UUID Generator
Generate version 4 UUIDs instantly. Create 1 to 100 UUIDs at once with one-click copy. Free, runs in your browser.
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Frequently asked questions
- What version of UUID is generated?
- Version 4 (random). It uses the browser's crypto.randomUUID() or a fallback using crypto.getRandomValues().
- Are these UUIDs collision-resistant?
- Yes. Version 4 UUIDs have 122 random bits. The chance of collision is astronomically small (1 in 2^122).
- Can I generate multiple at once?
- Yes. Set count to 1-100 for bulk generation. Each is independent and cryptographically random.
- What's the difference between UUID and GUID?
- They are the same thing. GUID is Microsoft's term; UUID is the RFC 4122 standard name.
- What is the nil UUID option for?
- The nil UUID is all zeroes and is used as an explicit placeholder for no value, for example as a default foreign key in tests. Pick Nil UUID in the version list to produce it.
- Can I match the format my database expects?
- Yes. Uppercase, remove hyphens, and wrap in braces are independent toggles, and Copy all puts the whole list on the clipboard one per line in the same format.