$ uuid

UUID Generator

Generate cryptographically random v4 UUIDs in bulk, with options for uppercase, braces and no hyphens.

Count Uppercase No hyphens Braces

UUIDs

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About UUID v4

A version 4 UUID is 128 bits, of which 122 are random, giving roughly 5.3 × 10³⁶ possible values. Collisions are not a practical concern. This tool uses the browser crypto.randomUUID() API, which draws from a cryptographically secure source — safe for database keys, API tokens and session identifiers.

Other versions

v1 embeds a timestamp and MAC address; v5 hashes a namespace and name deterministically; v7 (newer) is time-ordered, which indexes well in databases.