UUID stands for Universally Unique Identifier — a 128-bit number formatted as 32 hexadecimal digits in five groups (e.g., 550e8400-e29b-41d4-a716-446655440000). UUID v4 is randomly generated and has approximately 5.3 × 10³⁶ possible values, making collisions practically impossible.

What is the difference between UUID and GUID?

They are essentially the same thing. GUID (Globally Unique Identifier) is Microsoft's term for the same standard. Both refer to a 128-bit identifier. The format and generation methods are identical.

Are these UUIDs truly unique?

UUID v4 values are randomly generated using your browser's cryptographically secure random number generator (Web Crypto API). The probability of generating two identical UUIDs is approximately 1 in 2¹²² — so small that it's effectively impossible in practice.

Can I use these UUIDs as database primary keys?

Yes. UUID v4 is widely used as primary keys in databases like PostgreSQL, MySQL, and MongoDB. They have the advantage of being globally unique without a central sequence generator, making them ideal for distributed systems.

Is this safe? Are UUIDs sent to a server?

No data is sent anywhere. All UUID generation happens locally in your browser using the built-in crypto.randomUUID() Web Crypto API. Nothing is tracked or stored.

UUID Generator

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Generate random UUID v4 identifiers instantly.

How many? (1–10)

Click Generate to create UUIDs

Uses your browser's Web Crypto API — never sent anywhere

How to use UUID Generator

1Select how many UUIDs you want to generate (1, 2, 3, 5, or 10).
2Click the Generate button.
3Click Copy next to any UUID to copy it individually.
4Use "Copy all" to copy all generated UUIDs to your clipboard at once.
5Click Generate again to get a fresh set of UUIDs.

Frequently Asked Questions

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Universally Unique Identifier — Wikipedia

History, format, and versions of the UUID standard

RFC 4122 — UUID Standard

The official IETF specification for UUIDs

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