UUID Generator

Generate random UUIDs (Universally Unique Identifiers) in various formats. All generation happens in your browser.

Options
v4 is most commonly used for random IDs
UUIDs
Generate up to 1000 UUIDs at once
Press Ctrl+Enter to generate
Generated UUIDs
Quick Generate
What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all space and time. UUIDs are commonly used in databases, distributed systems, and APIs to uniquely identify resources.

UUID Versions:
Version 4 (Random)

Generated using random or pseudo-random numbers. Most commonly used for generating unique IDs in applications. The probability of collision is astronomically low.

Version 1 (Timestamp)

Generated using timestamp and MAC address. Useful when you need time-ordered IDs. Note: browser implementation uses random node ID for privacy.

UUID Format:

xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx

  • M indicates the UUID version (1, 4, etc.)
  • N indicates the variant (typically 8, 9, a, or b)
  • Total: 36 characters including hyphens, 32 hexadecimal digits
Frequently Asked Questions

Yes! UUID v4 uses cryptographically strong random numbers. The probability of generating two identical UUIDs is approximately 1 in 5.3 x 10^36 - essentially impossible in practice.

UUID v4 is recommended for most use cases. It's simple, has no privacy concerns, and is universally supported. Use UUID v1 only if you need time-based ordering and understand the privacy implications.

Absolutely! UUIDs generated here use the Web Crypto API for secure random number generation. They are suitable for database primary keys, API identifiers, session tokens, and any other production use case.