UUID Generator

Generate cryptographically random v4 UUIDs, one at a time or in bulk, ready to copy straight into your code or database seed.

Count

Output

Walkthrough

How to use it

Set how many UUIDs you want with the Count field (up to 1000 at a time).
Click Generate — a fresh batch of v4 UUIDs appears in the output pane, one per line.
Click Copy all to copy the entire list to your clipboard.
Click Generate again any time for a new batch; nothing is cached between runs.

Use cases

When you'd use this

Seeding a database or test fixtures. Generate a batch of realistic primary-key values for local development or test data without hitting your application's ID-generation code.

Naming temporary resources. Use a UUID as a unique, collision-free identifier for a temp file, a feature flag, or a one-off cloud resource.

Filling in a spec or example. Drop a placeholder UUID into API documentation or a config example without needing your app running.

FAQ

Common questions

What version of UUID does this generate?

Version 4 — randomly generated, using the Web Crypto API's cryptographically secure random number generator (crypto.getRandomValues), not Math.random().

Are these guaranteed unique?

Practically, yes. The chance of a collision among v4 UUIDs is astronomically small (roughly 1 in 2^122) even generating millions of them.

Is any of this sent to a server?

No — generation happens entirely client-side using your browser's built-in crypto module.

Can I generate UUID v1 or v7 instead?

Not currently — this tool focuses on v4, the most commonly used version for general-purpose unique IDs. See the blog post on v4 vs v7 for when the newer, sortable version is worth using instead.