Which UUID version is this?

Version 4 (random). 122 bits of randomness — collisions are astronomically unlikely.

Is the random source secure?

Yes. `crypto.randomUUID()` uses the same CSPRNG as `crypto.getRandomValues()`, which the browser exposes for cryptographic use.

Can I generate v1/v5/v7 UUIDs?

Not yet — this tool only emits v4. Time-ordered v7 support is on the roadmap.

UUID generator

Generate one or more cryptographically random v4 UUIDs. Runs in your browser.

Runs in your browser Instant No signup, no tracking

How many? (default 1)

UUIDs

About this tool

Generate up to 100 v4 UUIDs at a time. UUIDs come from the browser's `crypto.randomUUID()`, which is backed by the same secure random source used for TLS keys — safe for identifiers, session tokens, and idempotency keys. Enter a count in the input field (leave blank for one). Everything runs client-side.

Example

Paste the input on the left and you will get output like this:

Sample How many? (default 1)

Resulting UUIDs

659d62ef-53e6-4012-805c-27ed0f70f61d
9ae81661-2eba-4731-ba2e-35e330cfa659
4fe5fdfd-2ffb-4de4-8d65-dbf58ae4e883
70fc5d36-4608-4e37-b682-1fe1fc17cb25
fc8d4405-b576-4658-9b71-960f32d25213

How to use UUID generator

Paste or type your How many? (default 1) into the left pane.
The UUIDs appears instantly in the right pane. Conversion runs in your browser — nothing is uploaded.
Copy the result to your clipboard or download it as a file.

FAQ

Which UUID version is this?: Version 4 (random). 122 bits of randomness — collisions are astronomically unlikely.
Is the random source secure?: Yes. `crypto.randomUUID()` uses the same CSPRNG as `crypto.getRandomValues()`, which the browser exposes for cryptographic use.
Can I generate v1/v5/v7 UUIDs?: Not yet — this tool only emits v4. Time-ordered v7 support is on the roadmap.