Dev Tool box - Developer Tools
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About this app
Dev Toolbox is a fast, lightweight developer utility app for your mobile device 🛠️
Format JSON, encode URLs, decode Base64, inspect JWT tokens, and more -- all without opening your laptop ⚡
📋 Features
🔸 JSON Formatter — Pretty-print and validate JSON strings instantly.
🔸 URL Encode/Decode — Encode and decode URLs with RFC 3986 compliance.
🔸 Base64 Encode/Decode — Convert text to and from Base64. Supports URL-safe format.
🔸 JWT Decoder — Decode JWT tokens into Header, Payload, and Signature.
🔸 Text Case Converter — Convert between 9 text cases including camelCase, snake_case, kebab-case, PascalCase, and more.
🔸 Hash Generator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes at once.
🔸 Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates.
🔸 Number Base Converter — Auto-detect and convert between decimal, binary, octal, and hexadecimal.
🔸 String Escape/Unescape — Handle escape sequences in strings.
🔸 Color Converter — Convert between HEX, RGB, and HSL with a live color preview.
✨ Highlights
💾 Auto-save — Your input is saved and restored automatically.
🌙 Dark mode support
📋 One-tap copy to clipboard
📴 Fully offline — No internet connection required.
Format JSON, encode URLs, decode Base64, inspect JWT tokens, and more -- all without opening your laptop ⚡
📋 Features
🔸 JSON Formatter — Pretty-print and validate JSON strings instantly.
🔸 URL Encode/Decode — Encode and decode URLs with RFC 3986 compliance.
🔸 Base64 Encode/Decode — Convert text to and from Base64. Supports URL-safe format.
🔸 JWT Decoder — Decode JWT tokens into Header, Payload, and Signature.
🔸 Text Case Converter — Convert between 9 text cases including camelCase, snake_case, kebab-case, PascalCase, and more.
🔸 Hash Generator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes at once.
🔸 Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates.
🔸 Number Base Converter — Auto-detect and convert between decimal, binary, octal, and hexadecimal.
🔸 String Escape/Unescape — Handle escape sequences in strings.
🔸 Color Converter — Convert between HEX, RGB, and HSL with a live color preview.
✨ Highlights
💾 Auto-save — Your input is saved and restored automatically.
🌙 Dark mode support
📋 One-tap copy to clipboard
📴 Fully offline — No internet connection required.
Updated on
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No data shared with third parties
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No data collected
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What’s new
First release of Dev Toolbox.
- JSON Formatter
- URL Encode/Decode
- Base64 Encode/Decode
- JWT Decoder
- Text Case Converter
- Hash Generator (MD5, SHA-1, SHA-256, SHA-512)
- Unix Timestamp Converter
- Number Base Converter
- String Escape/Unescape
- Color Converter (HEX, RGB, HSL)
- JSON Formatter
- URL Encode/Decode
- Base64 Encode/Decode
- JWT Decoder
- Text Case Converter
- Hash Generator (MD5, SHA-1, SHA-256, SHA-512)
- Unix Timestamp Converter
- Number Base Converter
- String Escape/Unescape
- Color Converter (HEX, RGB, HSL)
App support
About the developer
심성곤
tjdrhs90@gmail.com
오현로 45
강북구, 서울특별시 01155
South Korea
