Pick a namespace
Use a standard RFC 4122 namespace, or paste your own custom namespace UUID.
UUID v5 Generator
Generate a namespace-based UUID version 5 from a name and namespace. The same inputs always produce the same UUID — computed locally in your browser.
UUID v5
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How it works
Enter a name
Type the string you want to derive a UUID from, like a domain or identifier.
Get a stable UUID
The same namespace and name will always generate the exact same UUID.
FAQ
How is UUID v5 different from UUID v4?
UUID v4 is random. UUID v5 is deterministic: it's derived from a namespace UUID and a name using SHA-1, so the same namespace and name always produce the same UUID.
What are the standard namespaces for?
RFC 4122 defines standard namespace UUIDs for DNS names, URLs, ISO OIDs and X.500 names, which let different systems generate the same UUID for the same input independently.
Is my name or namespace sent to a server?
No. The SHA-1 hashing and UUID construction happen entirely in your browser using JavaScript.