UUID Generator

Version 4, the random kind. Out of 128 bits, six are fixed to mark the version and variant, and the remaining 122 come from a cryptographically secure random source.

Functionally yes. GUID is Microsoft's historical name for the same 128-bit identifier format, so tools and databases treat the two labels interchangeably.

With 122 random bits there are about 5.3 undecillion possible values. You'd need to generate billions per second for decades before a duplicate becomes a realistic concern.

Yes, it produces up to 1,000 identifiers per click, and you can regenerate as many batches as you need. Copy all gives you a newline-separated list that pastes cleanly into scripts and spreadsheets.

No. Generation runs locally through the Web Crypto API, so nothing is sent to a server, logged, or reused. Refreshing the page discards everything.

That digit is the version marker. The first character of the third group is always 4 in a v4 identifier, and the first character of the fourth group is always 8, 9, a, or b, which encodes the variant.

They work well when inserts come from many uncoordinated sources. The tradeoff is that random keys don't sort by creation time and can fragment indexes, so measure before committing to them on very hot tables.

Yes. Each value is a version 4 UUID from crypto.randomUUID(), so as a unique id generator for api records, requests, or idempotency keys, collisions aren't a practical worry even across independent servers. Set the count and click Generate.

Instantly. As a unique id generator it produces a fresh value on every click, and unique id generate for a whole batch, up to 1,000 at once, is a single press of Generate. Copy one row or use Copy all for the lot.

It's a free uuid generator with no sign up and no cap up to 1,000 per click. To generate v4 uuid online it uses the Web Crypto API, the same cryptographically strong source production code uses, so the randomness is real rather than seeded from a timestamp.