Generate one or more random UUID v4 identifiers, commonly used for unique database keys, session tokens and object identifiers.
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A UUID (Universally Unique Identifier) is a 128-bit value typically written as 32 hexadecimal characters split into five groups, such as 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are generated using random or pseudo-random numbers, making collisions (two identical UUIDs) astronomically unlikely even across billions of generated values.
UUIDs are commonly used as database primary keys, session identifiers, API request tracking IDs, and unique object references in distributed systems, anywhere a unique identifier is needed without coordinating with a central authority.
Setting count to 3 and generating produces three independent version 4 UUIDs, such as 3fa85f64-5717-4562-b3fc-2c963f66afa6, 9b2e4f1a-8c3d-4a7e-9f1b-6d5c8e2a0f4b, and c1a2b3d4-e5f6-4789-a1b2-c3d4e5f6a7b8. Each one has '4' as the first character of the third group (marking version 4) and a variant digit of 8, 9, a, or b as the first character of the fourth group, the rest of the characters are randomly generated hexadecimal digits.
Assuming UUIDs are sequential or sortable by creation time, version 4 UUIDs are fully random, so they carry no information about when they were generated, use a timestamp field or a UUID v7/ULID if ordering matters.
Using a freshly generated UUID as a human-facing reference number (like an order number a customer reads over the phone), UUIDs are long and error-prone to transcribe by hand, a shorter alphanumeric code is usually better for that purpose.
Assuming every 32-character hex string is a valid UUID, a valid v4 UUID has specific version and variant digits in fixed positions, use the UUID Validator to check whether a given string actually conforms to the format.
UUID v4 uses randomness that makes collisions extremely unlikely in practice, though not mathematically impossible, this is the standard used across most production systems.
Yes, this uses your browser's built-in cryptographically secure random number generator when available, and never sends any data to a server.
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