About UUID Generator (v4)
Generate random UUIDs (Universally Unique Identifiers) instantly — version 4 identifiers suitable for database keys, request IDs, and anywhere you need a collision-free unique value.
How to Use
- Choose how many UUIDs you need.
- Generate them with one click.
- Copy a single UUID or the whole list.
- Regenerate any time for a fresh set.
Why Use This Tool?
- Accurate — built on precise, well-tested mathematical formulas.
- Instant — all calculations happen client-side for zero latency.
- Private — no data is sent to any server; your information stays on your device.
- Free — no sign-up, no limits, no hidden costs.
Frequently Asked Questions
What is a UUID v4?
A version-4 UUID is a 128-bit identifier generated from random numbers, written as 32 hex digits in five groups (8-4-4-4-12), e.g. 550e8400-e29b-41d4-a716-446655440000.
Are UUIDs truly unique?
Collisions are astronomically unlikely — you would need to generate billions of UUIDs per second for many years to have any realistic chance of a duplicate, so they are treated as unique in practice.
Can I use a UUID as a database primary key?
Yes. UUIDs are great when you need to generate IDs on the client or across distributed systems without coordination, though sequential integer keys can be more index-friendly for very large tables.