UUID v1 Generator
A time-based UUID generated using timestamp and MAC address, containing time-series order information. Suitable for logging, event tracking, and applications requiring time-series order.
UUID V4 Generator
Back to UUID Tools ListHere are the generated UUID V4 results
Batch Generate
Enter the quantity and click "Generate" to batch create UUID V4
FAQ
What is UUID v4?
UUID v4 is a universally unique identifier generated from random numbers, ensuring high uniqueness across different systems. It contains fixed version and variant fields, while the remaining bits are generated by a pseudo-random algorithm.
What are the advantages of UUID v4?
The main advantages of UUID v4 are its high randomness and unpredictability, ensuring global uniqueness in distributed environments. The generation process does not rely on any centralized service or coordination, nor does it expose system information, making it ideal for scenarios requiring randomness, high security, and unique identifiers without a centralized architecture.
Does UUID v4 have any drawbacks?
The main drawback of UUID v4 is its lack of order, which can affect performance when used as a database primary key. Randomly generated UUIDs can cause frequent insertions and deletions, reducing index efficiency.
What is the probability of a UUID v4 collision?
The theoretical collision probability of UUID v4 is extremely low, with approximately 5.3 × 10³⁶ possible unique values. Even at very high generation rates, collisions are negligible for most applications, making it highly reliable for databases, API identifiers, session IDs, and similar use cases.
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Online UUID Generator Tool
A UUID is a universally unique identifier generated from completely random numbers, with an extremely low chance of duplication, ensuring near-global uniqueness.