Questions About This Tool
Are these UUIDs safe to use as database keys?
Yes. Version 4 is the common default, and version 7 is usually the better choice for a primary key because time-ordered values keep the index compact. Both come from the platform cryptographic generator here.
Can a UUID be used as a password or API key?
It is a poor fit. A version 7 UUID reveals when it was created, and even a version 4 is a fixed format that tells an attacker exactly what shape to expect. Generate a password when the value has to resist guessing.
Will two people using this page ever get the same UUID?
Not in any practical sense. Version 4 draws 122 random bits from a cryptographic generator; the realistic causes of duplicate identifiers are copied fixtures and restored snapshots, not the randomness.
Why does my UUID have a 7 where others have a 4?
That character is the version field. A 4 means the value is random; a 7 means the first 48 bits are a millisecond timestamp. Paste any identifier into the inspector to read its version.
Is version 7 a real standard?
Yes. RFC 9562 published in May 2024 replaced RFC 4122 and defines versions 6, 7, and 8 alongside the older ones.