Generate cryptographically random UUID v4 identifiers instantly. Bulk generation with format options and persistent history.
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. The format is 8-4-4-4-12 hex digits, e.g. 550e8400-e29b-41d4-a716-446655440000.
Version 4 UUIDs are generated using random or pseudo-random numbers. They use crypto.randomUUID() for cryptographic randomness, making collisions practically impossible (1 in 2^122).
Database primary keys, session tokens, API request IDs, file naming, distributed systems, message queues, and any scenario requiring unique identifiers without coordination.
GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They are functionally identical. GUIDs often use braces: {550e8400-...}.
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