Free Online Developer Tools
A collection of powerful, easy-to-use tools for developers. All tools run client-side for maximum privacy and speed.
JSON Formatter & Validator
Format, validate, and beautify JSON data with syntax highlighting and error detection
JSON ⇄ Python Converter
Convert between JSON and Python dict formats with formatting and validation
Base64 Encode/Decode
Encode and decode Base64 strings and files with support for multiple formats
JWT Decoder
Decode and validate JWT tokens, view header, payload, and signature
URL Encode/Decode
Encode and decode URLs and query parameters with real-time conversion
UUID/GUID Generator
Generate UUID v4 identifiers with customizable options and bulk generation
Password Generator
Generate secure random passwords with customizable length and character options
Text Diff & Compare
Compare two text blocks side-by-side with line numbers and visual highlighting
Live Diff Editor
Side-by-side text editor with live diff highlighting and real-time statistics
Code Playground
Online HTML, CSS, and JavaScript editor with live preview and console debugging
CSV Viewer & Editor
View, edit, search, and manipulate CSV files online with powerful data tools
Hash Generator
Generate SHA-1 and SHA-256 hashes from text instantly
Color Converter
Convert between HEX, RGB, HSL, and other color formats
Timestamp Converter
Convert between Unix timestamps and human-readable dates
Markdown Preview
Live markdown editor with real-time HTML preview and syntax highlighting
CSV ↔ JSON Converter
Convert between CSV and JSON formats with customizable options
JSON ↔ YAML Converter
Convert between JSON and YAML formats with validation
API Tester & HTTP Client
Test HTTP APIs with different methods, headers, and request bodies. No setup required.
QR Code Generator
Generate QR codes from text, URLs, and data. Customize colors, size, and error correction level.
Image Optimizer & Compressor
Compress, resize, and convert images. Reduce file size while maintaining quality.
Random Data Generator
Generate fake names, emails, phone numbers, addresses, and more for testing and development.
Email Validator
Validate email addresses, check syntax, and verify format. Supports batch validation and detailed error reporting.
Regex Tester
Test regular expressions in real-time. Match patterns, capture groups, validate syntax with instant visual feedback.
Number Converter
Convert between Decimal, Hexadecimal, Binary, and Octal number systems with real-time conversion.
Text Statistics Analyzer
Analyze text for character count, word count, reading time, and detailed linguistic statistics.
SSH Key Generator
Generate secure SSH key pairs (RSA, ECDSA, Ed25519) for remote authentication. No data stored.
JSON Path Extractor
Extract data from JSON using JSONPath syntax. Query nested objects, arrays, and complex structures.
Fast & Efficient
All tools run locally in your browser for instant results
100% Private
Your data never leaves your device - complete privacy guaranteed
Always Free
No subscriptions, no limits - all tools are completely free