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UUID Generator – Generate UUID v4 Online

Generate UUID v4 online for free with ToolGuru. Create one or many random UUIDs (GUIDs) in your browser using a cryptographically secure source. No account required.

Generate between 1 and 100 UUIDs.

Version

UUID v4

Random UUIDs from the browser’s secure API.

🔒 Your data is processed in your browser and is not uploaded to our server.

Free UUID v4 generator

Generate random UUIDs (also called GUIDs) for database keys, test fixtures, and API clients. This unique ID generator creates UUID v4 values in your browser with a cryptographically appropriate random source — not Math.random().

Generate one UUID or a batch

Set the quantity from 1 to 100, then generate. Copy a single line or copy all UUIDs at once. A cap of 100 keeps the page responsive if you ask for a large list.

UUID v4 layout

Each value looks like 550e8400-e29b-41d4-a716-446655440000, with a 4 in the version position. That is the standard random UUID format used across most programming languages.

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How to Generate UUIDs

  1. Step 1

    Set the quantity

    Choose how many UUIDs you need, from 1 to 100. The default is 10.

  2. Step 2

    Generate

    UUID v4 values are created with the browser’s secure random API (crypto.randomUUID).

  3. Step 3

    Copy what you need

    Copy a single UUID or copy all of them, then clear the list when you are done.

Frequently Asked Questions

What is a UUID?

A UUID (universally unique identifier), sometimes called a GUID, is a 128-bit value used as an ID in databases, APIs, and distributed systems. UUID v4 is a random version.

What version does this generator create?

UUID v4. Each value uses the v4 layout: a 4 in the version nibble and a variant of 8, 9, a, or b.

Are these UUIDs cryptographically random?

Yes, when the browser provides crypto.randomUUID or crypto.getRandomValues. The generator does not use Math.random().

How many UUIDs can I generate at once?

Up to 100, so a large batch cannot freeze the page. Generate again if you need more.

Is the UUID generator free?

Yes. Generate and copy UUIDs without an account.

Are generated UUIDs sent to a server?

No. Your data is processed in your browser and is not uploaded to our server.

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