UUID Generator (v4)
Generates random, RFC 4122-compliant version 4 UUIDs in bulk. Useful for database primary keys, test fixtures, and dummy IDs. To format or validate JSON that uses the generated UUIDs, try the JSON Formatter as well.
🔒 Runs in your browser · Your data is never sent to a server
Notes
- Generated values are version 4 (random) UUIDs. They use the browser's cryptographic random source, so collisions are practically negligible.
- You can generate 1 to 100 at a time, with or without hyphens and in upper or lower case.
- Version 4 values are not ordered, so consider index efficiency when using them as database primary keys.
Glossary
UUID
Short for Universally Unique Identifier, an identifier designed to be unique across systems worldwide. Commonly used for database primary keys and other cases where uniqueness matters.
RFC 4122
The internet standard that defines how UUIDs are generated. This tool follows "version 4," a randomness-based generation method.
FAQ
What is UUID version 4?
It is a random UUID defined in RFC 4122. It is generated with the browser's cryptographic random source, so the chance of a collision is negligible in practice.
How many can I generate at once?
Up to 100 at a time, and you can choose the format such as with or without hyphens and upper or lower case.
Is it OK to use a UUID as a database primary key?
Yes, but version 4 values are random and unordered, which can reduce index efficiency. Depending on the use case, consider sequential or time-ordered IDs.
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