UUID Generator
Generate unique identifiers (UUIDs) for your applications and databases
Generate UUIDs
Configure your UUID generation settings
About UUIDs
UUID Version 1
Timestamp-based UUIDs that include the current timestamp and MAC address. They're guaranteed to be unique but may reveal information about when and where they were generated.
UUID Version 4
Random UUIDs that are generated using random or pseudo-random numbers. They're the most commonly used type and provide excellent uniqueness with no embedded information.
Use Cases
- • Database primary keys
- • Session identifiers
- • File names for uploaded content
- • API request tracking
- • Distributed system identifiers
Frequently Asked Questions
- What is a UUID and why would I need one?
- UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across time and space. UUIDs are used in databases, software systems, and APIs to identify records, sessions, or objects without requiring a central authority to assign IDs.
- What's the difference between UUID version 1 and version 4?
- UUID version 1 is timestamp-based and includes MAC address information, making it partially predictable but ensuring temporal uniqueness. UUID version 4 is randomly generated, providing better privacy and unpredictability, making it ideal for security-sensitive applications.
- Are the UUIDs generated truly unique?
- While mathematically possible, UUID collisions are extremely rare. Version 4 UUIDs have approximately 5.3 x 10^36 possible values, making the probability of generating identical UUIDs negligible for practical purposes.
- Can I use these UUIDs in production applications?
- Yes, the UUIDs generated follow RFC 4122 standards and are suitable for production use. However, always consider your specific use case - version 1 for temporal ordering needs, version 4 for maximum randomness and privacy.