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.
Is it private?
Yes — completely. Each UUID is generated on your own device using the browser’s nativecrypto.randomUUID(), which draws on a cryptographically-secure random source. Nothing is sent to a server, nothing is logged, and nothing is stored. You can confirm this by opening the tool and then disconnecting from the internet — it keeps working, because there’s no server involved at all.
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.