Free Online Developer Tools

Format, validate, and minify JSON data with syntax highlighting

Encode and decode Base64 strings instantly

Encode and decode URL components instantly

Decode and inspect JWT tokens — header, payload, and expiration

Generate random UUID v4 identifiers in bulk

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text

Test regular expressions with real-time matching and highlighting

Convert between Unix timestamps and human-readable dates

Format and beautify SQL queries with syntax highlighting

Compare two texts and highlight the differences

Convert colors between HEX, RGB, and HSL formats with live preview

Convert between YAML and JSON formats instantly

Convert between CSV and JSON formats with header detection

Generate TypeScript interfaces from JSON data automatically

Build and decode cron expressions with a visual editor

Encode and decode HTML entities for safe web content

Convert numbers between binary, octal, decimal, and hexadecimal

Convert text between camelCase, snake_case, kebab-case, and more

Escape and unescape special characters in strings

Convert text to URL-friendly slugs for SEO-optimized URLs

Generate placeholder text in paragraphs, sentences, or words

Write Markdown and see the rendered HTML preview in real-time

Find and query all paths in a JSON object

Generate secure random passwords with customizable options

Calculate Unix file permissions in octal and symbolic notation

Convert text to ASCII art with multiple font styles

Convert IPv4 addresses between decimal, binary, hex with subnet calculator

Minify JavaScript code by removing comments and whitespace

Count words, characters, sentences, and analyze text statistics

Generate QR codes from text or URLs with customizable colors and size