UUID Generator
Generate version 4 UUIDs individually or in bulk for databases and APIs.
Utilities
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A UUID (universally unique identifier) is a 128-bit value used to label records, files and API resources without a central counter. Version 4 UUIDs are random, making accidental collisions astronomically unlikely. This generator produces valid v4 UUIDs one at a time or in batches.
How to generate UUIDs
- Choose how many UUIDs you need.
- Click Generate.
- Optionally switch to uppercase or strip the hyphens.
- Copy a single value or the whole list.
Anatomy of a v4 UUID
| Part | Example | Meaning |
|---|---|---|
| Format | xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx |
36 characters with hyphens |
| Version digit | the 4 |
Marks it as random (v4) |
| Variant | the y (8,9,a,b) |
RFC 4122 variant bits |
Generator features
- Standards-compliant version 4 UUIDs.
- Bulk generation for seeding databases or tests.
- Uppercase and no-hyphen formatting options.
- Uses the browser’s secure randomness, entirely offline.
Frequently asked questions
Could two UUIDs ever collide?
In theory yes, but the probability is so small that for practical purposes v4 UUIDs are treated as unique.
What is the difference between UUID and GUID?
They are the same thing. GUID is Microsoft’s name for a UUID; the format is identical.
Are these safe to use as secret tokens?
They are random but not intended as security tokens. For secrets, use a dedicated cryptographic token generator.