UUID / GUID Generator
Bulk-generate cryptographically random v4 UUIDs. Choose uppercase, hyphenless, or braced formats and copy them all with one click.
About UUID / GUID Generator
A UUID (universally unique identifier), also called a GUID, is a 128-bit value used as a collision-resistant identifier for database rows, API keys, files, and events. Version 4 UUIDs are generated from random data, so you can create them anywhere without coordinating with a central authority. This generator uses the browser's cryptographic random source and can produce them in bulk.
Frequently asked questions
Are these UUIDs really unique?+
Practically, yes. A v4 UUID has 122 random bits — you'd need to generate billions per second for decades before a collision became likely.
Are they cryptographically secure?+
They're generated with crypto.randomUUID / getRandomValues, which use a cryptographically strong random source. They're still identifiers, not secrets, so don't use a UUID as a password.
What's the difference between UUID and GUID?+
None meaningful — GUID is Microsoft's name for the same standard. The braced, uppercase format is just the style common in the Windows/.NET world.