UUID Generator
Generate random UUID v4 identifiers. Bulk generation and multiple format options.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. Version 4 UUIDs are randomly generated, providing approximately 5.3 x 10^36 possible values, making collisions practically impossible.
Common Uses
UUIDs are widely used as database primary keys, API request identifiers, session tokens, distributed system correlation IDs, file naming, and anywhere a unique identifier is needed without a central authority.
Cryptographic Randomness
This generator uses crypto.randomUUID() when available, falling back to crypto.getRandomValues(). Both provide cryptographically secure random numbers, ensuring unpredictable and unique identifiers.
UUID v4 Format
A v4 UUID follows the pattern xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is any hex digit and y is one of 8, 9, a, or b. The '4' indicates version 4, and the y bits indicate the variant.