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UUID / GUID & Password Generator

Generate v4 UUIDs and strong, customizable random passwords using your browser’s secure random source.

UUID v4
RFC 4122 random identifiers. Add braces for GUID style.
5
150
  • d2b25b31-ed12-4eb3-8c3b-d1f0444ba0a3
  • 483c21e9-6a3d-4c35-b7cd-49b7cf074b9b
  • 5525d104-8814-41be-b051-cfa0e09286f0
  • 1300a4bd-74eb-4d51-a32d-3b3a41ff4ac6
  • b330c859-a594-4279-8b43-00a19cf52723
Password
Cryptographically random. Regenerates when options change.
^igO5-^P*VR7e_(J{wbk
Very strong · 129 bits
20
864

How the UUID & Password Generator works

Both generators use the Web Crypto API (crypto.getRandomValues), a cryptographically secure random source, rather than Math.random. Version 4 UUIDs carry 122 random bits, making collisions practically impossible.

Password strength is estimated as entropy: the length multiplied by log₂ of the character pool size. Adding symbols or increasing length raises the entropy and the time needed to brute-force the password.

Formulas used

Password entropy
bits = length × log₂(pool size)

How to use the UUID & Password Generator in 3 steps

  1. Step 1

    Choose UUID or password mode.

  2. Step 2

    Set how many UUIDs to create, or the password length and character options.

  3. Step 3

    Press Generate and copy a single value or the whole list.

Frequently asked questions

What is the difference between a UUID and a GUID?

They are the same 128-bit identifier. GUID is Microsoft’s name for it; UUID is the term used in the RFC 4122 standard.

How long should a strong password be?

Aim for at least 16 characters with mixed case, numbers and symbols, which gives over 100 bits of entropy. A password manager makes long passwords practical.

Are generated passwords stored anywhere?

No. They are created in your browser and are never transmitted or saved.

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