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RFC 4122 UUID v4 Generator

Online UUID v4 generator using Web Crypto, RFC 4122 compliant. Bulk generate 1–100 at once with options for case and hyphenation.

Click 'Generate' to start

Usage

A UUID (Universally Unique Identifier) is a 128-bit identifier commonly used as database primary keys or distributed-system IDs.

Uses the browser's crypto.randomUUID() to produce RFC 4122 compliant v4 (random) UUIDs — up to 100 at a time.

Use cases

Database primary keys

Avoid leaking business volume via auto-increment IDs, and work without a central ID service.

Cross-system correlation IDs

A single UUID propagated across services makes distributed tracing easier.

File / upload naming

Avoid filename collisions in object storage.

Idempotency tokens

Pre-generate a UUID on the client as a request ID; the server uses it to deduplicate.

FAQ

Are UUID v4s really unique?

Mathematically there is a tiny collision chance, but it would take a billion per second for 100 years to reach a 50% chance — effectively unique.

Difference between v4, v1 and v7?

v1 uses MAC + timestamp; v4 is fully random; v7 is timestamp-based and sortable. This tool generates v4.

Can I get them without dashes?

Yes — toggle the plain format for 32 contiguous hex characters.

Upper or lower case?

RFC 4122 recommends lowercase but most systems accept both. The tool can switch on the fly.

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