UUID Generator

How to Use

Enter how many UUIDs you want and click Generate. The tool produces that many random v4 UUIDs, which you can copy individually or all at once with Copy all. Generate a fresh batch any time — no two will repeat in practice.

Why This Tool Is Useful

UUIDs are the standard way to create unique identifiers without a central database — for primary keys, API request IDs, file names, test data, and distributed systems. Generating them by hand is impossible, and online generators that call a server add latency and a privacy question. This one runs locally using crypto.randomUUID, so it's fast, secure, and offline-friendly.

What Is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID (Globally Unique Identifier) on Microsoft platforms, is a 128-bit value written as 36 characters in the form 8-4-4-4-12, like 550e8400-e29b-41d4-a716-446655440000. Its purpose is to be unique across space and time without coordination between systems.

Version 4 (Random) UUIDs

This generator produces version 4 UUIDs, which are based almost entirely on random numbers. They're the most common type because they need no input data and carry no information about the machine or time that created them, which is good for privacy.

It uses crypto.randomUUID, the browser's built-in secure UUID function, so the randomness is cryptographically strong.

Are UUIDs Really Unique?

In practice, yes. A version 4 UUID has 122 random bits — about 5.3 × 10^36 possibilities. The odds of generating the same one twice are so astronomically small that collisions are considered impossible for any realistic number of IDs. You can safely use them as unique keys.

Common Uses

UUIDs show up all over modern software:

• Database primary keys that don't reveal record counts.
• Request or transaction IDs for tracing and logs.
• Unique file or upload names to avoid clashes.
• Idempotency keys for safe API retries.
• Random test or sample data.

UUID Versions at a Glance