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UUID v4 Generator

Generate random RFC 4122 version 4 UUIDs in bulk.

To generate UUIDs, set how many you need and they are produced instantly using crypto.randomUUID, the browser's built-in RFC 4122 version 4 generator. Version 4 UUIDs are 122 bits of randomness, so collisions are effectively impossible in practice.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Can two UUIDs ever collide?

In theory yes, in practice no. A v4 UUID has 122 random bits; you would need to generate about 2.7 × 10^18 of them before a 50% chance of any collision.

What is the difference between UUID and GUID?

They are the same 128-bit format. GUID is Microsoft's name for it. The only practical difference is that Microsoft tooling often displays them in braces and uppercase.

How to use the uuid v4 generator

  1. 1Set the how many.
  2. 2Turn "Uppercase" on or off as needed.
  3. 3Turn "Include hyphens" on or off as needed.
  4. 4The result appears immediately — copy or download it.

Sources & specifications

Embed this tool

Put the working uuid v4 generator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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