UUID生成

無料のUUID v4ジェネレーター。暗号学的にランダムなRFC 4122 UUID（GUID）を1つずつ、または一括で生成します。ワンクリックでコピーできます。ブラウザ内で動作します。

Runs in your browserUpdated Apr 26, 2026

よくある質問

›Which UUID version is generated?

Version 4 (random) by default, generated with crypto.getRandomValues for true randomness.

›Can I generate many at once?

Yes — pick any count up to 1,000 and copy them all with a single click.

›Are UUIDs really unique?

Practically, yes. The chance of v4 UUID collision is negligible — you'd need to generate billions per second for centuries.

›Is GUID the same as UUID?

Yes. GUID is Microsoft's name for the same RFC 4122 UUID format. They're interchangeable.

›Are the UUIDs sent anywhere?

No — generation happens locally in your browser. Nothing is logged.

›Is the generator free?

Yes — fully free, no signup.