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How to Generate a UUID (v4)

Generate a random UUID (v4) instantly in your browser — step by step, with a free UUID generator.

A UUID is a 128-bit unique identifier. Generating a random version-4 UUID takes a second:

  1. 1

    Open the UUID generator

    Open the UUID generator tool.

  2. 2

    Generate

    A version-4 (random) UUID is produced instantly. Generate as many as you need.

  3. 3

    Copy it

    Copy the UUID and paste it into your code, database or config.

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UUID Generator

Generate UUIDs online — v1, v4, v7, and Nil. Bulk generation up to 10,000. Free, no signup.

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Password Generator

Generate strong, cryptographically random passwords. Configurable length and character sets — runs in your browser.

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Random JSON Generator

Generate fake JSON from a schema using faker.js. Multi-output: JSON, CSV, TSV, XML. Free, runs in your browser.

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Frequently asked questions

Which UUID version should I use?

Version 4 (random) is the default for most uses — database keys, request IDs. Use v5/v7 only if you need namespace- or time-ordered IDs.