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UUID generator

Generate random UUIDs for fixtures and identifiers.

Enable JavaScript to use this interactive tool. Paste input, choose options, then copy or download the result, or save it to your notebook.

Example and common questions

Create identifiers for test fixtures, sample records, or request tracking. Each run uses the browser cryptographic random generator and replaces the displayed result.

How to generate UUIDs

  1. Choose a count from 1 to 1,000.
  2. Select lines or a JSON array, then choose Generate UUIDs.
  3. Copy, download, or save the identifiers before generating a new batch.

One example of the UUID v4 shape

Number of UUIDs
1
Output format
lines
Example UUID (each run differs)
123e4567-e89b-42d3-a456-426614174000
Which UUID version is generated?

Random version 4 UUIDs with the standard hyphenated lowercase representation, also known as GUIDs.

Will a rerun give the same identifiers?

No. Each run generates a fresh random batch. Save or download the current output if you need to keep it.

Can I generate a JSON fixture?

Yes. Choose JSON to get an array of strings that can be saved as a JSON note or downloaded as a .json file.

Common errors and limitations

Count must be a whole number between 1 and 1,000. Generation needs Web Crypto on HTTPS or localhost. Random identifiers are not passwords, and uniqueness is probabilistic.