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UUID Generator

Generate UUID v4 values instantly. Copy individually or all at once.

How to Use the UUID Generator

  1. Set the number of UUIDs you want to generate (1–50).
  2. Choose a format: standard, uppercase, no hyphens, or braces.
  3. Click Generate UUIDs.
  4. Copy individual UUIDs with the Copy button, or use Copy All to copy all as newline-separated text.

UUID Formats

FormatExample
Standard550e8400-e29b-41d4-a716-446655440000
Uppercase550E8400-E29B-41D4-A716-446655440000
No Hyphens550e8400e29b41d4a716446655440000
Braces{550e8400-e29b-41d4-a716-446655440000}

Use Cases

  • Generating primary keys for database records
  • Creating unique identifiers for distributed systems
  • Seeding test data with unique IDs
  • Generating correlation IDs for logging and tracing
  • Creating unique filenames or resource identifiers

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. It is standardized by RFC 4122 and designed to be unique across space and time without a central authority.

What is UUID v4?

UUID v4 is randomly generated. It uses 122 bits of randomness, making collisions astronomically unlikely. It is the most commonly used UUID version for general-purpose unique identifiers.

Is UUID the same as GUID?

Yes. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They follow the same RFC 4122 standard and are interchangeable in most contexts.

Are the generated UUIDs truly unique?

UUID v4 uses cryptographically secure random number generation via the Web Crypto API. The probability of generating two identical UUIDs is approximately 1 in 5.3 × 10³⁶ — effectively impossible in practice.

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