Free Online Tool

UUID Generator (v4)

Free UUID v4 generator. Generate random UUIDs in bulk and copy one or many with a single click. No signup needed, runs entirely in your browser.

What is this tool?

A UUID (Universally Unique Identifier) is a 128-bit identifier that's practically guaranteed to be unique across all space and time. UUID v4 uses random generation, making collisions virtually impossible.

Why use this tool?

UUIDs are essential for database primary keys, API request tracking, session IDs, and distributed systems. Our generator creates cryptographically random v4 UUIDs with proper formatting.

Tips & Best Practices

  • UUID v4 has 2^122 possible values — collision is practically impossible
  • Use for database IDs to prevent enumeration attacks
  • Generate in bulk for batch operations
  • Standard format: 8-4-4-4-12 hex characters

Frequently Asked Questions

Can two UUIDs ever be the same?

Theoretically yes, but the probability is so low it's effectively zero. You'd need to generate 2.71 quintillion UUIDs to have a 50% chance of one collision.

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