UUID v4 Generator
Generate random, cryptographically secure UUIDs (also known as GUIDs) version 4. Use them in databases, APIs, tokens and anywhere you need a unique identifier.
UUID v4 per RFC 4122. Cryptographically secure generation via crypto.randomUUID().
What is UUID Generator?
Generates universally unique identifiers (UUID/GUID) version 4, based on cryptographically secure random numbers. UUIDs are used as identifiers in databases, APIs and distributed systems when you need unique IDs without central coordination.
How to use
- Click generate to create a new UUID v4.
- Generate several at once if needed.
- Pick the format: standard (with hyphens) or compact.
- Use the copy button on any item in the list.
When to use UUIDs
- 🗄️ Primary keys in distributed databases
- 🔑 API tokens and session identifiers
- 📁 File names to avoid collisions
- 🔗 Message IDs in queues and event streams
- 🧪 Test identifiers kept isolated
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit identifier designed to be unique across the world. Version 4 is generated randomly.
Is the chance of collision zero?
It is essentially zero. To generate a v4 UUID collision, you would need to produce 1 billion per second for 85 years for a 50% probability.
Are the UUIDs cryptographically secure?
Yes. We use the browser's crypto.randomUUID(), which uses a secure entropy source. They are appropriate for database IDs, tokens and API keys.
What is the difference between UUID and GUID?
None technically. GUID (Globally Unique Identifier) is Microsoft's name; UUID is the RFC 4122 name. Same 128-bit format.
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