UUID v1/v3/v4/v5 Generator

Create UUID v1 (time-based), v3/v5 (namespace + name), or v4 (random). Generate in bulk and copy instantly.

Recommended
Note: v1 can leak timestamp and node-ish info. v4 is the usual safe default.
UUIDs0
UUIDs will appear here after generation.

FAQ

Quick answers about UUID versions and usage.

What's v1/v3/v4/v5?

v1 is time-based, v4 is random, v3 is deterministic with namespace + name (MD5), and v5 is deterministic with namespace + name (SHA-1).

Which should I use?

Most users should pick v4. Use v3/v5 when you need repeatable IDs from a namespace and name, and v1 only if you specifically need time-based ordering.

Are UUIDs secure?

UUIDs are identifiers, not secrets. Avoid using them as authentication tokens; v4 is generally safe for uniqueness but not a replacement for cryptographic secrets.