Online UUID Generator Tool

Here are the generated UUID V4 results

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UUIDs

FAQ

What is UUID?

A Universally Unique Identifier (UUID) is a 128-bit code used to generate a unique identifier in computer systems with an extremely low probability of duplication, without requiring central authority assignment. UUIDs have a near-zero chance of repetition, follow the RFC 4122 standard, and are defined by ISO and IETF.

What is UUID used for?

UUID can be used to generate API keys or credentials to secure systems, create session IDs to track user states, serve as database primary keys or indexes to ensure data uniqueness, mark operations in logs and event tracking, and prevent duplication or conflicts in distributed systems, ensuring reliable and precise identification and management of data, objects, and resources across different systems and environments.

What types of UUID exist?

UUID has multiple versions, with commonly used ones including v1 (time- and MAC-based), v4 (fully random), v7 (time-ordered with randomness), and the all-zero special Nil UUID for null or placeholder values. Our website provides tools for generating v1, v4, v7, and Nil UUIDs, supporting batch generation and file downloads, making it easy for developers to quickly create unique identifiers for database keys, API IDs, session IDs, and other use cases.

Recommended for you

UUID v1 Generator

A time-based UUID generated using timestamp and MAC address, containing time-series order information. Suitable for logging, event tracking, and applications requiring time-series order.

UUID v4 Generator

A UUID generated using random numbers, with global uniqueness and no identifiable information. The most commonly used type, suitable for API keys, session IDs, and secure identifiers.

UUID v7 Generator

A modern timestamp-based UUID standard combining time-series order and randomness, providing better database indexing performance for distributed systems.

UUID nil Generator

A special UUID with all bytes set to 0, used to represent empty values or uninitialized states. Suitable for database design and API development.