No. A UUID v4 is a random identifier, not a password. Use the password generator for secrets.

v4 is purely random (version nibble 4, RFC 4122 variant). No MAC or clock in the ID.

A UUID (Universally Unique Identifier) is a 128-bit identifier written as 32 hexadecimal characters grouped 8-4-4-4-12. It is used as a primary key, a test session ID or a cross-system reference without central coordination.

Can two UUID v4 values be identical?

In theory yes, in practice the probability is negligible: 122 of the 128 bits are random. If uniqueness is critical (database key), still add a uniqueness constraint.

(01) — TOOLS

UUID generator, v4 online.

A UUID shows up as soon as the page loads; Generate draws more. 8-4-4-4-12 IDs via Web Crypto. For test keys and front-end IDs, not for secrets. Nothing is sent.

Click Generate.

At a glance

UUID v4 generator, free, in the browser.
8-4-4-4-12 format, Web Crypto. 1 to 20, optional uppercase.
Not a secret: random identifier, not a password.
Nothing is sent to a server.

(02) — METHOD

Draw bytes, set the version.

01 — Count

Pick 1 to 20 UUIDs. Each draw uses crypto.getRandomValues.

02 — Case

Lowercase hex by default. Tick uppercase if your API needs it.

03 — Copy

Copy one row or the whole batch. Values stay in the tab.

(03) — FAQ

Short answers.

Is this a secret?: No. A UUID v4 is a random identifier, not a password. Use the password generator for secrets.
Why version 4?: v4 is purely random (version nibble 4, RFC 4122 variant). No MAC or clock in the ID.
Is anything sent to a server?: No. Generation is local.
What is a UUID?: A UUID (Universally Unique Identifier) is a 128-bit identifier written as 32 hexadecimal characters grouped 8-4-4-4-12. It is used as a primary key, a test session ID or a cross-system reference without central coordination.
Can two UUID v4 values be identical?: In theory yes, in practice the probability is negligible: 122 of the 128 bits are random. If uniqueness is critical (database key), still add a uniqueness constraint.

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