What version of UUID does this generate?

It generates version 4 (random) UUIDs, the most common type for database keys and app identifiers. They are created with your browser's crypto.randomUUID(), so they use a cryptographically strong random source.

How many UUIDs can I create at once?

From 1 up to 500 in a single batch. Type the amount in the How many field, press Generate, and every UUID appears on its own line so you can copy the whole list at once.

Are these UUIDs unique and safe to use as IDs?

Version 4 UUIDs are random across 122 bits, so the chance of two ever colliding is effectively zero. They are well suited as primary keys or record IDs in distributed systems where you cannot coordinate a counter.

Is the UUID generator private and free?

Yes. Every value is generated locally in your browser and nothing is uploaded to a server. The tool is free, needs no sign-up, and has no usage limits.

UUID Generator | JotTools

How many

What the UUID Generator does

This tool creates random version 4 UUIDs (also called GUIDs), the 128-bit identifiers that look like f47ac10b-58cc-4372-a567-0e02b2c3d479. It is handy for developers seeding a database, naming records, tagging API requests, generating test fixtures, or filling in a primary key that will never collide with another. You can produce one UUID or up to 500 in a single pass, with each value on its own line ready to paste.

Every UUID comes from your browser’s built-in crypto.randomUUID(), the same cryptographically strong source modern apps rely on. Nothing is sent anywhere.

How to use it

Open the UUID Generator. A batch of UUIDs appears right away, so you can grab one immediately.
In the How many field, type the number of UUIDs you need (anywhere from 1 to 500).
Press the Generate button to refresh the list with new random values.
Click Copy to put the whole list on your clipboard, or select a single line from the output box.

Why generate UUIDs here

It is instant and local. The values are built on your device, so no identifier ever travels over the network, which matters when you are creating keys for a private system. There is no account to create, no daily cap, and no cost. The output uses a monospace font so every character stays readable, and the result box is resizable when you pull a long batch.

Because version 4 UUIDs are random, the odds of two ever matching are vanishingly small, which is exactly why they work so well as standalone IDs across distributed systems.

Tip

Need test data alongside your IDs? Pair this with the Lorem Ipsum, random number, and fake-name generators on JotTools to mock up a full sample dataset in seconds. For heavy automation across many files at once, the BulkPro desktop app from the same team is a good companion.

Frequently asked questions

What version of UUID does this generate?: It generates version 4 (random) UUIDs, the most common type for database keys and app identifiers. They are created with your browser's crypto.randomUUID(), so they use a cryptographically strong random source.
How many UUIDs can I create at once?: From 1 up to 500 in a single batch. Type the amount in the How many field, press Generate, and every UUID appears on its own line so you can copy the whole list at once.
Are these UUIDs unique and safe to use as IDs?: Version 4 UUIDs are random across 122 bits, so the chance of two ever colliding is effectively zero. They are well suited as primary keys or record IDs in distributed systems where you cannot coordinate a counter.
Is the UUID generator private and free?: Yes. Every value is generated locally in your browser and nothing is uploaded to a server. The tool is free, needs no sign-up, and has no usage limits.

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Last updated: June 15, 2026