🆔 UUID Generator
生成 universally unique identifiers — offline and secure
🔒 画像がデバイスの外に出ることはありません。 すべての処理はWeb Crypto API (crypto.randomUUID)を使用してブラウザ内でローカルに行われます。アップロード、サーバー、追跡は一切ありません。
特長
- Instant v4 UUIDs — 生成 RFC 4122 compliant version 4 UUIDs with a single click.
- Bulk Generation — 生成 up to hundreds of UUIDs at once for batch operations.
- UUID Validator — Paste any UUID to check its validity and detect its version.
- Format Options — Output in standard, uppercase, no-hyphens, or braces format.
仕組み
- Click 生成 — Get a new v4 UUID instantly. Click again for another.
- Choose format — Select standard, uppercase, no-hyphens, or braces format.
- Bulk generate or validate — 生成 multiple UUIDs at once, or paste an existing UUID to validate it.
活用例
- 生成 unique IDs for database records
- Create correlation IDs for distributed systems
- 生成 test data with unique identifiers
- Validate UUIDs from APIs or logs
よくある質問
What is a v4 UUID?
A version 4 UUID is a 128-bit identifier generated from random numbers. The probability of a collision is astronomically low — about 1 in 2^122.
Are these UUIDs truly random?
Yes. We use crypto.randomUUID() or crypto.getRandomValues() which provide cryptographic-quality randomness.
Can I validate any UUID version?
The validator checks the format of any UUID and detects the version (v1 through v5) based on the version nibble.
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