A Universally Unique Identifier — a 128-bit number formatted as 32 hex digits in 5 groups (e.g., 550e8400-e29b-41d4-a716-446655440000).

What version does this generate?

UUID v4 (random), which uses cryptographic randomness. The probability of collision is astronomically low.

Can I use UUIDs as database primary keys?

Yes — UUIDs are commonly used in distributed systems where auto-increment IDs aren't practical.

Statistically yes. With 2^122 possible v4 UUIDs, you'd need to generate 1 billion per second for 86 years to have a 50% chance of one collision.

Generate random UUIDs (v4) for unique identifiers. Runs in your browser. Completely private.

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How useful is UUID Generator?

Click "Generate" to create a new UUID v4

Generate multiple UUIDs at once by setting the batch size

Copy individual UUIDs or the entire batch

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Decode and inspect JSON Web Tokens.

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Generate HMAC signatures for message authentication.