DataHub Tools UUID Generator

UUID Generator

Local-first

Generate random UUID v4 values locally for tests, records, fixtures, and temporary identifiers.

What is UUID Generator?

Generate random UUID v4 values locally for tests, records, fixtures, and temporary identifiers.

  • Generate UUID v4 values
  • Create multiple IDs at once
  • Copy identifiers for tests and records

How to use it

  1. Enter how many UUID v4 values to generate, from 1 to 100.
  2. Choose Generate or use the shortcut for ten values.
  3. Copy each UUID as an opaque identifier without changing its hyphen layout.
  4. Check uniqueness at the database layer when identifiers enter a persistent system.

Quick example

Example input

3

Expected output

Three random UUID v4 values, one per line

UUIDs are identifiers, not secrets. Random UUID v4 values are not ordered by creation time.

Best use cases

  • Create test record and API identifiers.
  • Prepare seed data without sequential IDs.
  • Generate browser-local UUID v4 values for prototypes.

Reference standards and behavior

RFC 9562 defines UUID formats and version 4 random UUIDs. This tool generates UUID v4 values only; it does not generate time-ordered versions.

Sources checked July 24, 2026. Standards can change; review the source pages before formal integration.

Notes

  • The page uses crypto.randomUUID when available and Web Crypto random bytes as fallback.
  • Generation is capped at 100 values per run.
  • Do not place credentials or personal information inside an identifier.

FAQ

Which UUID version is generated?

The page generates random UUID version 4 values in the standard 8-4-4-4-12 layout.

How many UUIDs can I generate?

Enter 1 to 100. Values outside that range are limited to the nearest supported value.

Are UUIDs guaranteed unique?

Collisions are extremely unlikely, but persistent systems should still enforce a unique constraint.

Are UUIDs secret tokens?

No. UUIDs are identifiers and should not be treated as credentials or access tokens.

Are the results time ordered?

No. UUID v4 values are random and do not encode creation time.

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