UUID Generator produces version 4 (random) UUIDs using the browser's built-in crypto.randomUUID() API. Generate 1, 5, 10, or 50 UUIDs at a time, copy them individually or all at once, and regenerate whenever you need a fresh set.
UUID v4 is randomly generated with no dependency on MAC addresses, timestamps, or other identifying information, making it the most privacy-friendly and widely supported variant for general-purpose unique identifiers.
UUID v4 has 122 bits of randomness, giving a collision probability of roughly 1 in 5 undecillion for any two randomly generated UUIDs — for all practical purposes, they are unique.
GUID (Globally Unique Identifier) is Microsoft's term for the same concept as UUID. They follow the same format and are interchangeable in practice.
Yes, UUID v4 is commonly used as a primary key when you want IDs that can be generated client-side without coordination, though they take more storage than auto-incrementing integers and can fragment certain database indexes.
crypto.randomUUID() uses the operating system's cryptographically secure random number generator, whereas Math.random() is not cryptographically secure and can be predictable in some implementations.
The current version offers presets of 1, 5, 10, or 50. For larger batches, generate multiple sets and combine them, or use a script with crypto.randomUUID() in a loop.
Standard 36-character format with hyphens, e.g. xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where the version (4) and variant bits are fixed per the UUID v4 specification.
