Generatore di UUID v4 online — gratis e in massa
Genera identificatori UUID v4 crittograficamente casuali nel browser. Utile per chiavi primarie, idempotency token e ID univoci.
Clicca Genera per produrre un nuovo UUID v4 con crypto.randomUUID(). Quanti ne servono — niente viene registrato.
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Casi d'uso comuni
- 1Pre-generate IDs for database records before you have an INSERT round-trip.
- 2Create idempotency keys for retry-safe API calls.
- 3Stamp upload filenames so two simultaneous uploads cannot collide.
Domande frequenti
Is this UUID v4 or v7?+
v4 — fully random with 122 bits of entropy. It does NOT sort by time. If you need time-ordered IDs use UUID v7 or ULID instead.
How unlikely is a collision?+
Generating 1 billion UUIDs per second for 100 years still leaves less than a one-in-a-billion collision chance. Practically zero for any sensible workload.
Are these UUIDs cryptographically random?+
Yes. crypto.randomUUID() uses the OS CSPRNG (/dev/urandom on Linux, BCryptGenRandom on Windows, SecRandomCopyBytes on macOS).