UUID / GUID Generator
Instantly generate cryptographically secure, collision-free identifiers for your applications.
Core Parameters
Formatting Output
About Universally Unique Identifiers (UUID)
A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier) in the Microsoft ecosystem, is a 128-bit label used for information in computer systems. They are specifically designed to be generated without a central registration authority, guaranteeing uniqueness across databases, servers, and networks.
Version 4 (Cryptographically Random)
Version 4 is the modern standard for generating UUIDs. Our tool uses your browser's native cryptography API (or the industry-standard uuid mathematical library fallback) to generate purely random values. The chance of generating a duplicate V4 UUID (a collision) is so close to zero that it is mathematically negligible.
Version 1 (Timestamp & MAC)
Version 1 UUIDs are generated using a combination of the current time and the node's MAC address (simulated securely in the browser). While less common in modern apps, V1 is still required by certain legacy databases where chronological sorting of identifiers is necessary for indexing performance.