What is a UUID and How to Generate One
3 min read
UUIDs (Universally Unique Identifiers) are 128-bit identifiers that are practically guaranteed to be unique across all systems without coordination. They look like this: 550e8400-e29b-41d4-a716-446655440000.
Why Use UUIDs?
- Distributed systems - generate IDs on any server without conflicts
- Security - not guessable like sequential IDs
- Merging databases - no ID collisions when combining data
UUID v4: Random Generation
Version 4 UUIDs are randomly generated. With 122 random bits, the chance of collision is astronomically small - you'd need to generate a billion UUIDs per second for about 85 years to have a 50% chance of one duplicate.
Generate UUIDs with Toolium
The UUID Generator creates cryptographically random v4 UUIDs using your browser's crypto.randomUUID(). Generate one or bulk-generate up to 100 at a time, with one-click copy for each.
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