UUID v4 Generator Online

UUID (Universally Unique Identifier) is a standard 128-bit identifier represented as 32 hexadecimal digits separated by hyphens: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. Version 4 is randomly generated using a cryptographically secure source (random_bytes() in PHP).

Common Uses of UUID

• unique record identifiers in databases;
• temporary file and directory names;
• session keys and access tokens;
• event identifiers in distributed systems.

The probability of two random UUID v4 values colliding is negligibly small — on the order of 10⁻³⁷ even when generating a billion UUIDs per second for a hundred years.