Developer Tools

Free Online UUID Generator

Generate RFC 4122 version 4 UUIDs instantly — one at a time or in bulk — right in your browser.

How many?

Uppercase Remove hyphens

Result

How to use the uUID Generator

Choose how many UUIDs you need (up to 100 at once).
Optionally toggle uppercase or remove hyphens.
Click 'Generate UUIDs'.
Copy the full list to use in your code or database.

Example

Generating a single UUID might return 3f29b1a4-7c3d-4e1a-9b2f-8d6e2a1c4f0b — a 128-bit identifier virtually guaranteed to be unique.

Why generate UUIDs?

UUIDs (Universally Unique Identifiers) are used as database keys, session tokens, and object IDs because the chance of two randomly generated UUIDs colliding is astronomically small, with no central coordination needed.

Cryptographically random

This tool uses the browser's built-in crypto.getRandomValues() API to generate truly random UUID v4 values, not a weaker Math.random() fallback.

Frequently asked questions

What UUID version does this generate?

This tool generates version 4 (random) UUIDs, the most commonly used type for general-purpose unique identifiers.

How random are these UUIDs?

They're generated using the Web Crypto API's cryptographically secure random number generator, not Math.random().

Can I generate more than 100 at once?

The tool currently caps bulk generation at 100 per click to keep the page responsive; run it again for more.

Are UUIDs stored or logged anywhere?

No, generation happens entirely in your browser and nothing is sent to a server.