Is this UUID generator free?

Yes, completely free with no account, subscription, or hidden fee required.

Do you upload or store the UUIDs I generate?

No. The tool runs entirely in your browser using the native crypto.randomUUID() API. No data is sent to any server — your UUIDs stay on your device.

Does it work offline?

Yes. After the page loads once, UUID generation works fully offline because everything is client-side JavaScript with no external requests.

What UUID version does this tool generate?

It generates version 4 (v4) UUIDs, which are randomly generated and RFC 4122-compliant. v4 is the most widely used version for unique identifiers in software development.

Can I generate multiple UUIDs at once?

Yes. You can generate between 1 and 100 UUIDs in a single click, then copy all or download them as a text file.

Could two generated UUIDs ever collide?

In practice, no. A v4 UUID carries 122 random bits, so you would need to generate billions per second for a century before a collision became likely. The randomness comes from the browser's cryptographic generator rather than an ordinary one, which is what makes that guarantee meaningful rather than merely hopeful.

Should I use a UUID as a database primary key?

It depends on the trade-off you want. UUIDs let separate systems create records without coordinating, which is their great advantage. The cost is that random values scatter writes across the index instead of appending to the end, which hurts insert performance on large tables - this is why time-ordered variants such as UUIDv7 exist.

🆔 UUID Generator

Instantly generate cryptographically secure random v4 UUIDs — completely free and runs entirely in your browser with no upload, no login, and no server involved.

Count

Set options and click Generate.

Private by design. This tool runs entirely in your browser — nothing you enter is uploaded or stored, and it works offline.

About

This tool uses the browser's built-in crypto.randomUUID() API to produce RFC 4122-compliant version 4 UUIDs, so every identifier is statistically unique and cryptographically unpredictable. You can generate 1 to 100 UUIDs at a time, toggle uppercase or hyphen formatting, copy individually or in bulk, and download them as a plain-text file. Because everything runs client-side, your generated IDs never leave your device — no logs, no server.

How to use

Set the Count field to how many UUIDs you need (1–100).
Choose formatting options: enable Uppercase and/or disable Hyphens as needed.
Click Generate — UUIDs appear instantly without any network request.
Click the clipboard icon next to any UUID to copy it individually, or use Copy All to grab every UUID at once.
Click Download to save all generated UUIDs as a uuids.txt file.

FAQ

Is this UUID generator free?: Yes, completely free with no account, subscription, or hidden fee required.
Do you upload or store the UUIDs I generate?: No. The tool runs entirely in your browser using the native crypto.randomUUID() API. No data is sent to any server — your UUIDs stay on your device.
Does it work offline?: Yes. After the page loads once, UUID generation works fully offline because everything is client-side JavaScript with no external requests.
What UUID version does this tool generate?: It generates version 4 (v4) UUIDs, which are randomly generated and RFC 4122-compliant. v4 is the most widely used version for unique identifiers in software development.
Can I generate multiple UUIDs at once?: Yes. You can generate between 1 and 100 UUIDs in a single click, then copy all or download them as a text file.
Could two generated UUIDs ever collide?: In practice, no. A v4 UUID carries 122 random bits, so you would need to generate billions per second for a century before a collision became likely. The randomness comes from the browser's cryptographic generator rather than an ordinary one, which is what makes that guarantee meaningful rather than merely hopeful.
Should I use a UUID as a database primary key?: It depends on the trade-off you want. UUIDs let separate systems create records without coordinating, which is their great advantage. The cost is that random values scatter writes across the index instead of appending to the end, which hurts insert performance on large tables - this is why time-ordered variants such as UUIDv7 exist.