UUID Generator
Generate random UUID v4 identifiers. Supports bulk generation and validation.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier designed to be unique across space and time without requiring a central registration authority. UUID v4, the most widely used version, is generated using cryptographically secure random numbers.
Click Generate to create a new UUID instantly, or use Bulk Generate to produce multiple UUIDs at once. You can toggle uppercase formatting and remove dashes for compact output. The Validate section lets you check whether a string is a properly formatted UUID.
UUIDs are used as database primary keys in distributed systems, unique session and request identifiers, file and resource naming in cloud storage, message IDs in event-driven architectures, and correlation IDs for distributed tracing. They eliminate the need for sequential ID coordination between services.
This tool generates UUIDs using the Web Crypto API (crypto.getRandomValues), providing 122 bits of randomness. With approximately 5.3 x 10^36 possible values, the probability of generating a duplicate is negligible — you would need to generate over a billion UUIDs per second for decades to have a meaningful collision chance.