UUID Generator

Generate RFC 4122 version 4 UUIDs (Universally Unique Identifiers)

Generate UUIDs

Validate UUID

About UUID 4

UUID (Universally Unique Identifier) version 4 generates 128-bit identifiers using random or pseudo-random numbers. With 122 random bits, there are 5.3×10³⁶ possible UUIDs, making collisions extremely unlikely.

Format Structure:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
  • 122 bits are randomly generated (variant and version bits excluded)
  • The 4 at position 13 indicates version 4
  • The y at position 17 is always 8, 9, a, or b (variant identifier)
  • Generated using crypto.randomUUID() - cryptographically secure