About the UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit value, usually shown as 36 characters like 550e8400-e29b-41d4-a716-446655440000. Because they're generated from huge random space, two UUIDs practically never collide — which makes them perfect for database keys, request IDs and file names that must be unique without a central counter.
This generator creates version 4 (random) UUIDs using the browser's cryptographically secure random source. Generate one or many at once and copy them instantly. Everything runs locally.
How to use it
- 1Choose how many UUIDs you want to generate.
- 2Click Generate to create them.
- 3Copy a single UUID, or copy the whole list at once.
- 4Generate again any time you need fresh values.
- 5Paste them into your database, code or test data.
Common uses
- →Creating unique primary keys for database records.
- →Generating request or correlation IDs for logging and tracing.
- →Naming uploaded files so they never clash.
- →Producing unique tokens or identifiers in test data.
- →Assigning stable IDs to items in a distributed system.
Tips & good to know
- Version 4 UUIDs are random — great for uniqueness, but not sortable by time.
- UUIDs are not secret; anyone can generate valid-looking ones, so don't use them as security tokens on their own.
- Store UUIDs as a dedicated type or fixed-length column for efficiency.
Frequently asked questions
- Are these UUIDs really unique?
- Version 4 UUIDs are drawn from such a large random space that collisions are astronomically unlikely, so they're treated as unique in practice.
- Which UUID version does it generate?
- Version 4 (randomly generated), the most common type for keys and identifiers.
- Is generation done on a server?
- No. UUIDs are generated in your browser using a secure random source and nothing is sent anywhere.