UUID Generator
Generate up to 100 version 4 UUIDs using your browser’s secure random source. Includes bulk copy, UUID format details, and practical limitations.
How to generate UUIDs
- Choose a whole-number count from 1 to 100.
- Select Generate UUIDs.
- Copy the result. Each UUID is on its own line.
What does a version 4 UUID look like?
A UUID is commonly written as 32 hexadecimal digits in five groups, separated by hyphens. For example, 550e8400-e29b-41d4-a716-446655440000 shows the format; do not reuse that illustrative identifier as a unique production value.
The first character of the third group is 4, identifying this version. The generator sets the required version and variant bits and obtains the other bits from the browser’s secure random source.
Where UUIDs are useful
Use identifiers in test fixtures, sample records, or systems that accept version 4 UUIDs. Generated values do not contain a timestamp or describe the object they identify. Copying an existing UUID does not create a new one.
Limitations
Random UUIDs make collisions extremely unlikely, not impossible. A database should still enforce its required uniqueness constraints. An identifier is not an authorization check, password, or access token: do not grant access merely because someone knows a record’s UUID.
Frequently asked questions
Are these UUIDv7 values?
No. This tool generates random version 4 values only. It does not create time-ordered UUIDv7 identifiers.
Are the values sent to a generator service?
No generator service is called. The values are created in the browser. The page still uses the site’s normal hosting and advertising services.
Why might generation fail?
The tool requires the Web Crypto random source and deliberately has no Math.random fallback. See MDN’s explanation of secure version 4 UUIDs.