Which version should I choose?

Use v4 for random IDs, v7 for roughly time-ordered values, and v1 only when its timestamp-based legacy layout is required.

Does v1 expose my MAC address?

Not here. A random multicast node value is used rather than a hardware network address.

Do format controls regenerate values?

No. Case, hyphens, braces and quotes alter presentation only.

Can inspection prove uniqueness?

No. It validates structure and metadata, but global uniqueness cannot be proven from one identifier.

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UUID Generator

Create secure random, time-sortable or timestamp-based UUIDs in bulk and inspect the structure of existing identifiers.

Settings

Version

Quantity

Case

Generated UUIDs

Generate a UUID to see it here.

Inspect UUID

Validate a UUID and inspect its canonical structure, version, variant, and timestamp when available.

Your data is processed locally in your browser and is not uploaded.

How to use UUID Generator

1
Choose UUID v4, v7, v1 or Nil.
2
Set a quantity up to 1000 and select formatting.
3
Click Generate to create fresh identifiers.
4
Copy one value or export TXT or CSV.
5
Use Inspect UUID to view canonical form, version, variant and an available timestamp.

Frequently asked questions

About UUID Generator

UUID versions serve different constraints. V4 uses browser cryptographic randomness, v7 places a Unix-millisecond timestamp before a large random portion, and v1 follows a timestamp-and-sequence structure without exposing a real MAC address. Nil is the fixed all-zero sentinel.

Bulk generation and formatting remain separate, while the inspector normalizes common forms and reports version-specific information only when reliable. No identifier is registered or uploaded.