UUID v5 Generator Online (Namespace, SHA-1)
Generate a deterministic UUID v5 from a namespace and a name (SHA-1), in your browser.
Deterministic: the same namespace + name always yields the same UUID. Computed locally (SHA-1).
🔒 100% client-side — no data sent
Generate a deterministic UUID v5 from a namespace and a name using the SHA-1 algorithm. The same namespace and name pair always produces the same identifier, ideal for reproducible keys. Generation runs 100% in your browser with no data upload.
What is it for?
- ▸ Create reproducible identifiers for database records
- ▸ Generate stable keys from URLs or domain names
- ▸ Deduplicate entities by deriving the same UUID from a source
- ▸ Produce deterministic identifiers for automated tests
FAQ
What is the difference between UUID v4 and UUID v5?
A UUID v4 is random, whereas a UUID v5 is deterministic: it is computed from a namespace and a name using SHA-1 and stays identical for the same inputs.
What is a namespace for a UUID v5?
The namespace is a reference UUID (for example for URLs or DNS) that, combined with the name, ensures the uniqueness of the generated identifier.
Is a UUID v5 always the same for the same inputs?
Yes, that is the deterministic principle of UUID v5: the same namespace and name always produce the same UUID.