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UUID Generator Online — v4, Free

Generate RFC 4122 compliant UUID v4 strings for use in databases and applications. Supports bulk generation, uppercase, and no-hyphens format.

Cryptographically random UUID

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About UUID v4

  • UUID v4 uses cryptographic randomness — collision probability is astronomically low for all practical purposes.
  • Used as primary keys in databases, session tokens, and distributed systems where no central ID authority exists.
  • The format is xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx — the 4 indicates version, and y encodes the variant.
  • UUIDs are case-insensitive — A1B2-... and a1b2-... represent the same value.
  • All generation happens in the browser using the Web Crypto API — nothing is sent to a server.

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