UUID UUID Generator

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UUID v5 Generator

Create version-5 UUIDs from a name and a namespace using SHA-1. Like v3, v5 is deterministic — the same inputs always produce the same UUID — but uses a stronger hash.

  • Name-based v5 (RFC 4122)
  • SHA-1 hashing
  • Deterministic output

UUID v5 Generator

v5
Between 1 and 1000.
Formatting

Result 0

    Generated locally with the Web Crypto API — nothing leaves your browser. Shortcut: Ctrl + Enter — Regenerated

    What is a UUID v5 Generator

    A UUID v5 hashes a namespace UUID with a name using SHA-1, then sets the version and variant bits. The same namespace + name always yields the same UUID, just like v3 — but with SHA-1 instead of MD5.

    This page uses the DNS namespace with the name example.com by default. SHA-1 (160 bits) is stronger than the MD5 (128 bits) used by v3, so v5 is the recommended name-based version in modern systems.

    How to

    1. Set how many UUIDs you need.
    2. Toggle uppercase, hyphens and braces as needed.
    3. Press Generate to compute the deterministic v5 value(s).

    Use cases

    • Stable IDs from canonical names (domains, emails, URLs).
    • Reproducible keys across services that share a naming scheme.
    • Replacing auto-increment IDs with content-derived identifiers.

    Compare UUID v5 Generator with other formats

    OptionWhen to use
    UUID v5SHA-1 name-based; deterministic, recommended
    UUID v3MD5 name-based; deterministic, legacy
    UUID v4Random; not reproducible

    Code examples

    JavaScript

    const { v5, v5: ns } = require('uuid');
const id = v5(ns.DNS, 'example.com');

    Python

    import uuid
id = uuid.uuid5(uuid.NAMESPACE_DNS, 'example.com')

    Frequently asked questions

    When should I use v5 instead of v3?

    Almost always prefer v5. It uses SHA-1, which is the modern recommendation for name-based UUIDs; v3 exists mainly for compatibility with older systems.

    Is v5 reproducible?

    Yes — given the same namespace and name it always returns the identical UUID, which is exactly why it is used for stable cross-system references.

    Does the output reveal the name?

    No. The hash is one-way: you cannot recover the original name from the UUID, only verify a candidate name produces the same value.