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Software Tools  /  Developer Tools
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Developer Tools

Ten tools built for developers who open a new browser tab a dozen times a day. Format and validate JSON, decode JWTs and Base64, generate UUIDs and passwords, test regex patterns, convert colours, preview Markdown, and convert Unix timestamps — all in your browser, nothing sent anywhere.

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JSON Formatter
Beautify messy JSON or crush it to a single line.
  • Validate JSON syntax and catch errors instantly
  • Pretty-print with indentation you can actually read
  • Minify for smaller API payloads
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B64
Base64 Encode / Decode
Convert text to Base64 and back — used in JWTs, auth headers, and data URLs.
  • Encode any text or string to Base64
  • Decode Base64 back to readable plain text
  • One-click copy to clipboard
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URL
URL Encoder / Decoder
Fix broken URLs and build clean query strings with special characters.
  • Encode spaces, &, =, and all special characters
  • Decode garbled percent-encoded URLs back to readable text
  • Essential for building API query parameters
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UUID
UUID Generator
Generate unique IDs for databases, APIs, and code in one click.
  • Cryptographically random v4 UUIDs
  • Generate one or many at once
  • One-click copy to clipboard
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Password Generator
Create strong, random passwords that actually hold up against attacks.
  • Customisable length up to 64 characters
  • Mix uppercase, lowercase, numbers, and symbols
  • Strength indicator so you know what you are getting
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JWT
JWT Decoder
Read the data inside any JWT token — no secret key needed.
  • Decodes header, payload, and signature sections
  • Shows token expiry time in plain English
  • Works on any JWT — no secret required
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Unix Timestamp Converter
Translate machine timestamps into dates you can actually read.
  • Convert any Unix timestamp to a readable date
  • Convert any date and time back to a timestamp
  • Shows both UTC and your local timezone
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MD
Markdown Preview
Write Markdown and see your formatted output instantly — before you publish.
  • Live side-by-side preview as you type
  • Supports headings, bold, italic, lists, code blocks, and tables
  • See exactly how your README or blog post will look
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🎨
Color Converter
Convert between HEX, RGB, and HSL — with a live colour preview.
  • Convert HEX → RGB → HSL in one step
  • Live colour preview swatch
  • Copy any format with one click
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Regex Tester
Test regex patterns against real text — with instant match highlighting.
  • Real-time match highlighting as you type
  • Shows all matches with index positions
  • Supports g, i, and m flags
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