UUID Generator
v4 UUIDs, bulk or single, copy in one click.
Free forever No signup Works offline
Live tool
0 UUIDs
The full guide
What is a UUID v4?
A UUID (Universally Unique Identifier) version 4 is a 128-bit random value formatted as 8-4-4-4-12 hex characters. Two random UUIDs colliding is so unlikely it's effectively impossible — you'd need to generate a billion UUIDs per second for ~85 years to get a single duplicate.
How we generate them
We use crypto.randomUUID() in your browser when available, falling back to crypto.getRandomValues(). Nothing is sent to a server — the UUIDs never leave your machine until you paste them somewhere.
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