Developer utilities

UUID Generator

Generate one or many random version-4 UUIDs using your browser cryptographic RNG. Uppercase and no-hyphen options. Free.

Generate UUIDs

Create cryptographically-random version 4 UUIDs.

What this UUID generator does

Generates version 4 (random) UUIDs
Uses the browser crypto API
Batch up to 500 at once
Optional uppercase and no-hyphen forms
Copy the whole list
Runs entirely in your browser

Common use cases

  1. 1Creating unique record IDs
  2. 2Seeding test data
  3. 3Generating API keys or tokens
  4. 4Naming resources uniquely
  5. 5Idempotency keys
  6. 6Correlation IDs for logs

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About UUIDs

A UUID (Universally Unique Identifier) is a 128-bit value used as a unique ID without a central authority. Version 4 UUIDs are almost entirely random — the odds of a collision are negligible — which makes them ideal for database keys, tokens and resource names.

This generator uses the browser's cryptographic random source (crypto.randomUUID), so the values are high-quality and generated entirely on your device. Nothing is sent anywhere.

More Free Tools Where This Came From

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FREQUENTLY ASKED QUESTIONS

Got Questions? We Have Answers.

Which UUID version is this?

Version 4 — random UUIDs generated with the browser cryptographic random source (crypto.randomUUID), so they are unpredictable.

Can I generate many at once?

Yes. Choose how many you need and the tool generates them all, ready to copy.

Are they unique?

Version-4 UUIDs have 122 random bits, so collisions are astronomically unlikely — safe as unique identifiers.

Are they generated locally?

Yes. Everything runs in your browser; no UUID is ever sent to a server.