UUID v4 generator
UUID v4 generator creates a grouped identifier for sample records and test fixtures. Inspect version and variant fields and understand the generation limits.
UUID v4 generator helps you create an identifier in the familiar version 4 UUID layout for example records, fixtures, and applications that expect its grouped hexadecimal notation. Start with a representative sample of your actual task. Read the form labels and the returned value before replacing text, a link, or a code fragment that is already in use.
How to use UUID v4 generator
- Inspect the generated identifier.
- Use Submit for another value.
- Copy the full string with every group and hyphen.
Worked example
550e8400-e29b-41d4-a716-446655440000 illustrates the 8-4-4-4-12 grouping. The 4 at the start of the third group identifies the version field.
Limits and checks
The implementation uses mt_rand, not a cryptographic random source. Do not use these values as secret credentials or reset tokens. Enforce uniqueness in the receiving application rather than treating the format as a guarantee.
Frequently asked questions
Can the result replace application requirements?
No. Check the length, format, and purpose required by the destination application. An identifier, a random integer, and a password serve different roles and are not interchangeable merely because they look unpredictable.
How do I recognize the version field in the example?
The example uses 8-4-4-4-12 hexadecimal grouping, and the third group starts with 4. These format markers describe the identifier layout; they do not establish cryptographic randomness or prove uniqueness.
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