Generate random UUID version 4 identifiers directly in your browser.
Generate random UUID version 4 identifiers directly in your browser.
Information about the UUIDs currently generated by the tool.
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The UUID Generator creates random UUID version 4 identifiers directly in your browser. UUIDs are commonly used as unique identifiers for database records, API resources, distributed systems, objects, sessions, and other application data.
A UUID (Universally Unique Identifier) is a 128-bit identifier represented as a standardized hexadecimal string. UUIDs are designed to provide identifiers that are extremely unlikely to collide when generated independently across different systems.
UUID version 4 generates identifiers primarily from randomly generated values. The UUID contains version and variant bits required by the UUID specification, while the remaining bits provide the random value used to create the identifier.
A standard UUID is displayed as 32 hexadecimal characters separated by four hyphens. The resulting representation contains 36 characters in total.
UUIDs allow applications to generate identifiers without requiring a central counter or coordination between systems. This makes them especially useful in distributed applications where multiple services or clients may create records independently.
GUID is a term commonly associated with Microsoft's implementation of globally unique identifiers, while UUID is the more general standardized terminology. In many software environments, the terms are used interchangeably.
This tool uses the browser's Web Crypto API through crypto.randomUUID() when available. UUID generation happens locally in your browser, so generated identifiers do not need to be transmitted to a server.
UUIDs are useful identifiers, but an identifier should not automatically be treated as an authentication credential, password, authorization token, or secret. Security-sensitive applications should use mechanisms specifically designed for those purposes.
UUIDs generated by this tool are created locally in your browser. The generated values are not uploaded to ToolTunnel for processing or storage.
UUID stands for Universally Unique Identifier. It is a 128-bit identifier designed to provide identifiers with an extremely low probability of collision.
UUID v4 is a UUID version that uses randomly generated values together with the required UUID version and variant bits.
This tool can generate 1, 5, 10, 25, or 50 UUIDs at a time.
UUIDs are not mathematically guaranteed to be unique, but properly generated UUID v4 values have an extremely low probability of collision.
Yes. UUIDs are commonly used as database identifiers, especially in distributed systems where identifiers may need to be generated independently by multiple services.
No. UUIDs are generated locally in your browser and do not need to be sent to a ToolTunnel server.
UUID is the general standardized term, while GUID is commonly used for Microsoft's implementation and is often used interchangeably with UUID.
A UUID should generally be treated as an identifier rather than a password or security credential. Use dedicated cryptographic mechanisms for secrets and authentication tokens.