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UUID Generator

🔒 In your browser

Generate v4 UUIDs, single or in bulk.

About the UUID Generator

UUIDs (also called GUIDs) are 128-bit identifiers that are unique without a central authority, perfect for database keys, request IDs and distributed systems. This free UUID generator creates random version-4 UUIDs one at a time or in bulk.

Generation happens in your browser — no server involved.

How to generate UUIDs

  • Generate a single random v4 UUID, or a batch for seeding data.
  • Copy the results for use as keys or identifiers.

What UUIDs are for

A UUID is a 128-bit identifier unique enough to generate anywhere without coordinating with a central authority — ideal for database primary keys, request and trace IDs, and distributed systems where two machines must mint IDs that never collide. Version 4 UUIDs are built from random numbers, which is why you can create them offline and still trust they won't clash.

Frequently asked questions

What is a UUID?

A Universally Unique Identifier is a 128-bit value, usually shown as 36 characters like 550e8400-e29b-41d4-a716-446655440000, that is practically guaranteed to be unique.

What is a version-4 UUID?

A v4 UUID is generated from random numbers, which makes it easy to create anywhere without coordination — the most common type for application IDs.

Are the UUIDs really unique?

The chance of a collision between random v4 UUIDs is astronomically small, so they're treated as unique in practice.

Are v4 UUIDs really unique?

The chance of two random v4 UUIDs colliding is astronomically small — you'd need to generate billions before it became a realistic concern — so they're treated as unique in practice.

Related searches

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Copy this and paste it into your page's HTML. The tool runs in the visitor's browser, just like here. Change height to fit, or add the optional auto-resize snippet below. Add ?theme=dark to the URL for dark mode.

<iframe src="https://toolhq.dev/embed/uuid-generator/" title="UUID Generator — ToolsHub" width="100%" height="520" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" loading="lazy"></iframe>
Optional: auto-resize the iframe height

Add this once on the same page so the iframe grows to fit the tool:

<script>
addEventListener("message", function (e) {
  if (e.data && e.data.type === "toolshub:resize") {
    document.querySelectorAll('iframe[src*="/embed/"]').forEach(function (f) {
      if (f.contentWindow === e.source) f.style.height = e.data.height + "px";
    });
  }
});
</script>