Developer Tools

JSON, Base64, regex, hash. Browse 29 free developer tools below — every tool runs instantly in your browser with no signup, no install, and no watermark.

All Developer Tools

  • JSON Formatter — Format and validate JSON
  • Base64 Encode/Decode — Encode and decode Base64
  • URL Encoder/Decoder — Encode and decode URLs
  • JWT Decoder — Inspect JWT tokens
  • Regex Tester — Test regular expressions
  • Hash Generator — MD5, SHA-1, SHA-256, SHA-512
  • UUID Generator — Generate v4 UUIDs
  • QR Code Generator — Create downloadable QR codes
  • CSV to JSON — Parse CSV into JSON array of objects
  • JSON to CSV — Export JSON arrays to a CSV file
  • YAML ↔ JSON — Convert YAML to JSON and back
  • Markdown to HTML — Live MD preview + HTML export
  • HTML to Markdown — Convert HTML back to clean Markdown
  • Cron Parser — Explain cron + show next 5 runs
  • Text Diff Checker — Side-by-side line diff of two texts
  • Timezone Converter — Compare a time across world timezones
  • SQL Formatter — Beautify SQL queries instantly
  • HTML Entity Encoder — Encode/decode HTML entities
  • Hex ↔ RGB — Quick hex/RGB color converter
  • Unix Timestamp Converter — Convert between Unix time and dates
  • Live HTML Preview — Edit HTML and see it render live
  • CSS Minifier & Beautifier — Minify or beautify CSS
  • JavaScript Minifier — Strip comments and whitespace
  • Color Palette from Image — Extract dominant colors from a photo
  • User Agent Parser — Detect browser, OS, and device
  • My IP Info — Show your public IP and location
  • URL Parser — Break a URL into all its parts
  • String Escape / Unescape — Escape JS strings, URL encode/decode
  • Number Base Converter — Bin / Oct / Dec / Hex conversions