Generate UUID v4 values instantly.
How does UUID Generator work?
UUID Generator creates a version 4 (random) UUID using your browser's cryptographically strong random number source, the standard format used for unique identifiers in databases and APIs.
How to use it
- Click "Generate UUID".
- Copy the value shown.
- Click generate again for as many unique IDs as you need.
Common use cases
- Creating primary key values while prototyping a database schema.
- Generating unique mock IDs for test data.
- Creating a unique filename or session identifier.
Frequently asked questions
How likely is a collision between two generated UUIDs?
Extremely unlikely — a v4 UUID has 122 random bits, making accidental duplicates practically impossible even across billions of IDs.
Does this work in every browser?
It relies on the browser's built-in crypto.randomUUID API, supported in all modern browsers.