UUID Generator
Generate RFC 4122 version 4 UUIDs instantly. Uses the browser's cryptographic random generator for maximum security.
About UUIDs
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It is typically shown as 32 hexadecimal digits separated by hyphens, e.g. 550e8400-e29b-41d4-a716-446655440000.
What is UUID version 4?
Version 4 UUIDs are randomly generated. The randomness makes collisions extremely unlikely — about 1 in 2.71 × 10^36 even after generating 103 trillion UUIDs.
Is this generator cryptographically secure?
Yes. It uses the browser's crypto.getRandomValues() API when available, falling back to crypto.randomUUID() on modern browsers. The output is suitable for session tokens, IDs, and other security-sensitive uses.
How many UUIDs can I generate at once?
Up to 1000 at a time. Each generation is independent and the chance of any duplicates is effectively zero.