Universal unique identifiers. 2¹²² possibilities. The odds of collision are less than being hit by a meteorite while winning the lottery.
Generate UUID v4 (Random)
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UUID v4 uses 122 random bits from crypto.getRandomValues(). Version nibble = 4, variant bits = 10xx. Standardized in RFC 4122. Used everywhere: databases, APIs, distributed systems.
Bulk Generator
Validate & Parse
UUID v1-like (Timestamp)
Browser-generated v1-like UUID using current timestamp + random node. Not a true v1 (no MAC address access in browsers).
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UUID v1 encodes a 60-bit timestamp (100ns intervals since Oct 15, 1582), a 14-bit clock sequence, and a 48-bit node ID (typically MAC address). Reveals creation time and machine identity — a privacy concern that led to v4's popularity.