Generate unique identifiers (UUID v1 & v4)

UUID Settings

UUID Version

Number of UUIDs

Format

Hyphens

Include Hyphens

Validate UUID

Generated UUIDs

Click "Generate" to create UUIDs

Generate universally unique identifiers (UUIDs) for your databases, APIs, and applications. Our tool supports UUID v1 (timestamp-based) and v4 (random). Generate single or bulk UUIDs, choose uppercase or lowercase format, and validate existing UUIDs.

How to Use

1Select UUID version: v1 (timestamp-based) or v4 (random)
2Choose format options: uppercase/lowercase, with or without hyphens
3Set the number of UUIDs to generate (1-100)
4Click 'Generate' to create your UUIDs
5Copy individual UUIDs or all at once

Frequently Asked Questions

What's the difference between UUID v1 and v4?

UUID v1 uses timestamp and MAC address, making it somewhat predictable but guaranteed unique. UUID v4 is completely random, offering better privacy but a tiny theoretical collision chance (1 in 5.3×10^36).

Are UUIDs globally unique?

Practically yes. The chance of generating duplicate UUID v4s is astronomically low—you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one collision.

Should I use UUIDs as database primary keys?

UUIDs work well for distributed systems where you can't coordinate ID generation. However, they're larger than integers and can impact index performance. Consider your use case and database type.

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