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UUID Generator

Generate universally unique identifiers - random v4 or time-based v1 - one at a time or in bulk, with copy buttons per line. No sign-up, free.

Options
Version
Result
    Runs 100% in your browser No length or usage limits Free, no sign-up

    How to generate UUIDs

    Pick the version

    v4 is fully random and the right default. v1 encodes the current timestamp, useful when identifiers should sort by creation time.

    Set the count

    Generate up to 100 at once for seeding databases or test fixtures.

    Copy what you need

    Copy individual UUIDs or the whole list with one click.

    UUID questions, answered

    v4 or v1 - which should I use?

    v4 unless you have a reason: it is random, reveals nothing, and collision odds are astronomically small. v1 embeds a timestamp so IDs sort chronologically - but that also means they leak creation time.

    Can two generated UUIDs collide?

    With v4, the probability is about 1 in 2¹²² per pair - you could generate a billion per second for centuries without a collision.

    Are these real, standards-compliant UUIDs?

    Yes - RFC 4122 layout with correct version and variant bits, generated from cryptographic randomness in your browser.

    Is anything logged?

    No. Generation happens locally; no server ever sees the identifiers you create.

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