UUID Generator

Generate secure, random UUID v4 strings for your applications and databases.

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Quick Tip

Set how many UUIDs you want.

About This Tool

Why use UUID Generator?

Generate version 4 UUIDs — 128-bit identifiers written as 36 characters in the 8-4-4-4-12 pattern, with 122 of those bits taken from a cryptographically secure random source. Choose how many you need and generate them in one go.

The point of a v4 UUID is that separate systems can create identifiers independently and still not collide. With 2¹²² possible values, the chance of a repeat is negligible for any realistic workload, which is why they are used for database keys, request tracing and idempotency tokens.

Key Benefits

Cryptographically random

Values come from the browser's secure random source, not from Math.random, so they are not predictable.

Correct v4 format

The version and variant bits are set as the standard requires, so the output validates as a real v4 UUID.

Bulk generation

Produce a batch and copy it in one action for seeding test data.

How to use UUID Generator

1
Set how many UUIDs you want.
2
Generate, and the list appears immediately.
3
Copy one at a time, or copy the whole list.
4
Generate again for a fresh set; values are never reused.

Best use cases

Create primary keys for records inserted from different services.

Generate correlation IDs for tracing a request across systems.

Seed test data with unique identifiers.

Produce an idempotency key for an API call.

UUID Generator FAQs

What is a version 4 UUID?

An identifier whose bits are random apart from the fixed version and variant markers. The 13th character is always 4, and the 17th is 8, 9, a or b.

Can two UUIDs ever be the same?

In theory yes, in practice no. With 2¹²² random values you would need to generate billions per second for many years before a collision became likely.

Should I use a UUID as a database primary key?

It works well for distributed systems, but random UUIDs scatter inserts across an index. Many teams use UUIDv7 or a sequential ID internally and expose a UUID publicly.

Are these UUIDs safe to use as secrets?

They are unpredictable because they come from a secure random source, but they are often logged and shared. Use a dedicated token for anything that needs to stay secret.