UUID Generator
Generate v4 UUIDs instantly
Click Generate to create UUIDs
Uses crypto.randomUUID() for cryptographically secure UUIDs
About UUID v4
UUID v4 (Universally Unique Identifier version 4) uses random numbers to generate unique identifiers. The probability of collision is astronomically low (1 in 2^122).
About UUID & GUID Generator (v4)
1What is it?
Generate cryptographically secure UUIDs (Universally Unique Identifiers) and GUIDs (Globally Unique Identifiers) instantly. Version 4 UUIDs are 128-bit numbers generated using true randomness, making them perfect for database primary keys and distributed systems. Collision-safe and ready for production use.
2Use Cases
- Generate unique primary keys for databases (Postgres, MongoDB)
- Create session tokens for web applications
- Assign unique IDs to uploaded files
- Generate correlation IDs for tracing microservices
- Create mock data for development
3Examples
UUID v4
Input
Generate UUID
Output
550e8400-e29b-41d4-a716-446655440000
Bulk Output
Input
Bulk (3)
Output
c9c3b... 2d1a... 9f8b...
?Frequently Asked Questions
Are UUIDs and GUIDs the same?
Yes, functionally. UUID is the IETF standard name, while GUID is the Microsoft terminology. Both refer to 128-bit unique identifiers.
How unique is 'Universally Unique'?
Extremely. The probability of generating a duplicate v4 UUID is roughly 1 in 2.7 quintillion. You are more likely to be hit by a meteorite than to generate a collision.
Is it secure for sessions?
Yes, because we use the browser's cryptographic random number generator (CSPRNG), the UUIDs are unpredictable and safe for session IDs.