🆔 UUID Generator

About this UUID Generator

A UUID is a 128-bit identifier written as 32 hex digits in five hyphenated groups. Version 4 UUIDs are filled with secure randomness, making collisions practically impossible even when billions are generated independently. This tool creates them with crypto.randomUUID where available, with a standards-correct fallback built from crypto.getRandomValues.

How to use it

1. Enter how many UUIDs you need, from 1 to 50.
2. Tick Uppercase if your system expects capital hex letters.
3. Click Generate UUIDs.
4. Copy the list — one UUID per line — into your database, config or code.

Example

Every result looks like the classic pattern 550e8400-e29b-41d4-a716-446655440000: five groups of 8-4-4-4-12 hex digits, with a 4 starting the third group marking version 4.

Frequently asked questions

Could two generated UUIDs ever match?

In theory yes, in practice no. With 122 random bits, you would need to generate billions of UUIDs per second for years before a collision became likely.

What does version 4 mean?

It means the UUID was generated from random numbers rather than from a timestamp or MAC address. The version digit 4 and the variant bits are set automatically.

Are these safe to use as database IDs?

Yes — v4 UUIDs are the standard choice for distributed systems precisely because no central counter or coordination is needed.

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