Is this UUID generator secure?

Yes. This generator uses window.crypto.getRandomValues (Web Crypto API) to generate cryptographically secure random bytes for UUID version 4, ensuring high randomness and zero collision potential. No data is sent to a server.

What is the difference between UUID v1 and v4?

UUID v4 is completely generated from random (or pseudo-random) numbers. UUID v1 is generated using a combination of the host network address (MAC address) and the current timestamp, making it time-ordered.

Bulk UUID & GUID Generator

Generate single or bulk cryptographically secure UUID v4 or time-based UUID v1 values completely locally.

Generator Options

UUID Version

Version 4 (Random) Version 1 (Time-based)

Quantity to Generate

Casing

lowercase UPPERCASE

Format

Include Hyphens Wrap in curly braces { }

Separator

Prefix (Optional)

Suffix (Optional)

Generated Identifiers

Generated: 0 IDs Entropy: Cryptographically secure (CSPRNG)

Frequently Asked Questions

What is a UUID / GUID?

A Universally Unique Identifier (UUID), also known as a Globally Unique Identifier (GUID) in the Microsoft ecosystem, is a 128-bit label used for information in computer systems. Standard format consists of 32 hexadecimal digits separated by four hyphens.

How does Version 4 generator work?

UUID Version 4 relies entirely on random bits. Out of the 128 bits, 6 bits are reserved for version and variant metadata, leaving 122 bits of pure randomness. The probability of generating duplicates is mathematically negligible.

Are these UUIDs generated on the server?

No. All generations occur directly in your browser using secure client-side JavaScript calculations. This ensures complete privacy and zero data leakage.

Can these be used for databases?

Yes, they are standard RFC 4122 compliant identifiers, perfect for primary keys in Postgres, MySQL, MongoDB, or for session identifiers, tracking tokens, and API keys.