converter ⏱Duration Converter 🔧Env / JSON Converter 📐Wrap Text ↩️Line Ending Converter ⇄Tab/Space Converter 📝Markdown → HTML

Formatters7

📋JSON Formatter 🗃️SQL Formatter 📐XML Formatter 📦JSON Minify 👁YAML Viewer 🎨HTML Formatter 🎨CSS Formatter

Generators23

🆔UUID v4 Generator 🕐UUID v7 Generator 🆔CUID2 Generator 🆔ULID Generator 📝Lorem Ipsum Generator 🔑Token Generator 🎲Nonce Generator 🚪Random Port Generator 🔌MAC Address Generator 🌐IPv6 ULA Generator 🖼SVG Placeholder Generator 🏷Meta Tag Generator 🔗Slugify 📱QR Code Generator 📶WiFi QR Code 📅Crontab Generator 🔧URL Builder 🛡CSP Builder 📑Markdown TOC Generator 📊Markdown Table Builder ✉️Mailto Builder 🌐DNS Record Template 📜License Picker

Security14

🔑Password Generator 🛡️Password Strength Checker #️⃣Hash Generator 🔏HMAC Generator 🧂Bcrypt 🔑RSA Key Pair 🔐TOTP Generator 🛡AES Encryption 🌱BIP39 Mnemonic 🪪Basic Auth 🔐htpasswd Generator 🎫JWT Decoder 🏗️JWT Builder 🔍JWT Verifier

Inspectors33

🔍Regex Tester 📊Diff Checker ⏰Cron Explainer 📡HTTP Header Inspector 🌐User-Agent Parser 🔗URL Parser 🔍JSON Diff 🩹JSON Patch 🔍JSONPath Tester 📁MIME Types 📞Phone Number Parser 🏦IBAN Validator 📧Email Normalizer 🛜HTTP Status Codes 🍪Cookie Parser 📊CSV Viewer 🏷Semver 📊Text Statistics 🔬Hex Dump 📦Gzip Size Estimator 🔗Markdown Link Extractor 🔡Regex Cheatsheet 🌿Git Cheatsheet ✏️Markdown Cheatsheet 🎨ANSI Color Codes 🔢ASCII Table ⌨️Keycode Reference ⌨️Vim Cheatsheet 🐚Bash Cheatsheet 🐳Docker Cheatsheet 🗄️SQL Cheatsheet 🎯CSS Selectors Cheatsheet 🔠Palindrome & Anagram

Network7

🌐CIDR / Subnet Calculator 🔢IPv4 Address Converter 📊IPv4 Range Expander 🔄IPv6 Expander / Compressor 🔌MAC Address Lookup 📦CIDR Aggregator 🔁EUI-64 Calculator

Math14

🧮Math Evaluator 📊Percentage Calculator ⏱ETA Calculator 📅Date Calculator ⬇️Download Time Estimator 🔢Prime Checker ➗GCD / LCM 🌀Fibonacci 🔤Numbers to Words 🎂Age Calculator 📆Weekday of Date 📊Stats Summary 💰Compound Interest 🏦Loan Calculator

📖API docs 💡Submit an idea

Encoders10

🔐Base64 🔗Base64URL 🅱Base32 ₿Base58 🔗URL Encode / Decode 🏷️HTML Entity Encode / Decode 🔡String Escape/Unescape 🔢Text to Binary 🔡Text to Unicode 📡Text to NATO Phonetic

Converters26

🔄JSON ↔ YAML 📊JSON ↔ CSV Converter 🔢Number Base Converter ⏰Unix Timestamp Converter 🎨Color Converter 💾Byte Size Converter 🔐Chmod Calculator 🔤Text Case Converter ⅫRoman Numeral 📋List Converter 📋JSON → TOML 📋TOML → JSON 🔄YAML → TOML 🔄TOML → YAML 🔄JSON → XML 🔄XML → JSON 📝HTML → Markdown ✂️HTML Strip 📏CSS Unit Converter 🌍Timezone Converter ⏱Duration Converter 🔧Env / JSON Converter 📐Wrap Text ↩️Line Ending Converter ⇄Tab/Space Converter 📝Markdown → HTML

Formatters7

📋JSON Formatter 🗃️SQL Formatter 📐XML Formatter 📦JSON Minify 👁YAML Viewer 🎨HTML Formatter 🎨CSS Formatter

Generators23

🆔UUID v4 Generator 🕐UUID v7 Generator 🆔CUID2 Generator 🆔ULID Generator 📝Lorem Ipsum Generator 🔑Token Generator 🎲Nonce Generator 🚪Random Port Generator 🔌MAC Address Generator 🌐IPv6 ULA Generator 🖼SVG Placeholder Generator 🏷Meta Tag Generator 🔗Slugify 📱QR Code Generator 📶WiFi QR Code 📅Crontab Generator 🔧URL Builder 🛡CSP Builder 📑Markdown TOC Generator 📊Markdown Table Builder ✉️Mailto Builder 🌐DNS Record Template 📜License Picker

Security14

🔑Password Generator 🛡️Password Strength Checker #️⃣Hash Generator 🔏HMAC Generator 🧂Bcrypt 🔑RSA Key Pair 🔐TOTP Generator 🛡AES Encryption 🌱BIP39 Mnemonic 🪪Basic Auth 🔐htpasswd Generator 🎫JWT Decoder 🏗️JWT Builder 🔍JWT Verifier

Inspectors33

🔍Regex Tester 📊Diff Checker ⏰Cron Explainer 📡HTTP Header Inspector 🌐User-Agent Parser 🔗URL Parser 🔍JSON Diff 🩹JSON Patch 🔍JSONPath Tester 📁MIME Types 📞Phone Number Parser 🏦IBAN Validator 📧Email Normalizer 🛜HTTP Status Codes 🍪Cookie Parser 📊CSV Viewer 🏷Semver 📊Text Statistics 🔬Hex Dump 📦Gzip Size Estimator 🔗Markdown Link Extractor 🔡Regex Cheatsheet 🌿Git Cheatsheet ✏️Markdown Cheatsheet 🎨ANSI Color Codes 🔢ASCII Table ⌨️Keycode Reference ⌨️Vim Cheatsheet 🐚Bash Cheatsheet 🐳Docker Cheatsheet 🗄️SQL Cheatsheet 🎯CSS Selectors Cheatsheet 🔠Palindrome & Anagram

Network7

🌐CIDR / Subnet Calculator 🔢IPv4 Address Converter 📊IPv4 Range Expander 🔄IPv6 Expander / Compressor 🔌MAC Address Lookup 📦CIDR Aggregator 🔁EUI-64 Calculator

Math14

🧮Math Evaluator 📊Percentage Calculator ⏱ETA Calculator 📅Date Calculator ⬇️Download Time Estimator 🔢Prime Checker ➗GCD / LCM 🌀Fibonacci 🔤Numbers to Words 🎂Age Calculator 📆Weekday of Date 📊Stats Summary 💰Compound Interest 🏦Loan Calculator

📖API docs 💡Submit an idea

HomeConvertersRoman Numeral

Ⅻ

Roman Numeral

Convert between integers and Roman numerals (1–3999)

Input

Mode

Integer → RomanRoman → Integer