UUID Generator (v4)

Create random UUID v4 values for APIs, databases, and tests. Generation stays in your browser using the Web Crypto API.

  • 137d682b-1f4e-46fe-99ee-bb012cc11473
  • f58552db-14dd-4f6e-ac5c-1cbdf71bb507
  • cabb9db2-1578-4c6a-a967-3371325aa74a
  • 1f679174-1195-438e-b5da-8cb7c95f1ec0
  • c241585a-5b83-4103-b4c8-16ab09451872

UUIDs are for uniqueness, not secrecy. Do not use them alone as authentication tokens.

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What Is a UUID?

A Universally Unique Identifier is a 128-bit label, often shown as 36 characters including hyphens. Version 4 uses random bits (with standard version and variant fields) so collisions are extremely unlikely for practical workloads.

How to Use This Generator

  1. Set a count from 1 to 50 for how many UUIDs you need in one batch.
  2. Generate refreshes the list with new random v4 values.
  3. Copy individual rows or use Copy all for a newline-separated list.

Why ToolLane?

  • No server round-trip for generation.
  • Fast batches for local development and fixtures.

Frequently asked questions

Answers about this free UUID generator.