Developer and data
UUID Generator
Generate UUID v4, v5, and v7 values in your browser.
Generated UUIDs
A random UUID for general IDs, tokens, and test data.
- 41c53c0a-2ba0-4516-841d-d705772afd74
- 8fbd9748-acc6-41e6-b76a-54171c618178
- 29f393b8-e78d-46d6-88a4-e96231c89890
- 933fce08-0db6-4aac-9b97-e74b43559f3b
- 6a3aa267-8e0d-4fbc-b629-1908b0fa740c
Features of the UUID Generator
Generate UUIDs in your browser for test data, temporary identifiers, configuration files, logs, and database records. Choose random UUID v4, deterministic name-based UUID v5, or time-ordered UUID v7 depending on your use case.
Open detailed notes
UUID v4
A random UUID that works well as a general-purpose identifier.
UUID v5
Generated from a namespace and name. The same input always produces the same UUID.
UUID v7
Includes time information, making IDs easier to sort by creation order.
UUID v7 is defined in RFC 9562. Check compatibility with your existing systems and libraries before using it in production data.
How to choose a UUID version
- Use UUID v4 when you need a random general-purpose identifier.
- Use UUID v5 when the same namespace and name should always produce the same identifier.
- Use UUID v7 when IDs should be easier to sort by creation time.
- For public URLs and logs, check predictability, sorting requirements, and library support before choosing a version.
Common UUID uses
UUIDs are often used as database primary keys, API request IDs, event IDs, test data, and identifiers in configuration files. A UUID is not a replacement for authentication or authorization. Sensitive resources still need proper access control.
Frequently asked questions
Are generated UUIDs stored?
No. Generation and display happen only in your browser.
Can I reproduce the same UUID later?
UUID v4 and v7 produce new values when regenerated. UUID v5 can reproduce the same value when you use the same namespace and name.
Can a UUID replace authentication or authorization?
No. A UUID is an identifier, not access control. Protected resources still need proper authentication and authorization.
Can UUID v7 be used everywhere?
UUID v7 is a newer format. Check support in your existing systems, databases, and libraries before using it.
How many UUIDs can I generate at once?
UUID v4 and v7 can generate 1 to 20 values at a time. UUID v5 produces one deterministic value per input.