How to generate UUIDs
- Enter how many UUIDs you need (anywhere from 1 to 100).
- Optionally tick UPPERCASE if your system expects upper-cased hex.
- Click Generate, you’ll get one UUID per line in the result box.
- Hit Copy to grab the whole list and paste it wherever you need it.
What is a UUID?
A UUID (Universally Unique Identifier), sometimes called a GUID on Microsoft platforms, is a 128-bit value written as 32 hexadecimal digits in the familiar 8-4-4-4-12 pattern, for example3f2504e0-4f89-41d3-9a0c-0305e82c3301. This tool produces version 4 UUIDs, which are built almost entirely from random data. Of the 128 bits, 6 are fixed to mark the version and variant, leaving122 random bits, enough that you can generate them freely without any central coordination and still never realistically see a collision.
Developers reach for UUIDs as database primary keys, request and trace IDs, file names, idempotency keys, and anywhere two systems need to mint identifiers independently without clashing. Because a v4 UUID is purely random, it doesn’t leak timestamps, counters or machine details the way some other schemes can.
Frequently asked questions
What’s the difference between a UUID and a GUID?
They’re the same thing. “GUID” is Microsoft’s term; “UUID” is the term used in the relevant standards. The format and guarantees are identical.
Can I generate more than 100 at once?
This tool caps each batch at 100 to keep the output readable and fast. Generate again to create more, every batch is independent and random.
Should I use upper or lower case?
The standard form is lowercase, and most systems accept either. Use the UPPERCASE option only if a specific platform or API requires it.
Are these suitable for security tokens?
A v4 UUID has 122 bits of randomness, which is strong, but it’s an identifier, not a secret. For passwords or API secrets, use a dedicated generator and treat the value as confidential.