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UUID / GUID Generator

Generate cryptographically random Version 4 UUIDs (Universally Unique Identifiers). Uses the browser's native crypto.randomUUID() API.

Single UUID
Bulk Generate

        
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UUID Anatomy

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

The 4 marks this as version 4. The y is always 8, 9, a, or b (variant bits).

A v4 UUID contains 122 random bits — the probability of collision is astronomically low.

What is a UUID / GUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier), is a 128-bit label used to uniquely identify objects in software. It's typically represented as 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

Version 4 UUIDs

Version 4 UUIDs are generated using random or pseudo-random numbers. With 122 random bits, the probability of generating two identical UUIDs is approximately 1 in 5.3 × 10³⁶ — for all practical purposes, every UUID is unique.

Common use cases