All Developer Tools
65+ free online utilities organized by technology. All tools run locally in your browser - no uploads, no tracking, completely private.
Looking for tools by type? Browse formatters, converters, and generators on the homepage.
JSON Tools
Complete toolkit for working with JSON data
JSON Formatter
Pretty print and validate JSON with syntax highlighting
JSON Validator
Validate JSON syntax and structure
JSON to TypeScript
Generate TypeScript interfaces from JSON
JSON Schema Generator
Generate JSON Schema from sample data
JSON Schema Validator
Validate JSON against a schema
JSON Diff
Compare two JSON objects
Encoding & Decoding
Base64, Hex, Unicode, and URL encoding utilities
Base64 Encoder/Decoder
Encode and decode Base64 strings
Image to Base64
Convert images to Base64 encoding
Hex to ASCII
Convert hexadecimal to ASCII text
URL Encoder/Decoder
Encode and decode URL strings
Unicode Converter
Convert between Unicode formats
Base32 Encoder/Decoder
Encode and decode Base32 strings
HTML Entity Encoder
Encode and decode HTML entities
Hash & Security
Generate hashes, work with JWT, SSL certificates, and encryption
Hash Generator
Generate MD5, SHA-1, SHA-256 hashes
SHA-256 Generator
Generate SHA-256 hashes
MD5 Generator
Generate MD5 hashes
SHA-3 Generator
Generate SHA-3 hashes
Bcrypt Generator
Generate and verify bcrypt hashes
JWT Decoder
Decode and inspect JWT tokens
JWT Verifier
Verify JWT token signatures
JWT Creator
Create JWT tokens
SSL Certificate Decoder
Decode SSL certificates
Password Generator
Generate secure passwords
Text Utilities
Text formatting, counting, and manipulation tools
Data Format Conversion
Convert between JSON, YAML, XML, CSV, TOML
Code Formatters & Minifiers
Format and beautify code in various languages
Developer Utilities
Regex tester, cron builder, and other essential dev tools
Regex Tester
Test regular expressions with live matching
Cron Expression Builder
Build and validate cron expressions
Chmod Calculator
Calculate Unix file permissions
User Agent Parser
Parse and analyze user agent strings
HTTP Headers Viewer
View your HTTP request headers
UUID Generator
Generate UUIDs v1, v4, v5
QR Code Generator
Generate QR codes from text or URLs
Color Tools
Color converters, contrast checkers, and palette generators
Date & Time
Timestamp converters and date utilities
Calculators
Various calculation utilities
Code Playgrounds
Interactive code editors for testing
Network Tools
IP lookup and network utilities