UUID Generator

Generate UUIDs in v1, v4, or v7. One at a time or batches up to 1,000. Copy individual values, copy the whole batch, or download as a text file.

100% Free
No Signup
Works on Mobile
Browser-side

Everything runs in your browser — input never reaches our servers.

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Version

Count (1–1000)

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Picking a UUID version

v4 is the safe default for most cases — fully random, opaque, no metadata leaks. v7 is the modern choice for new systems: same opacity but sortable by creation time, which makes it ideal as a database primary key. v1 is legacy — it embeds the timestamp and a node identifier, which is rarely what you want today.

Privacy

All randomness comes from the browser's WebCrypto API. UUIDs never leave your device — generation runs entirely client-side.

Frequently asked

Questions about this tool

Is the UUID generator free?

Yes — free with no signup or limits. Generate single UUIDs or batches of up to 1,000 at once.

What's the difference between v1, v4, and v7?

v1 is timestamp + machine identifier (sortable but leaks info). v4 is random (most common, opaque). v7 is timestamp-prefixed random (sortable and opaque, the modern default for new systems).

Are the UUIDs cryptographically secure?

v4 and v7 use the browser's WebCrypto random source. v1 uses a JavaScript-generated node ID since browsers don't expose hardware MAC addresses.

Can I download the batch?

Yes — export the generated UUIDs as a plain text file (one per line) or copy them to the clipboard.

Should I use v7 in new code?

Almost always yes. v7 is sortable by creation time (great for database primary keys), opaque enough to leak nothing meaningful, and supported by every modern UUID library.

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