Free UUID / GUID generator (version 4)
This free UUID generator creates cryptographically random version-4 UUIDs — also known as GUIDs — one at a time or in bulk. Choose how many you need, generate up to 500 at once, and copy them all with a single click. Optional uppercase and no-hyphen formats let you match whatever your database or code expects.
How to generate UUIDs
- Set how many UUIDs you want, from 1 up to 500.
- Optionally tick Uppercase or No hyphens to change the format.
- Click Generate, then Copy all to paste the identifiers straight into your project.
What is a UUID v4?
A version-4 UUID is a 128-bit identifier with 122 random bits, written as xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. With that much randomness, collisions are astronomically unlikely, which makes UUID v4 a safe, decentralized way to create unique keys without a central counter.
Common uses
- Database primary keys — assign IDs without coordinating across servers.
- API request and correlation IDs — trace a request through distributed systems.
- Test data and fixtures — generate a batch of unique values in bulk.
- File and object names — avoid clashes in uploads and storage buckets.
Generated locally, never uploaded
Every UUID is produced by your browser's cryptographically secure random number generator — nothing is transmitted or stored. Need other random values? Create a strong secret with our password generator, or fingerprint a file or string with the hash generator.
Need a custom tool or internal utility built for your team? Get in touch with SR Infobiz.