UUID Generator
Generate one or many version 4 UUIDs (universally unique identifiers) instantly.
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What is a UUID?
A UUID (universally unique identifier) is a 128-bit value used to identify something — a database row, a file, an order, a session — without needing a central authority to hand out numbers. Version 4 UUIDs, the most common type, are generated using random bits, and the chance of two ever colliding is astronomically small.
They look like this: 3f7b1c4a-9e2d-4a3b-8f6a-2c1e5d9b7a01
Frequently asked questions
- Are these UUIDs guaranteed to be unique?
- They're generated using the browser's cryptographically secure random number generator, following the UUID v4 standard. Collisions are theoretically possible but so unlikely (roughly 1 in 2^122) that they're treated as unique in practice.
- How many can I generate at once?
- Up to 100 per click with this tool. Refresh and generate again for more.
- What's the difference between UUID versions?
- Version 1 is based on timestamp and MAC address, version 4 (what this tool generates) is fully random, and version 5 is derived from a namespace and name using a hash. Version 4 is the most commonly used for general-purpose IDs.