What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label formatted as 32 hexadecimal digits split into five groups by hyphens, for example 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are randomly generated, giving an astronomically low chance of two identical values ever being produced.
UUIDs are widely used as database primary keys, session tokens and unique identifiers in distributed systems where a central authority cannot assign IDs. This tool uses the browser's built-in crypto.randomUUID() which is cryptographically secure.