Randomizers
UUID Generator
Generate universally unique identifiers for development, testing, and data workflows.
Example output
Example: 550e8400-e29b-41d4-a716-446655440000
How it works
Choose how many UUIDs you need, select the output format, then generate a fresh set of random UUID v4 values.
Useful for
- Creating test records
- Seeding development data
- Naming API resources
A quick tip
Generate a fresh UUID for every record that needs a stable public identifier; do not reuse one across unrelated entities.
What is a UUID?
A UUID is a 128-bit identifier used to label records, events, files, and API resources without relying on a central counter.
UUID v4 format
This generator creates random UUID v4 values using Ruby's secure random generator, then formats them for the output style you choose.
Common UUID formats
Use the standard lowercase format for most databases and APIs. Choose uppercase, no-hyphen, or URN output only when another system expects that exact representation.
FAQ
What version of UUID does the UUID Generator create?
It creates random UUID v4 values, which are widely supported by databases, APIs, test fixtures, and application code.
Can I remove hyphens from a UUID?
Yes. Choose the no-hyphen format when a system expects a compact 32-character UUID string.
Are generated UUIDs safe to use in production?
UUID v4 values are designed to be highly unlikely to collide. They are useful for public identifiers, but you should still follow your database and security requirements.