Tech & Security

UUID Generator

Generate random UUID version 4 identifiers for database primary keys, request IDs and distributed system testing.

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How UUIDs Are Generated

UUID version 4 (random) is generated using the browser's crypto.randomUUID() API where available, falling back to a Math.random()-based implementation. The format is: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is a random hexadecimal digit and y is one of 8, 9, a or b.

The collision probability of two random UUIDs is astronomically low (1 in 5.3 × 1036), making them suitable for use as unique identifiers in test databases.

Frequently Asked Questions

UUID version 4 (randomly generated). This is the most commonly used UUID version for application identifiers.

Yes. The generator uses crypto.randomUUID() where available, which uses the browser's cryptographically secure random number generator.

Yes. UUID v4 is widely used as a primary key type in PostgreSQL, MySQL, MongoDB and other databases.

Standard UUID format: 8-4-4-4-12 hexadecimal characters separated by hyphens. Example: 550e8400-e29b-41d4-a716-446655440000.

Yes. Generate up to 1,000 UUIDs and export to CSV or JSON.

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