UUID Generator
Generate one or many random version-4 UUIDs, ready to copy.
What a UUID v4 is
A version-4 UUID is 122 bits of randomness formatted as a 36-character string, used as a unique identifier for database rows, sessions, or files without needing a central authority to hand out IDs. Collisions are astronomically unlikely.
About the UUID Generator
The UUID Generator creates random version 4 UUIDs, which are 128-bit identifiers written as 32 hexadecimal digits in groups, such as 123e4567-e89b-42d3-a456-426614174000. Developers use them as database keys, request IDs and file names.
UUID v4 values are made from random numbers, and the number of possible values is so large that accidental duplicates are extremely unlikely. They are generated with your browser's cryptographic random source. A UUID is an identifier, not a secret, so do not use it as a password or access token unless your system is designed for that. You can choose lowercase, uppercase, no hyphens or braces to match different systems.
How to use it
- Enter how many UUIDs you need.
- Choose a format.
- Press Generate.
- Press Copy all.
Tips and good to know
- Store UUIDs as native types in databases when possible.
- Random UUIDs are not sorted by creation time.
- Use the same case consistently.
Frequently asked questions
Can two UUIDs be the same?
It is possible in theory but practically never.
What does the 4 mean?
It marks version 4 (random).
Is it secure?
Good for identifiers, not for secrets.