UUID Generator

Generate up to 100 standard UUID v4 values with cryptographic randomness.

Reviewed: 2026-07-21

Method and assumptions

Create 122 random bits with the browser's cryptographic generator, set the required version and variant bits, and format each value as an RFC 9562 UUID version 4. Generation happens only on the current device and results are not stored or sent to our server. UUIDs make collisions extremely unlikely, but they are public identifiers rather than passwords, session tokens, or API keys.

How to use it

Enter a batch size from 1 to 100 UUIDs.
Select Generate to create a fresh UUID v4 list.
Copy the output or download it as a line-separated text file.

When it helps

Creating identifiers for database test records
Assigning temporary object IDs in distributed systems
Adding correctly formatted sample values to technical mockups

How to verify the result

Check input units and reference dates first. For an important decision, compare the result with an official source or original document. A rounded display can differ slightly from the underlying value.

Official references

RFC 9562 UUID standard

Frequently asked questions

Which standard defines this UUID v4 format?

It follows the version 4 layout and variant bits in RFC 9562, displayed in the familiar 8-4-4-4-12 hexadecimal form.

Can two generated UUIDs ever be identical?

It is theoretically possible, but the collision probability is extremely low when UUID v4 values use secure randomness. Add uniqueness checks when your system's risk model requires them.

Can I use a UUID as a login token?

It is not recommended. Treat UUIDs as public identifiers and use purpose-built security tokens with sufficient entropy, expiration, and revocation for authentication.