Code Tools
Essential code utilities for developers across all languages. Test and debug regular expressions with live matching and group highlighting, format and minify JavaScript, HTML, CSS, SQL, Python and PHP, encode and decode Base64, URL strings and HTML entities, decode JWT tokens, generate UUID v1/v4/v7, build and test cron expressions, generate realistic mock data, escape and unescape strings for JSON, HTML, XML and SQL, calculate Unix file permissions, look up HTTP status codes, write HTML/CSS/JS with live preview, convert text to binary, hex and octal, browse the full ASCII table, and convert between CSS units like px, rem, em and pt.
Convert between px, rem, and em CSS units instantly. Set your base font size for accurate responsive design calculations.
Browse and search all HTTP status codes with descriptions, use cases, common headers, and related codes.
Escape and unescape strings for JSON, XML, SQL, JavaScript, Python, C/Java, CSV, RegEx, and Shell with real-time conversion.
Browse, search, and copy from the complete ASCII character table with decimal, hex, octal, binary, and HTML representations.
Calculate Unix file permissions in symbolic, octal, and chmod command formats with an interactive permission matrix.
Minify JavaScript, CSS, and HTML code to reduce file size with real-time compression stats and configurable options.
Build and test cron job expressions with a visual builder, human-readable descriptions, and next execution time preview.
Write HTML, CSS, and JavaScript code with instant live preview in a sandboxed environment — like a mini CodePen.
Generate realistic fake data for testing — names, emails, phones, addresses, and 30+ data types with multi-locale support.
Decode and inspect JSON Web Tokens instantly. View header, payload, signature with claims explanation and expiration status.
Format and beautify source code for JavaScript, HTML, CSS, SQL, Python, and PHP with customizable indentation and language-specific options.
Test and debug regular expressions with live matching, capture group highlighting, replace mode, and a built-in cheatsheet.