The UUID tool generates two kinds of random identifier, UUID v4 and nanoid, in runs of 1 to 1,000. A UUID comes from the browser's crypto.randomUUID() where that API exists; without it, 16 bytes are taken from crypto.getRandomValues() and the v4 version bits and the RFC variant bits are set by hand.

1. 01Choose UUID v4 or nanoid.
2. 02Set how many to generate; for nanoid you can also set a length between 4 and 64 characters.
3. 03UUIDs can be uppercased or stripped of hyphens; nanoids can be uppercased.
4. 04Changing a setting regenerates the list automatically, and there is a manual “Regenerate” button; finish by copying the result or downloading it as TXT.

• 1,000 per run is the ceiling; the page does not check for collisions inside or across batches, because the design relies on a large enough random space.
• The UUID fallback path still uses Web Crypto and never drops back to Math.random().
• Removing hyphens does not change a UUID's random bits, it only deletes the - characters in the text; uppercasing is likewise a presentation change.
• nanoid length runs from 4 to 64, and the result is not a UUID and carries no version or variant meaning.
• The tool only generates IDs: it does not register them, look them up, or promise that they are unique in your database.

Generation happens entirely in the browser, with no input uploaded and no remote generation endpoint.