UUID Generator

How to use the UUID Generator

1. Click the generate button to create a new UUID v4.
2. To generate multiple UUIDs at once, set the desired quantity and click the bulk generate button.
3. Click the copy button to copy the UUID or list of UUIDs to your clipboard.
4. Optionally, download your generated UUIDs as a text file for easy storage or sharing.

How unlikely is a collision, really?

With UUID v4, the collision probability is astronomically low. Generating a billion UUIDs per second for about 85 years gives roughly a 50% chance of a single collision, which is a purely theoretical concern for essentially every real-world application. This is why UUIDs are trusted as primary keys in distributed databases where multiple servers generate IDs independently without coordinating with each other. The odds of two servers ever producing the same value are close enough to zero to ignore in practice.

Frequently asked questions

What's the difference between UUID versions (v1, v4, v5, etc.)?

v1 is time-and-machine-based (can leak information about when/where it was generated); v4 is purely random (what this tool generates, and the most common general-purpose choice); v5 is deterministic, generated from a namespace and name so the same input always produces the same UUID. Useful when you need a consistent ID derived from existing data.

Can I generate UUIDs in bulk?

Yes, generate as many as you need in one batch and copy or download the full list.

Are these UUIDs cryptographically secure?

v4 UUIDs use random or pseudo-random bits, but not every implementation uses a cryptographically secure random source. For security-sensitive tokens (session IDs, API keys) rather than general-purpose unique identifiers, use a purpose-built secure token generator instead.