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UUID Generator

Cryptographically secure UUID v4s — single or a thousand at a time, formatted your way.

🔒 Generated with your browser's crypto engine — never sent anywhere

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What makes a UUID v4 special?

A version-4 UUID packs 122 random bits — enough that you could generate a billion per second for decades without a realistic chance of collision. That's why they're the default choice for database primary keys, API request IDs, file names and distributed systems where two machines must never mint the same identifier. This tool uses the browser's cryptographically secure random source (the same quality used for encryption keys), not a predictable pseudo-random generator.

FAQ

Can two generated UUIDs ever collide?
Theoretically yes, practically no — with 122 random bits, the odds are so small that duplicate UUIDs are treated as impossible in real systems.
What's the "4" and the "8/9/a/b" in every UUID?
The 13th hex digit is always 4 (the version), and the 17th is 8, 9, a or b (the variant) — that's part of the UUID standard, not a coincidence.
Are these safe to use as secret tokens?
They're generated securely, but UUIDs are identifiers, not passwords — for secrets, use our Password Generator with 20+ characters instead.

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