UUID Generator
Generate random version 4 or time-ordered version 7 UUIDs from your browser’s secure random generator.
IDs & Random Tokens
UUID
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Good to know
- Cryptographic randomness: Values come from crypto.randomUUID or crypto.getRandomValues, never from Math.random.
- Standard format: Version and variant bits follow RFC 9562: the third group always starts with 4 and the fourth with 8, 9, a or b.
- Unique in practice: With 122 random bits, a repeated value is astronomically unlikely, though not mathematically impossible. Up to 1,000 at a time.
- Version 7 sorts by time: A v7 UUID (RFC 9562) starts with the time in milliseconds, so a list sorts in the order it was made; Inspect reads the time back.
Frequently asked questions
Are UUIDs and GUIDs the same?
Yes. GUID is Microsoft’s name for the same 128-bit identifier. Some Microsoft tools show them in uppercase, which the option can do.
Can I use them as secret tokens?
They are random, but UUIDs are meant as identifiers, not secrets. For passwords or API keys, use a generator designed for that purpose.