UUID, ULID & ID Generator
Every ID format in one place — copy one with a click or download a million as JSON, CSV or SQL. Cryptographically random.
Help shape UUID, ULID & ID Generator
The bug you just noticed will fade in 3 minutes. The feature idea will vanish after your next tab switch. Crazy peps don't suffer silently.
Frequently Asked Questions
Use v7 for database primary keys: it starts with a timestamp, so new rows land at the end of the index instead of randomly, which keeps inserts fast. Use v4 when IDs must not reveal when they were created.
Yes. They use crypto.getRandomValues, the browser's cryptographically secure generator — the same source as crypto.randomUUID().
Practically never. With 122 random bits you'd need about 2.7 quintillion v4 UUIDs for a 50% chance of one duplicate. The tool shows the odds for each format.
None in practice — GUID is Microsoft's name for a UUID. The only quirk is that Windows stores the first three fields little-endian; the inspector shows that byte order too.
No. IDs are generated in your browser and never leave it.