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UUID Generator

Generate unique UUID identifiers

ID Type

Format Options

About UUID v4

Randomly generated UUID (Version 4)

Example:

550e8400-e29b-41d4-a716-446655440000

Benefits:

  • Cryptographically random
  • No collision risk
  • Platform independent
  • RFC 4122 compliant

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized as RFC 4122. The most common format is a 32-character hexadecimal string divided by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are used as unique keys in databases, APIs, and distributed systems.

What is the difference between UUID v1, v4, and v7?

UUID v1 is time-based and includes the MAC address of the generating machine, making it traceable but potentially privacy-sensitive. UUID v4 is fully random with 122 bits of randomness, offering no predictability. UUID v7 is a newer format that encodes a Unix timestamp for sortability while remaining random.

How unique are UUIDs really?

UUID v4 has 2^122 possible values (approximately 5.3 × 10^36). The probability of generating two identical UUIDs is astronomically small — generating a billion UUIDs per second for 100 years would still give you a less than 1 in a billion chance of a collision.