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UUID / GUID Generator
About UUID and GUID
UUID (Universally Unique Identifier)
A Universally Unique Identifier is an international standard. It is a 128-bit number designed to generate an identifier that is unique globally. No matter where or when you generate it, it is extremely unlikely to collide with another existing UUID.
GUID (Globally Unique Identifier)
Globally Unique Identifier is a specific term for UUID in the Microsoft technology ecosystem. You can think of UUID as a universal concept, while GUID is the specific implementation of this concept in Windows or .NET environments. In most cases, these two terms can be used interchangeably.
UUIDv4: The Most Common Version
UUIDv4 is the fourth version of the UUID standard and the most commonly used type. It was formally defined in RFC 4122 (published in July 2005). The core feature is that it is completely based on random number generation. This means that each UUIDv4 is created through a secure, cryptographic-grade random process. This generation method provides strong uniqueness guarantees, making it ideal for database primary keys, API identifiers, or any scenario requiring unique identifiers.
How Does This Tool Work?
This tool uses the Web Crypto API to generate UUIDv4 compliant with RFC 4122 specifications. By combining these technologies, each UUID you get is standards-compliant, secure, and unique.
- RFC 4122 This is the international standard document that defines the official rules for UUIDs.
- Web Crypto API This is a modern browser API used to generate high-strength cryptographic random numbers, ensuring the randomness and security of each UUID.
Key Features
- RFC 4122 Version 4 compliant
- Cryptographically secure random generation
- Perfect cross-platform compatibility
- Extremely low collision probability (~5.3×10⁻³⁷)
- Multiple output format support
- Batch generation capability
Use Cases
- Database primary key generation
- User session identifiers
- API request tracking IDs
- Temporary file naming
- Distributed system correlation IDs
- Order number generation