What does the UUID Generator create?
The KitLumi UUID Generator creates 128-bit identifiers using browser cryptographic randomness. UUID v4 is random; UUID v7 includes a 48-bit Unix-millisecond timestamp so newly generated values sort approximately by time.
How do you generate UUIDs?
- Choose UUID v4 for random identifiers or UUID v7 for roughly time-ordered identifiers.
- Set a count from 1 to 100 and optionally enable uppercase output.
- Select Generate, then copy the newline-separated values.
Should you choose UUID v4 or v7?
| Version | Main input | Ordering | Common use |
|---|---|---|---|
| UUID v4 | 122 random bits | None | General identifiers |
| UUID v7 | Unix milliseconds plus random bits | Roughly chronological | Database keys and event IDs |
Can UUIDs collide?
Collisions are theoretically possible because the identifier space is finite, but correctly generated UUID v4 values have an extremely low collision probability. A UUID is an identifier, not a secret or proof of authorization.
Frequently asked questions about UUID Generator
Are generated UUID v4 values cryptographically random?
Yes. UUID v4 values use crypto.randomUUID when available and otherwise use crypto.getRandomValues with the RFC version and variant bits set.
What is the difference between UUID v4 and v7?
UUID v4 is random. UUID v7 begins with a Unix-millisecond timestamp and is roughly sortable by creation time while retaining random bits.
Can I generate UUIDs in bulk?
Yes. Generate between 1 and 100 UUIDs at once, then copy the newline-separated result.
Does uppercase change a UUID?
No. Hexadecimal UUID text is case-insensitive. Uppercase changes presentation only, not the 128-bit value.
What changed?
Added UUID v4 and v7 generation, bulk output, uppercase formatting, clipboard copy, and UUID version and variant inspection.