UUID v4 & NanoID Generator Online
Generate random UUID v4 values or NanoIDs online for test data and applications. Enforce uniqueness in your own system.
This tool processes its main input in your browser and does not send it to an external API. Fonts and interface assets may load from external providers.
UUID v4 & NanoID Generator Online
A UUID is a fixed-format identifier used to name records across systems. Version 4 is random-based and is commonly useful for test records, database rows and temporary objects.
Generating a UUID alone does not enforce uniqueness in your application. Database constraints and system design still matter, and an identifier is not a substitute for authorization.
How to use it
- Use the bulk button to add five UUID v4 values, or generate a NanoID.
- Copy the identifier you need.
- Check your application's expected format and enforce uniqueness in its database.
Example
Input: Generate a UUID v4
Output: Example shape: 550e8400-e29b-41d4-a716-446655440000
Who is it for?
- Application developers
- Test engineers
- Teams designing API identifiers
Privacy and limitations
The value is generated in this page and is not saved to a Yula server by the generator. Your application's storage behavior is separate.
UUID and GUID: How Unique Identifiers Work
Frequently asked questions
Are UUID and GUID the same?
GUID is a common Microsoft term for identifiers compatible with UUID formats. Check the specific format and version your application expects.
Why does a UUID v4 look random?
Version 4 uses random fields while reserving bits for its version and variant. The generator's random source matters.
Can I use a UUID as a password?
A UUID is an identifier format, not a password or access-token design.
Are collisions impossible?
No. They are very unlikely for UUID v4 but not mathematically impossible. Enforce uniqueness in the database for critical records.