A UUID (Universally Unique Identifier) version 4 is a 128-bit cryptographically secure random number used to uniquely identify database primary keys, transactions, and resources without a central authority.

UUID v4 Generator

Generate cryptographically secure RFC 4122 UUID v4 strings and GUIDs in bulk.

Quantity:

Format:

Uppercase Strip Hyphens

Generated Identifiers

Cryptographically Secure UUID v4 Generator

UUID v4 uses 122 bits of pseudo-randomness generated via the browser's native crypto.getRandomValues() API, offering virtually 0% collision probability across millions of database keys and distributed transactions.

Frequently Asked Questions

Are the generated UUIDs cryptographically secure?

Yes. Identifiers are generated using the browser's native crypto.getRandomValues() API, which pulls entropy directly from your operating system's cryptographically secure pseudo-random number generator (CSPRNG).

What formats and options can I configure?

You can choose between RFC 4122 compliant UUID v4 or compact URL-friendly NanoIDs, toggle uppercase letters, strip hyphens, and generate batches of up to 500 identifiers in a single click.

What is the probability of a UUID collision?

With 122 bits of true entropy, the risk of a collision is virtually zero. Generating 1 billion UUIDs per second for 85 consecutive years yields less than a 50% probability of creating a duplicate.