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UUID Generator

Generate a cryptographically random version 4 UUID without sending it to a server.

Generated on this deviceNew result with each generation

Generation settings

Runs on your device

Generate a fresh result with one click.

YOUR GENERATED RESULT

Ready when you are

Let’s generate.

Use the Generate button to see your result.

Generated values are not saved.

How to use this tool

  1. Select Generate to create a new result.
  2. Use Copy result to copy the complete value.
  3. Select Generate again for another independent result.

The method, explained

UUID v4 uses 122 random bits plus version and variant bits, formatted as 8-4-4-4-12 hexadecimal digits. The browser generates it with crypto.randomUUID().

A WORKED EXAMPLE

A UUID has the shape xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where y encodes the variant. Generate to receive a new identifier.

What to keep in mind

Collisions are extremely unlikely but not mathematically impossible. UUIDs are identifiers, not substitutes for authorization or secrets.

Common questions

Is the result a version 4 UUID?

Yes. The version nibble is 4, and the variant follows the UUID standard.

Can I use it as an access token?

Use a purpose-designed authentication system instead. An identifier alone should not grant access.

Methodology maintained by ClarityKit. How these tools are built and checked.