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UUID Generator

Generate one or a batch of UUID v4 identifiers with your browser's secure random-number generator. Your output stays on this device.

Enter a whole number from 1 to 1,000. Generation starts only when you press Generate UUIDs.

Ready. Choose how many UUIDs to generate.

One UUID per line. Select the text to copy manually if clipboard access is unavailable.

How to use the UUID generator

  1. Choose a count between 1 and 1,000.
  2. Select Generate UUIDs to create a fresh batch.
  3. Copy all values or download them as a UTF-8 text file.

UUID v4 format

A UUID is a 128-bit identifier written as 36 characters: 32 lowercase hexadecimal digits grouped 8-4-4-4-12 with hyphens. Version 4 reserves bits for the version and RFC-compatible variant; the remaining bits come from cryptographically secure randomness.

Example only: 550e8400-e29b-41d4-a716-446655440000. This is a static format example, not a newly generated identifier.

Common uses

UUIDs can label test fixtures, identify resources in development systems, or seed development data. A random UUID is not a password or secret token. Random generation makes collisions unlikely, but does not prove uniqueness across every system or database.

Frequently asked questions

Which UUID version is generated?

This page generates lowercase UUID version 4 values in the standard hyphenated format.

Can I generate UUIDs in bulk?

Yes. Generate from 1 to 1,000 values in one batch. A new batch replaces the displayed batch.

Are UUIDs generated on a server?

No. Generation uses the browser's Web Crypto API on this device. The page does not send or save the values.

Related developer tools

Validate a JSON fixture with JSONLint, inspect a date identifier with the Unix Timestamp Converter, or browse Developer Tools.