UUID Generator

100% Free · Client-Side

Generate single or bulk RFC 4122 Version 4 UUIDs instantly. Customize casing and hyphenation for your development needs.

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Understanding UUID V4

A Universally Unique Identifier (UUID) is a 128-bit number used to uniquely identify information in computer systems. Version 4 UUIDs are primarily based on random numbers, providing an extremely high probability of uniqueness without needing central registration.

Cryptographic Randomness

Our generator uses the browser's crypto.randomUUID() API, which relies on a cryptographically strong random number generator (CSPRNG). Safely use these for databases and API keys.

Developer Formatting

Whether you need lowercase strings for database keys or uppercase hex for legacy systems, our tool offers direct controls for hyphens and casing.

Frequently Asked Questions

1. Can UUIDs collide?

While theoretically possible, the chance of two UUIDs being the same is astronomical. There are approximately 3.4 x 10³⁸ possible UUIDs. You would need to generate 1 billion UUIDs every second for 100 years to have a 50% chance of a single collision.

2. Is this generator offline-first?

Yes. Once the page is loaded, the generation logic runs entirely in your browser's memory. It does not communicate with any external backend, making it fast and secure.

3. When should I use 'No Hyphens' mode?

Removing hyphens is helpful when you need more compact storage or when using UUIDs in environments that don't allow certain special characters in identifiers.

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