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UUID v4 generator

Generate a bounded batch of version-4 UUIDs using Web Crypto in your browser.

Processing is local with no automatic storage. Worker deadline: 5 seconds; complete result including details: 2 MiB. Preview is bounded; copy and download are complete.

UUID version 4 using Web Crypto randomness, 1–1,000 identifiers. No automatic copying and no absolute collision-free guarantee.

How to use

Choose the identifier count and generate. Review the result count and format, then copy or download the complete list. Generating another batch produces new random values.

Try an example

550e8400-e29b-41d4-a716-446655440000 is a fixed format example: 4 identifies the version and a has the required variant bits. Choosing 3 produces three lines; generated values are not expected to match the example.

Support & limits

Version 4 follows RFC 9562 using Web Crypto randomness with fixed version and variant bits; it does not use Math.random, timestamps or personal data. Output is lowercase with LF between identifiers and no final LF. Missing cryptographic support causes an error. Collision freedom is not guaranteed.

Common questions

Is a UUID a password or an absolute uniqueness guarantee?

This tool is not presented as a password generator, and collisions are theoretically possible. An application requiring enforced uniqueness must check it when storing identifiers.

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