Generate one or many random UUID v4 identifiers with cryptographic randomness.
A UUID (Universally Unique Identifier) is a 128-bit identifier designed so that anyone can generate one at any time without coordinating with anyone else — and still be practically certain it is unique. Version 4, generated here, fills 122 of those bits with random data: the number of possible values is so large (about 5.3 undecillion) that the chance of two random UUIDs colliding is negligible for any real-world system.
UUIDs are the standard answer whenever distributed systems need identifiers without a central counter: database keys, API request IDs, file names, session tokens for non-secret purposes. The canonical format is 32 hexadecimal digits in five hyphen-separated groups (8-4-4-4-12), where the version digit is always 4 and the variant digit is 8, 9, a or b.
This generator uses crypto.randomUUID when the browser provides it, falling back to crypto.getRandomValues with the version and variant bits set manually — both cryptographically secure sources. Generation is entirely local: the identifiers are created on your device and never transmitted.
UUID v4 layout: xxxxxxxx-xxxx-4xxx-Nxxx-xxxxxxxxxxxx, where x is a random hexadecimal digit and N is one of 8, 9, a or b (the variant). 122 random bits give 2¹²² ≈ 5.3 × 10³⁶ possible values.
In theory yes, in practice no. With 122 random bits, you would need to generate about 2.7 × 10¹⁸ UUIDs to reach a 50% chance of a single collision.
None in practice — GUID is Microsoft's name for the same 128-bit identifier. The formats are interchangeable.
Yes. UUID v4 keys avoid the coordination problem of sequential IDs. Note that random keys can fragment clustered indexes — some databases prefer time-ordered variants (v7) for high-volume tables.
No. Generation runs in JavaScript on your device with the browser's cryptographic generator. Nothing is transmitted.
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