UUID Generator
Generate random version-4 UUIDs in bulk with a cryptographically secure generator. Copy individually or all at once — nothing leaves your browser.
- ✓ Runs in your browser — nothing uploaded
- ✓ No sign-up
- ✓ Free, no limits
This free UUID generator creates version-4 (random) UUIDs using your browser's built-in cryptographic randomness via the native crypto.randomUUID API — the same source production systems use, not a weak Math.random substitute. Choose how many you need, from one to a hundred, press Generate, and copy any single value or the whole list at once.
UUIDs (universally unique identifiers) are the standard way to label database rows, API requests, uploaded files, log events or test fixtures without a central counter. A version-4 UUID has 122 random bits, so the chance of two ever colliding is negligible even across billions of values generated on different machines — which is exactly why they are used for distributed IDs.
Generation happens entirely on your device; nothing is requested from or sent to a server, so it works offline and the values are yours alone. Worked example: each result matches the canonical 8-4-4-4-12 hexadecimal form with a “4” marking the version, such as 3f2504e0-4f89-41d3-9a0c-0305e82c3301. Need secure passwords or timestamps too? The related tools below cover those.
Frequently asked questions
What is a version-4 UUID?
A UUID generated from random data (122 random bits), identifiable by the “4” in the third group. It needs no coordination between machines, which is why it is the default for distributed identifiers.
Are these UUIDs truly random and safe to use as IDs?
Yes. They come from the browser's cryptographic random generator (crypto.randomUUID), so collisions are astronomically unlikely and they are suitable for database keys, request IDs and file names.
Is anything sent to a server?
No. UUIDs are generated locally in your browser and never transmitted — it works with no internet connection.