Free Online Developer Tools
Fast, free, and privacy-focused tools that run in your browser.
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Base64 Encoder/Decoder
Encode and decode Base64 strings with Unicode support
URL Encoder/Decoder
Encode and decode URL strings and query parameters
HTML Encoder/Decoder
Encode and decode HTML entities
JWT Decoder
Decode and inspect JSON Web Tokens
JSON Formatter
Format, validate, minify, and explore JSON data
SQL Formatter
Format and beautify SQL queries
Markdown Preview
Write and preview Markdown in real-time
QR Code Generator
Generate QR codes from text or URLs, download as PNG/SVG
Password Generator
Generate strong random passwords with crypto-grade randomness
UUID Generator
Generate UUID v4 unique identifiers
Lorem Ipsum Generator
Generate placeholder text for designs and mockups
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
Color Converter
Convert between HEX, RGB, HSL color formats
Timestamp Converter
Convert Unix timestamps to human-readable dates
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal
CSS Unit Converter
Convert between px, em, rem, vw, vh, % units
Word Counter
Count words, characters, sentences, paragraphs, and reading time
Regex Tester
Test and debug regular expressions with real-time matching
Text Diff Checker
Compare two texts and highlight differences
Case Converter
Convert text between camelCase, snake_case, PascalCase, etc.
User Agent Parser
Parse and analyze browser user agent strings
MIME Type Lookup
Look up MIME types by file extension or vice versa