NumbersHistoryLatin
Translate numbers to the language of empires.
Instantly convert integers between 1 and 3,999 to their Roman numeral counterparts. Validates syntax in real-time as you type.
Decimal
Standard Integer
Roman
Numeral String
Reference
Standard Rules
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
Quick Look
Subtraction Rules
IV 4
IX 9
XL 40
XC 90
CD 400
CM 900
Other Live Tools
Continue through the library
/regex-checker Regex Checker
Test and debug regular expressions in real-time with detailed match highlights, capture groups, and cross-browser flag support.
/diff-checker Diff Checker
Identify precise differences between two text blocks with side-by-side or inline views, highlighting insertions and deletions.
/json-formatter JSON Formatter
Beautify, validate, and minify JSON data with automatic key sorting and syntax error detection for easier debugging.
/csv-json-converter CSV ↔ JSON
Bidirectional converter for CSV and JSON formats with support for quoted fields, custom headers, and nested data preservation.
/unit-converter Unit Converter
Instant conversion for length, mass, temperature, and digital storage units using precise mathematical constants.
/age-calculator Age Calculator
Calculate chronological age in years, months, and days, and track time remaining until next birthdays or anniversaries.
/color-palette Color Palette
Explore and generate color formats including HEX, RGB, HSL, and HWB with built-in accessibility and contrast checks.
/base64-converter Base64 Converter
Encode or decode strings to Base64 format with full UTF-8 support, ideal for handling data URIs and binary-to-text requirements.
/hash-generator Hash Generator
Generate cryptographically secure hashes (MD5, SHA-256, SHA-512) locally for data integrity and checksum verification.
/jwt-decoder JWT Decoder
Parse and inspect JSON Web Tokens instantly to view header and payload claims without sending data to any server.
/qr-code QR Code Utility
Create custom QR codes from any text or URL, or use your camera to scan and decode existing QR images on the fly.
/barcode-utility Barcode Utility
Generate and scan various 1D barcode formats including CODE128, EAN, and UPC for retail and inventory management.
/password-generator Password Generator
Generate high-entropy, random passwords with customizable lengths and character sets using secure cryptographic primitives.
/password-strength-checker Password Strength
Verify password security using entropy-based scoring and pattern detection to ensure high safety standards.
/token-generator Token Generator
Generate secure random tokens in Hex, Base64, or Alphanumeric formats for API keys and secrets.
/word-character-counter Word Counter
Real-time text analysis for word count, character density, and estimated reading time for writers and editors.
/case-converter Case Converter
Quickly switch between UPPERCASE, lowercase, Title Case, and camelCase to match your project standards.
/url-encoder-decoder URL Encoder/Decoder
Safely escape or unescape special characters in URL parameters to prevent broken links and data errors.
/duplicate-line-remover Duplicate Line Remover
Clean up messy lists and logs by removing identical lines with optional case sensitivity and whitespace handling.
/markdown-converter Markdown Converter
Preview Markdown in real-time or convert it to clean HTML for web publishing and documentation.
/cron-job-generator Cron Job Generator
Build and debug cron expressions with a visual schedule builder and human-readable descriptions of execution intervals.
/image-converter Image Converter
Switch between PNG, JPG, and WebP image formats instantly without any server uploads for total privacy.
/image-resizer Image Resizer
Scale your images to precise pixel dimensions or percentages with high-quality resampling filters.
/image-cropper Image Cropper
Cut and rotate images with pixel-perfect accuracy using common aspect ratio presets or freeform selection.
/blur-pixelate-image Blur/Pixelate Image
Anonymize sensitive data in images using freehand brush or rectangular blur and pixelate effects.
/equation-visualizer Equation Visualizer
Plot and visualize 2D mathematical functions on an interactive coordinate system with real-time updates.
/html-css-js-minifier HTML/CSS/JS minifier
Compress markup, styles, and scripts to reduce file size and improve web page load speeds.
/file-metadata-viewer File Metadata Inspector
View hidden file properties, EXIF data for images, and deep system attributes without server uploads.
/text-analyzer Text Analyzer
Automatically parse and extract contact information, links, and social handles from any block of text.
/matrix-multiplier Matrix Multiplier
Perform matrix multiplication and visualize the step-by-step linear algebra calculation process.
/time-toolkit Time Toolkit
Convert timezones, analyze Unix timestamps, and calculate precise durations with a professional-grade time utility.