Developer tools that stay in your browser
Practical browser-only tools for developers.
JSON Formatter & Model Generator
Format JSON and generate Swift Codable structs or Kotlin data classes from the same input.
URL Encode/Decode & Deep Link Parser
Easily encode, decode, and parse URL parameters for debugging.
UNIX Timestamp ⇄ Date Converter
Convert between UNIX timestamps and date-time. Features auto-detection of seconds/milliseconds and flexible parsing of loose date formats.
QR Code Generator
Generate QR codes from text or URLs. Customize sizes, colors, error correction levels, and download as PNG or SVG.
Favicon Generator
Create favicons from images, emoji, or text. Download favicon.png, apple-touch-icon.png, and favicon.ico as a ZIP bundle.
JWT Decoder & Inspector
Decode JWT tokens, inspect expiration in real-time, edit claims, and resign using an HS256 secret key entirely in your browser.
Regex Tester & Visualizer
Test regular expressions with real-time match highlighting, capture group extraction, replace output, and cheatsheet insertions.
YAML Formatter & YAML ↔ JSON Converter
Bidirectional real-time YAML ↔ JSON conversion with syntax validation, tree view, JSON Schema generation, Git-style diff, key sorting, and template snippets.
Advanced Text & JSON Diff Checker
Compare text or JSON differences securely in your browser. Features UI freeze protection via Web Workers, semantic JSON Tree Diff, credential masking, and standalone HTML export.