UUID Generator
Generate UUIDs, ULIDs, NanoIDs and more
About UUID Generator
Generate UUID v4, ULID, NanoID, short IDs, and hex strings. Create up to 500 unique identifiers at once, copy individually, or export as CSV.
- Generates UUID v4, ULID, NanoID, and short IDs
- Batch generate up to 500 unique identifiers at once
- Export all generated IDs as a CSV file
- Click any ID to copy it individually
- Uses cryptographically secure random generation
Everything runs in your browser — your data never leaves your device.
How to Use UUID Generator
- Select an ID format from the dropdown (UUID v4, ULID, NanoID, etc.)
- Set how many IDs to generate (up to 500)
- Click Generate, then click any ID to copy it
- Use Copy All or Export CSV to save your IDs
Frequently Asked Questions
What is a UUID and what is it used for?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hex digits in 5 groups (e.g., 550e8400-e29b-41d4-a716-446655440000). It's used for database primary keys, session tokens, and anywhere a unique ID is needed without a central authority.
Are generated UUIDs truly unique?
Yes, for practical purposes. UUID v4 uses cryptographically secure random numbers, giving 2^122 possible values. The chance of a collision is astronomically small — you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one duplicate.
What is the difference between UUID v1 and v4?
UUID v1 includes a timestamp and MAC address, so it's sortable by time but reveals device info. UUID v4 is fully random and more private. Most modern applications prefer v4.
Can I use UUIDs as database primary keys?
Yes, and it's a common practice. UUIDs allow distributed systems to generate IDs without coordination. The trade-off is slightly larger storage (16 bytes vs 4-8 for integers) and non-sequential ordering.
