UUID Generator

A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. The format is 8-4-4-4-12 hexadecimal characters, like 550e8400-e29b-41d4-a716-446655440000.

UUID v4 is a randomly generated UUID. It uses 122 bits of randomness (6 bits are fixed to indicate version 4 and variant 1). The probability of collision is astronomically low.

While not mathematically guaranteed unique, UUID v4 uses 122 bits of randomness, making collision probability about 1 in 2^122. You would need to generate 2.7 quintillion UUIDs to have a 50% chance of one collision.

UUIDs are useful for database primary keys, distributed systems, session identifiers, file naming, and any scenario where you need unique identifiers without a central authority.

Yes, this tool uses crypto.getRandomValues() which is a cryptographically secure random number generator built into your browser. All generation happens locally.