Generate unique identifiers (UUIDs) for your applications
Using our UUID generator is incredibly straightforward and efficient. Simply click the "Generate UUID" button to create a new universally unique identifier instantly. The tool generates UUID version 4 by default, which uses random or pseudo-random numbers to ensure uniqueness. Each generated UUID appears in the output field in the standard format: 8-4-4-4-12 hexadecimal digits separated by hyphens. You can copy the UUID to your clipboard with a single click using the copy button. If you need multiple UUIDs, simply click the generate button repeatedly – each click produces a completely new and unique identifier. The tool also maintains a history of recently generated UUIDs for your convenience, allowing you to reference or copy previously created identifiers. Whether you need one UUID or hundreds, our generator handles bulk creation efficiently. The generated UUIDs are suitable for use in databases, APIs, file naming, session management, and any application requiring unique identifiers. All UUIDs are generated locally in your browser, ensuring privacy and eliminating any dependency on external servers.
Our UUID generator implements the UUID version 4 specification (RFC 4122) using cryptographically secure random number generation. The process begins by generating 128 bits of random data using the Web Crypto API's getRandomValues() method, which provides cryptographically strong random values suitable for security-sensitive applications. The algorithm then applies specific bit manipulations to ensure compliance with UUID v4 standards: setting the version bits to indicate UUID version 4 and configuring the variant bits according to RFC specifications. The 128-bit value is then formatted into the standard UUID representation with five groups of hexadecimal digits separated by hyphens. This format ensures compatibility with all systems and programming languages that support UUIDs. The mathematical probability of generating duplicate UUIDs is astronomically low – approximately 1 in 5.3 x 10^36 for version 4 UUIDs. Our implementation follows industry best practices for randomness and formatting, ensuring that generated UUIDs meet the highest standards for uniqueness and reliability across distributed systems and applications.
The UUID Generator is an essential tool for developers, system administrators, and anyone working with distributed systems or databases that require unique identifiers. Universally Unique Identifiers (UUIDs) are 128-bit values used to uniquely identify information in computer systems without requiring a central authority to assign identifiers. This makes them perfect for distributed applications, microservices, database primary keys, session tokens, and file naming systems. Our free online generator eliminates the need for command-line tools or programming libraries, providing instant access to high-quality UUIDs through a simple web interface. The tool is particularly valuable for developers working with REST APIs, database design, cloud applications, and any system requiring guaranteed unique identifiers. UUIDs generated by our tool are compliant with international standards and work seamlessly across different programming languages, databases, and platforms. The generator operates entirely client-side, ensuring your generated UUIDs remain private and secure. Whether you're building a new application, migrating data, or need unique identifiers for testing purposes, this tool provides the reliability and convenience required for professional development workflows.
Random or pseudo-random UUIDs. Most commonly used version.
Timestamp-based UUIDs that include MAC address information.
UUIDs are 128-bit values displayed as 32 hexadecimal digits in groups: 8-4-4-4-12