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UUID Generator

Generate cryptographically secure UUIDs (v4 random, v7 timestamp-based).

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Runs entirely in your browser. Generated UUIDs never leave this device.

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Creating cryptographically secure identifiers.

UUID Generator produces cryptographically secure identifiers in two versions: v4, which is random, and v7, whose leading timestamp makes the values sort by creation time. The randomness comes from the Web Crypto API rather than a seeded pseudo-random source, because an identifier that can be predicted is not an identifier you should put in a database key. Generation is capped at a thousand values per run to keep the browser responsive. The v7 form is the one to reach for when you want identifiers that stay in insertion order without a separate timestamp column: its millisecond prefix sorts correctly as text. The page explains both versions rather than picking one for you. It is the tool for seeding test fixtures with a distinct identifier per run, for producing correlation IDs for distributed tracing, and for filling a table of records with keys that will not collide. Nothing is uploaded and no identifier is stored anywhere. The page shows the count it produced alongside the values, so a run that returned fewer identifiers than requested is visible rather than silently short.

How to use UUID Generator

  1. Select version (v4 random or v7 timestamp-based).
  2. Choose output format.
  3. Set count and generate.

What you get

  • Between one and 1,000 RFC 4122 identifiers per generation, v4 or v7.
  • Four output shapes: standard lowercase, UPPERCASE, braced {uuid}, and urn:uuid: form.
  • A copyable or downloadable list of the generated values.

When to use UUID Generator

  • Generate unique IDs for database records or API keys.
  • Create correlation IDs for distributed tracing.
  • Seed test fixtures with a distinct identifier for every run.
  • Generate a batch of correlation IDs for a load test, then sort them to read the run in order.

Frequently asked questions about UUID Generator

Are these UUIDs cryptographically secure?

Yes. v4 uses crypto.randomUUID() or crypto.getRandomValues(). v7 combines timestamp with crypto.getRandomValues().

What is UUID v7?

UUID v7 encodes a Unix timestamp (milliseconds) plus random bits. It sorts chronologically, making it ideal for database indexes and logs.

Can I generate many UUIDs at once?

Up to 1,000 at a time. For more, run multiple batches.

What formats are supported?

Standard (lowercase with hyphens), UPPERCASE, Braced {uuid}, and URN urn:uuid: prefix.

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