UUID Generator
This free UUID generator produces random version-4 UUIDs in bulk, right in your browser.
How to use
- Set how many UUIDs you need — any count from 1 to 100.
- Press Generate; each identifier is produced with cryptographic randomness (UUID v4).
- Copy the whole list with one click, or download it as a .txt file with one UUID per line.
Frequently asked questions
What is a UUID v4?
A version-4 UUID is an identifier built almost entirely from random bits, formatted as 8-4-4-4-12 hex digits. The RFC fixes the version nibble (4) and the variant bits, leaving 122 random bits — about 5.3 × 10^36 combinations — which makes accidental collisions effectively impossible.
Can two generated UUIDs ever collide?
Theoretically yes, practically no. You would need to generate billions of UUIDs for even a one-in-a-billion chance of a single collision. Teams rely on this daily: databases, distributed systems and test suites generate identifiers independently with no coordination.
How are the UUIDs generated here?
With crypto.randomUUID(), the browser platform cryptographic random generator — the same quality of randomness your operating system exposes to native apps. This is not Math.random(): the output is suitable for identifiers and unguessable tokens.
Are generated UUIDs safe as unguessable secrets?
A v4 UUID with proper cryptographic randomness is unguessable in practice, but treat it as one layer: for sessions and API keys, generate secrets dedicated to the purpose and store them hashed. Never reuse an identifier that was displayed in a log or a shareable page as a secret.
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About this tool
This free UUID generator produces random version-4 UUIDs in bulk, right in your browser. A UUID v4 is a 122-bit random value dressed in the standard 8-4-4-4-12 hexadecimal format — like 3b241101-e2bb-4255-8caf-4136c566a962 — with the version and variant bits fixed by the RFC, giving roughly 5.3 × 10^36 possibilities. Collision odds are so negligible that team members can generate identifiers independently, offline, without a central coordinator: database primary keys, distributed tracing IDs, idempotency keys, test fixtures, file names that must never clash. Choose a count between 1 and 100, press generate, and copy the whole batch with one click or download it as a plain .txt file, one UUID per line. The identifiers are produced by your browser platform with crypto.randomUUID(), the same cryptographic randomness your operating system exposes to native applications — never a predictable pseudo-random shortcut. Everything runs locally: nothing is transmitted, stored or logged. Pick a count below and generate.