Dev Tools
Everyday utilities for developers — subnet calculators, timestamp converters, UUID generators, and more. All free, all in your browser.
🌐 CIDR / IPv6 Subnet Calculator
Calculate network address, broadcast address, subnet mask, and usable IP range for both IPv4 and IPv6 CIDR notations. 100% client-side.
⏰ Timestamp Converter
Convert between Unix timestamps (seconds/milliseconds) and human-readable dates. Support for all timezones and ISO 8601 formats.
🆔 UUID Generator
Generate UUID v1, v4, and v7 identifiers individually or in bulk. Copy, download, and use in your applications instantly.
📋 JSON Formatter
Format, validate, and tree-view JSON data. Beautify minified JSON or validate structure with clear error messages.
🗄️ SQL Formatter
Format and beautify SQL queries online. Supports 15+ SQL dialects including MySQL, PostgreSQL, SQLite, and SQL Server.
🔍 Regex Tester
Test regular expressions with real-time highlighting and match groups. Supports PCRE, JavaScript, and Python regex flavors.
🔐 JWT Debugger
Decode, verify, and debug JWT tokens entirely in your browser. Inspect headers, payloads, and signatures with ease.
🎨 Color Picker & Converter
Pick colors visually and convert between HEX, RGB, HSL, and CMYK formats. Real-time preview with color harmony suggestions.
📄 Diff Checker
Compare text, code, and JSON side by side with syntax highlighting. Perfect for code review and merge conflict resolution.
🔐 Base64 Encoder/Decoder
Encode and decode Base64 strings and files. Supports URL-safe Base64, file upload, and batch processing.
🔗 URL Encoder/Decoder
Encode and decode URL-unsafe characters. Supports full RFC 3986 encoding for query strings and form data.
🏷️ HTML Entity Encoder
Convert special characters to HTML entities and back. Essential for escaping user input in web applications.