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UUID Generator

Options
Version
Choose UUID version
Count
How many UUIDs to generate (1–100)
Format

About the UUID Generator

Create RFC 4122 compliant UUIDs in your browser. Generate random v4 IDs or name-based v5 IDs derived from a namespace and name. Output can be uppercase and without hyphens for systems that prefer compact tokens.

How to use

  • Select the version (v4 for random IDs; v5 for deterministic, name-based IDs).
  • Set how many IDs you need and adjust formatting options.
  • For v5, enter a name and pick a predefined namespace (DNS/URL/OID/X.500) or paste a custom namespace UUID.
  • Click Generate, then copy the results.

Notes

  • v4 uses cryptographic randomness available in modern browsers.
  • v5 is deterministic: the same namespace + name always produces the same UUID.
  • Standard namespaces: DNS, URL, OID, and X.500 (per RFC 4122).

Examples

v5 with DNS namespace and name example.com yields a stable ID you can reproduce across systems. v4 is best when you just need unique random identifiers with no input.