What is UUID Generator?

A Universally Unique Identifier (UUID) is a 128-bit label standardised as RFC 4122. Version 4 UUIDs are randomly generated using a cryptographically secure random number generator, giving them an astronomically low collision probability — roughly 1 in 5.3×10³⁶ per pair.

How to use UUID Generator

Click Generate to produce a single UUID, or set a count and use Bulk Generate to create up to 100 at once. Each UUID is shown in standard hyphenated format and can be copied individually or all at once.

Example

Single: 550e8400-e29b-41d4-a716-446655440000
Bulk (3):
  f47ac10b-58cc-4372-a567-0e02b2c3d479
  6ba7b810-9dad-11d1-80b4-00c04fd430c8
  6ba7b811-9dad-11d1-80b4-00c04fd430c8

Common use cases

1. Primary keys in SQL and NoSQL databases.

2. Unique session and transaction identifiers.

3. Idempotency keys for API requests.

4. Filenames for uploaded assets.

Frequently asked questions

How random are these UUIDs?▾

They use window.crypto.randomUUID(), which is the browser's cryptographically secure pseudorandom number generator (CSPRNG) — the same source used for TLS.

Are generated UUIDs stored anywhere?▾

No. Generation happens entirely client-side. Nothing is transmitted or logged.