Que fait UUID Generator ?
UUID Generator permet de générer des résultats dans le navigateur et présente clairement le résultat et ses limites. Fonctions vérifiées : UUID v4, UUID v7, Bulk generation up to 100, Version and variant inspection.
Choose v4 for privacy or v7 for locality
Use UUID v4 when identifiers should not expose creation time. Use UUID v7 when approximate time ordering improves database or event-log locality.
Comment l’utiliser ?
- Choose UUID v4 for random identifiers or UUID v7 for roughly chronological identifiers.
- Choose a count from 1 to 100 and optional uppercase display.
- Generate and copy the newline-separated values.
Exemple réel d’entrée et de sortie
Inspect a version-4 identifier
Entrée
550e8400-e29b-41d4-a716-446655440000Sortie
Version: 4
Variant: RFC 4122/9562The version nibble is 4 and the variant bits match the standard UUID layout.
Erreurs fréquentes et corrections
| Symptôme | Cause probable | Correction |
|---|---|---|
| Validation rejects a UUID. | The hyphens, hexadecimal length, version, or variant bits are invalid. | Use the canonical 8-4-4-4-12 hexadecimal layout and a supported version. |
| UUID v7 order is not exact. | Values share a millisecond or were created on clocks with different time state. | Treat v7 as roughly time ordered and keep a separate authoritative timestamp when exact order matters. |
A UUID is not a secret
Limite propre à cet outil : Collisions are theoretically possible but extremely unlikely with correctly generated UUID v4 values. UUIDs identify records; they do not prove authorization or provide secrecy.
Normes et références d’implémentation
- RFC 9562 — UUIDs (opens in a new tab)Defines UUID versions 4 and 7, variants, and layout.
UUID Generator — FAQ
Are UUID v4 values cryptographically random?
Yes. The tool uses crypto.randomUUID or crypto.getRandomValues and sets the RFC version and variant bits.
What is different about UUID v7?
UUID v7 starts with a 48-bit Unix-millisecond timestamp and keeps random bits.
Does uppercase change the value?
No. UUID hexadecimal text is case-insensitive.
Quelles modifications ?
Mise à jour substantielle : UUID Generator: Added UUID v4 and v7 generation, up to 100 values, uppercase display, copy, and version and variant inspection.