UUID Generator

Generate random UUIDs (v4)

Generate Single UUID

Generated UUID:

Generate Multiple UUIDs

Number of UUIDs (1-1000):

Generate multiple UUIDs at once

Generated UUIDs:

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. UUIDs are standardized by RFC 4122 and are practically guaranteed to be unique across all systems and time.

How to Use

Click "Generate UUID" for a single UUID
Or enter a count and click "Generate Multiple" for bulk generation
Copy the generated UUID(s) using the copy buttons

UUID Format

UUIDs are displayed in the standard format with 5 groups separated by hyphens:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Example:

550e8400-e29b-41d4-a716-446655440000

Common Use Cases

Database primary keys and unique identifiers
Session IDs and tracking tokens
File names and resource identifiers
API request IDs and correlation IDs
Distributed system identifiers

UUID Version 4

This tool generates UUID version 4, which uses random numbers. The '4' in the third group indicates the version, and the 'y' position contains variant information. This ensures compatibility with the UUID standard.

Frequently Asked Questions

Are UUIDs truly unique?

While not mathematically guaranteed, the probability of generating duplicate UUIDs is astronomically low (approximately 1 in 2^122). For practical purposes, UUIDs can be considered unique.

What's the difference between UUID versions?

UUID v4 (generated by this tool) uses random numbers. UUID v1 uses timestamps and MAC addresses. UUID v4 is preferred for most applications because it doesn't leak information about when or where it was generated.

Can I use UUIDs as database primary keys?

Yes! UUIDs are commonly used as primary keys, especially in distributed systems. However, be aware that they're larger than integer IDs and may impact index performance in very large databases.

Are the generated UUIDs cryptographically secure?

Yes, this tool uses the browser's crypto.randomUUID() or crypto.getRandomValues() API, which provides cryptographically secure random numbers.