UUID Generator
Generate random UUID v4 identifiers instantly. Generate 1 or bulk UUIDs. Free, cryptographically secure, no sign-up required.
Frequently asked
questions
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in software systems. The most common format is xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx (36 characters including hyphens).
UUID version 4 is randomly generated. It uses crypto.getRandomValues() in the browser for cryptographic randomness. The probability of generating the same UUID twice is astronomically low.
UUID v4 has 122 bits of randomness. The probability of a collision in 1 trillion UUIDs is about 1 in a billion. For practical purposes, they are unique.
Yes. UUID v4 is commonly used as primary keys, session IDs, API keys, and unique record identifiers in production databases and APIs.