Is my data uploaded to a server?

No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

How many UUIDs can I generate at once?

Type a count between 1 and 100 in the input. Each UUID appears on its own line, ready to copy or download.

Are these UUIDs cryptographically random?

Yes. They come from crypto.randomUUID(), the browser’s cryptographically secure generator — not from Math.random().

100% local — your data never leaves your browser

UUID v4 Generator — Free Online Tool, No Tracking

Generate one or many random UUID v4 identifiers in your browser, using the cryptographic Web Crypto API. Free, private, nothing leaves your device.

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Count input

UUID output

Why generate UUIDs here?

Test fixtures, database seeds and API keys all need fresh identifiers. Type how many you want above and get RFC 4122 version 4 UUIDs instantly — no install, no tracking.

How it works

Each identifier comes from the browser’s crypto.randomUUID(), which uses a cryptographically secure random source. Enable the Uppercase option if your convention requires capital hexadecimal letters.

Frequently asked questions

Is my data uploaded to a server?: No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
How many UUIDs can I generate at once?: Type a count between 1 and 100 in the input. Each UUID appears on its own line, ready to copy or download.
Are these UUIDs cryptographically random?: Yes. They come from crypto.randomUUID(), the browser’s cryptographically secure generator — not from Math.random().