UUID Generator

A UUID (Universally Unique Identifier) is a 128-bit identifier standardized as RFC 4122. Use UUIDs as primary keys in distributed systems, unique session tokens, file names, or anywhere you need a globally unique ID without a central coordinator.

Yes — we use the Web Crypto API (crypto.randomUUID() or crypto.getRandomValues()) which provides cryptographically secure random numbers. These UUIDs are safe to use as security tokens, not just database keys.

UUID v4 uses random data for all bits (except version/variant bits) — it reveals nothing about when or where it was created. UUID v1 encodes the creation timestamp and MAC address, making it sequential but potentially leaking system info. Use v4 for most applications.

Astronomically low. UUID v4 has 122 random bits. To have a 50% probability of a collision, you would need to generate 2.7 × 10^18 UUIDs — roughly 85 years at 1 billion UUIDs per second.

Yes. UUIDs are ideal for distributed systems where multiple nodes create records without coordination. The tradeoff vs auto-increment integers is slightly larger storage (16 bytes vs 4–8 bytes) and potentially worse index locality in some databases. PostgreSQL's gen_random_uuid() uses the same algorithm.