UUID Generator (v4 and v7)
Generate one or thousands of UUIDs - v4 random or v7 time-ordered
v4 is fully random. v7 embeds a millisecond timestamp so IDs sort chronologically - ideal for database primary keys.
使い方
- 1Pick a version
v4 is fully random. v7 embeds a timestamp so IDs sort chronologically - ideal for database keys.
- 2Set the count
Generate 1 UUID or up to 1,000 at once for seeding databases or test data.
- 3Copy them
Click Copy all to send the list to your clipboard, one per line.
UUID Generator (v4 and v7) について
Free online UUID generator. Create RFC 4122 v4 (fully random) or v7 (time-ordered) UUIDs, one at a time or up to 1,000 in bulk. Uses the browser's cryptographic random source. Runs entirely in your browser. 712 Tools の UUID Generator (v4 and v7) はモダンな JavaScript API を使って完全にブラウザ内で動作します - サーバーがあなたのデータを見ることは一切ありません。つまり、即時の結果、完全なプライバシー、アップロード制限なしです。
デバッグ、簡単な確認、あるいは本番のインシデント対応まで - このツールは何度でも無料で使えます。ウォーターマークなし、サインアップなし、ツール内広告なし。
よくある質問
What's the difference between v4 and v7?
v4 is 122 bits of randomness. v7 puts a 48-bit millisecond timestamp in the first bytes, so IDs are sortable by creation time - much better for database primary keys.
How random are these?
They use window.crypto.getRandomValues, the same source used for TLS keys. Not Math.random.
Are the UUIDs stored?
No. They're generated and displayed locally - nothing is sent to any server.
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