UUID Generator
Generate cryptographically secure UUID v4 values. Single or bulk generation.
About UUID v4
UUID v4 (Universally Unique Identifier version 4) values are randomly generated using your browser's cryptographically secure crypto.randomUUID() function. They are statistically guaranteed to be unique and suitable for use as database primary keys, file names, and more.
About UUID Generator
UUID version 4 identifiers are 128-bit values whose random portion is generated using a cryptographically secure source. They are useful for correlation IDs, test fixtures, and identifiers where decentralized generation is convenient.
This generator uses the browser Web Crypto API and runs on your device. UUIDs are designed to make collisions extremely unlikely, not mathematically impossible; use a database constraint when uniqueness must be enforced for a critical system.
How to use this tool
Choose a quantity from 1 to 100 and select Generate. Copy an individual identifier, copy the complete list, or download the generated values.
Frequently asked questions
Which UUID version does this tool create?
It creates UUID version 4 values, which are random identifiers with the version and variant bits set according to the UUID standard.
Are the generated UUIDs cryptographically secure?
Generation uses the browser’s Web Crypto randomUUID API. Availability depends on a modern browser and a secure context such as HTTPS or localhost.
Can UUID collisions happen?
A collision is possible in principle, although the probability for correctly generated UUID v4 values is very small. Enforce uniqueness in systems where duplicates would be consequential.
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