UUID Generator
Generate UUID v4, UUID v7, ULID and Nano ID in bulk, and validate any UUID to see its version and embedded time.
Generate IDs
Fully random. The most common kind of UUID.
1 to 1,000
Shortcut: Ctrl/⌘ + Enter to regenerate
Validate and inspect
How to use
- Pick a type: UUID v4, UUID v7, ULID or Nano ID.
- Set how many you need. UUIDs can be uppercase, without hyphens or in braces; Nano IDs take a length and alphabet.
- IDs appear right away. Click “Regenerate” or press Ctrl/⌘ + Enter for a fresh batch.
- Click “Copy all” or “Download” to get them, one per line.
- To check an existing ID, paste it under “Validate and inspect” to see its version, variant and embedded time.
FAQ
Are the IDs uploaded or logged?
No. Every ID is created in your browser with the Web Crypto secure random generator. Nothing is sent to a server or stored.
Should I use UUID v4 or v7?
v4 is fully random and fine for most uses. v7 starts with a millisecond timestamp, so newer IDs sort after older ones, which keeps database indexes efficient. RFC 9562 recommends it for new systems.
What is the difference between a UUID and a GUID?
They are essentially the same. GUID is Microsoft’s name for a UUID, often written in uppercase with braces, like {017F22E2-79B0-7CC3-98C4-DC0C0C07398F}.
When should I use ULID or Nano ID?
ULID is time-sortable like UUID v7 but only 26 characters and case-insensitive. Nano ID is even shorter and URL-friendly, handy for short links or invite codes.
Can I get duplicates?
A UUID v4 has 122 random bits. Even at a billion IDs per second, it would take about 85 years to reach a 50% chance of a single duplicate. v7 and ULID IDs in one batch are also guaranteed to be strictly increasing.
What is the “embedded time” in the inspector?
UUID v1, v6, v7 and ULID store the time they were created. The inspector turns it back into a date. v4 is purely random, so it has no time.
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