What is a UUID?
UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely label information in computer systems. Think of it as a digital fingerprint for data — each UUID is unique and generated without a central authority.
UUID Structure: A UUID is written as 32 hexadecimal digits separated by hyphens into 5 groups: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. The version variant is encoded in specific bit positions.
Common Use Cases
UUID Generator is a free online tool for generating v1, v3, v4, v5, and v7 UUIDs in bulk. Conforms to RFC 4122/9562. Runs entirely in your browser.
What is the UUID Generator?
UUID (Universally Unique Identifier) is a 128-bit identifier standard defined in RFC 4122 and RFC 9562. This tool generates UUID v4 (random) and v7 (time-ordered) in bulk. Use generated IDs as [Password](/password) seeds, encode them in [QR codes](/qrcode), or verify uniqueness with [Hashing](/hashing).
UUIDs are widely used as database primary keys, distributed system identifiers, and session tokens. With 2^122 possible values, collision probability is negligible.
Common Use Cases
Database primary keys — UUIDs avoid ID collisions in distributed databases without requiring a central coordinator.
Distributed system identifiers — generate unique IDs across multiple services, regions, or data centers with zero coordination.
Session tokens and request tracing — use UUIDs as correlation IDs that are guaranteed unique across your entire infrastructure.
How to Generate UUIDs
- 1
Select your UUID version
- 2
Set the quantity and format
- 3
Copy or download