UUID Generator

Generate universally unique identifiers (UUIDs) with a single click.

About this tool

UUIDs (universally unique identifiers) are 128-bit values used as unique IDs for database rows, distributed system keys, and session tokens — designed so independently generated IDs essentially never collide, without needing a central authority to hand them out.

How to use it

1. Choose a version — v4 (random) or v1 (timestamp-based).
2. Click Generate UUID to add one to the list.
3. Copy any individual UUID, or generate several at once for seeding test data.

FAQ

Which version should I use?

v4 (random) is the standard choice for almost everything — database primary keys, API tokens, request IDs. v1 (timestamp-based) is useful when you specifically want IDs that sort roughly by creation time.

Are UUIDs guaranteed to be unique?

Not mathematically guaranteed, but the collision probability for v4 UUIDs is astronomically small — you'd need to generate billions of them per second for centuries before a collision became likely.

Is a v4 UUID safe to use as a security token?

v4 UUIDs use a cryptographically random source in modern browsers (crypto.randomUUID), so they're reasonable as unguessable identifiers, though a purpose-built token generator is still preferable for authentication secrets.