Free Online UUID/GUID Generator
Generate cryptographically secure UUID v4 (Universally Unique Identifier) values using your browser's native crypto API. Generate single or batch UUIDs (up to 100 at once), copy individual values or all at once, and choose between standard hyphenated format or compact format. UUIDs are essential for database primary keys, distributed systems, session tokens, and any scenario requiring globally unique identifiers.
Common questions
Are the generated UUIDs truly unique?
UUID v4 uses 122 bits of randomness, giving 5.3 × 10^36 possible values. The probability of generating a duplicate is astronomically low — you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one collision.
What's the difference between UUID and GUID?
They're the same thing. UUID (Universally Unique Identifier) is the standard term defined by RFC 4122. GUID (Globally Unique Identifier) is Microsoft's term for the same concept. The formats are identical.