UUID Generator

Generate v4 and v7 UUIDs in bulk, cryptographically random.

Version

How many10

Format

What does UUID Generator do?

Generate RFC 9562 UUIDs — random version 4, or time-ordered version 7 which sorts chronologically and makes a far better database key. Produce one or thousands at a time in whichever format your system expects.

How to Use UUID Generator

1
Pick a versionv4 for pure randomness, v7 for sortable keys.
2
Set the quantityOne, or up to a thousand.
3
Choose the formatMatch whatever your system expects.
4
Copy or downloadAll values at once.

Key Features

Version 4 (random) and version 7 (time-ordered) UUIDs
Generate up to 1,000 at once
Standard, uppercase, braced {…}, URN and no-hyphen formats
Cryptographically secure randomness, never Math.random
Copy all or download as a text file

Frequently Asked Questions

Should I use UUID v4 or v7?

v7 for anything stored in a database. Its leading timestamp means new rows insert at the end of the index instead of scattering across it, which avoids the page-split churn that v4 causes. Use v4 where the value must reveal nothing about when it was created.

Can two UUIDs collide?

In practice, no. A v4 UUID has 122 random bits — roughly 5.3 × 10³⁶ possibilities. You would need to generate a billion a second for 85 years to reach a one-in-a-billion collision chance.

Is a UUID the same as a GUID?

Yes, functionally. GUID is Microsoft’s name for the same 128-bit identifier, usually written in braces. The braced format option produces exactly that.

Does a v7 UUID leak information?

It embeds the creation time to millisecond precision, which is visible to anyone holding the value. That is usually harmless, but use v4 if the timing itself is sensitive.

Runs in your browser

Values come from crypto.getRandomValues, your browser’s cryptographically secure random source, and are never transmitted or logged. Copy anything you need before closing the tab — it cannot be recovered.

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