What is a UUID v4?
A UUID (Universally Unique Identifier) v4 is a 128-bit identifier generated from random numbers. The format is 8-4-4-4-12 hexadecimal digits. UUIDs are ideal for database primary keys, session tokens, and distributed systems where collision-free IDs are needed without a central coordinator.
Frequently Asked Questions
Are these UUIDs cryptographically secure?
Yes. This tool uses crypto.getRandomValues() (or crypto.randomUUID() when available) — the same APIs browsers use for secure random generation.
Does this validate UUID v1 or v3?
The validator checks standard UUID format (8-4-4-4-12 hex). It accepts any version nibble (1–5) but does not verify version-specific semantics beyond format.