Generate cryptographically random version 4 UUIDs — one or a hundred at a time, with hyphen, case and brace options.
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UUIDs solve a specific problem: you need an identifier that is unique across machines, databases and time, and you cannot afford to ask a central authority for it. Version 4 does this by being almost entirely random, which means any two systems can generate identifiers independently and never clash.
That property makes them the default for distributed systems — merging records from two databases, generating a key before a row is inserted, tagging a request so it can be traced across a dozen services. Auto-incrementing integers cannot do any of that without coordination.
The formatting options exist because different systems expect different shapes. Standard lowercase with hyphens is the RFC form and the right default; uppercase is common in older enterprise tooling; braces are the Microsoft convention; and the hyphen-free form is what you want when storing a UUID as a compact hex string.
A 128-bit identifier where 122 of the bits are random. It needs no central coordination, which is why it is the standard choice for database primary keys, request identifiers and distributed systems.
In theory yes, in practice no. With 122 random bits you would need to generate billions of UUIDs per second for a century before a collision became likely.
They use your browser's cryptographic random source, so they are unguessable. That said, a UUID is an identifier, not a secret — do not use one as an access token on its own.
Some databases and storage systems want the raw 32 hex characters, and removing the hyphens saves four bytes per row. The braces option matches Microsoft's registry and COM formatting.
Yes, up to a hundred at a time, one per line — ready to paste straight into a seed script, a spreadsheet or a test fixture.
No. Generation happens in your browser, so the identifiers are yours alone and are never recorded.
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