UUID Generator
Generate v4 UUIDs in bulk.
5 UUIDs
About the UUID Generator
Generate RFC 4122 version 4 UUIDs one at a time or in bulk, using your browser's cryptographically secure random source. Perfect for database keys, request IDs and anything that needs a unique identifier.
How to use it
- 1Choose how many UUIDs you need.
- 2Generate them instantly — each is a random v4 UUID.
- 3Copy a single value or the whole list.
Why developers reach for UUIDs
When two systems both need to create identifiers without talking to each other — a mobile app generating records offline, several servers inserting rows at once — sequential numbers clash. UUIDs solve this: because each one is a random 128-bit value, any machine can mint an ID with a vanishingly small chance of ever colliding with another. They're the standard choice for database primary keys, request and trace IDs, idempotency keys and file names. Generating them in bulk here is handy for seeding test data.
Common uses
- Assigning primary keys to database records created across multiple services.
- Generating request or correlation IDs for logging and tracing.
- Creating a batch of unique identifiers for test or seed data.
Frequently asked questions
- Are these UUIDs unique?
- Version 4 UUIDs are random 128-bit values; the chance of a collision is astronomically small, so they're safe to treat as unique.
- What is a version 4 UUID?
- It's a universally unique identifier whose bits are almost entirely random, rather than derived from a timestamp or MAC address. That makes it easy to generate anywhere without coordination and without leaking information about the machine that created it.