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Security & Cryptography

UUID v5 Generator

Generate a deterministic namespace UUID (version 5).

Free foreverRuns in your browserNo sign-up

UUID v5 is deterministic: the same name and namespace always produce the same UUID, computed with SHA-1 in your browser.

About the UUID v5 Generator

Generate a version 5 UUID, which is deterministic: the same name and namespace always produce the same UUID.

Pick a standard namespace (DNS, URL, OID, X.500) or provide your own, then enter a name.

The UUID is computed with SHA-1 in your browser, so nothing is uploaded.

Key features

  • Deterministic, name-based UUIDs
  • Standard DNS, URL, OID and X.500 namespaces
  • Custom namespace support
  • Copy the result instantly

How to use

  1. 1Choose a namespace or enter a custom one.
  2. 2Type the name to hash.
  3. 3Copy the generated UUID.

Examples

DNS namespace
Input: example.com in DNS
Output: cfbff0d1-9375-5685-968c-48ce8b15ae17

The same name and namespace always give this UUID.

Different namespace
Input: example.com in URL
Output: A different UUID

Changing the namespace changes the result.

Frequently asked questions

How is UUID v5 different from v4?
Version 4 is random, while version 5 is deterministic from a namespace and name, so the same inputs always give the same UUID.
What is a namespace?
A namespace is a fixed UUID that scopes your names, so the same name in different namespaces gives different UUIDs.
Is my data uploaded?
No. The UUID is computed entirely in your browser.

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