Online UUID Generator — Free UUID v4 Generator
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are widely used in software development for database primary keys, distributed systems, session identifiers, and transaction IDs.
Our UUID generator creates version 4 UUIDs using cryptographically secure random number generation (crypto.randomUUID()). Each UUID is virtually guaranteed to be unique.
Why Use Our UUID Generator?
- Cryptographically secure — Uses the browser's native
crypto.randomUUID()API - Batch generation — Generate up to 50 UUIDs at once
- One-click copy — Click any generated UUID to copy it
- Uppercase option — Toggle between lowercase and uppercase format
How to Use This UUID Generator
- Select the number of UUIDs you need (1-50)
- Optionally toggle uppercase format
- Click Generate
- Click any UUID to copy it to your clipboard
UUID Format
A standard UUID looks like this:
550e8400-e29b-41d4-a716-446655440000
The format is: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is a random hexadecimal digit and y is one of 8, 9, A, or B.
Frequently Asked Questions
Are these UUIDs truly unique?
UUID v4 generates random UUIDs with 122 bits of entropy. The probability of collision is astronomically low — you'd need to generate billions of UUIDs per second for hundreds of years to have a meaningful chance of a duplicate.
Can I use these UUIDs in my database?
Yes. These are standard RFC 9562 UUID v4 identifiers suitable for use as primary keys, API tokens, or any scenario requiring unique identifiers.
Is there a limit on how many UUIDs I can generate?
No. Generate as many as you need, as often as you want, completely free.