UUID / GUID Generator

Generate cryptographically secure 128-bit Universally Unique Identifiers (v4) locally in your browser. Used for database primary keys, API tokens, and distributed systems.

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Features of the Tool:

  1. Bulk Generation: Generate anywhere from 1 to 100 UUIDs instantly in a single click.
  2. Flexible Formatting Options:
    • Toggle between lowercase (f47ac10b...) and UPPERCASE (F47AC10B...).
    • Toggle 8-4-4-4-12 hyphens on or off.
    • Add surrounding braces { ... } for Windows C# / .NET GUID compatibility.
    • Add quotes "..." for quick insertion into JSON arrays or code declarations.
  3. 100% Client-Side Privacy: Your generated UUIDs are constructed in memory using your browser’s native JavaScript crypto API. No data is logged, transmitted, or stored on external servers.

Step-by-Step Guide: Generating UUIDs Online

Generating secure UUIDs for testing, database seeding, API design, or mock configuration files is simple with the UUID / GUID Generator on decodetool.com.

 ┌─────────────────────────────────────────────────────────────┐
 │                Configure Generation Settings                │
 └──────────────────────────────┬──────────────────────────────┘
                                │
                                ▼
 ┌─────────────────────────────────────────────────────────────┐
 │    Local Browser CSPRNG (crypto.getRandomValues)            │
 └──────────────────────────────┬──────────────────────────────┘
                                │
                                ▼
 ┌─────────────────────────────────────────────────────────────┐
 │ Formatted Output: uppercase, lowercase, hyphens, or braces  │
 └─────────────────────────────────────────────────────────────┘
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