UUID Generator
/uuid-generatorGenerate RFC 4122 v4 UUIDs instantly. Options for uppercase and hyphen-free formats, up to 100 at once.
UUIDs are the default identity scheme for modern databases and distributed systems. This generator produces RFC 4122 v4 UUIDs with genuine random values, up to 100 at a time. You can switch between uppercase, lowercase, and hyphen-free formats. Generation is fully local, so identifiers are not guessable from server-side state.
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FAQ
Frequently asked questions
Everything you need to know about uuid generator.
What UUID version is generated?
Version 4 random UUIDs, produced by the browser's crypto.randomUUID API which uses a cryptographic random source.
How many can I generate at once?
Between 1 and 100 per click. The count is clamped to that range, which is convenient for seeding databases or test data.
Can I customize the output format?
Yes. Two toggles are available: uppercase hex and hyphen-free output, which produces a 32-character compact string.
Are these cryptographically secure?
Yes. crypto.randomUUID draws from the browser's cryptographic randomness, so the UUIDs are not predictable.
Can I copy all generated UUIDs?
Yes. A single copy button exports the whole list with one UUID per line, ready to paste into a spreadsheet or script.
Do UUIDs ever repeat?
With v4 randomness, collisions are practically impossible within the 100-per-click limit and far beyond it.
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