UUID generator
Generate one or many UUID v4 identifiers locally in your browser.
Click Generate UUIDs to create identifiers locally.
Guide
UUID Generator: what it does and how to use it
What this Developer tool does
This UUID generator creates random UUID v4 identifiers. UUIDs are useful for database records, test fixtures, request IDs, correlation IDs, React keys in mock data, and any workflow that needs unique-looking identifiers.
How it works
Choose how many identifiers to create and click generate. The browser uses crypto.randomUUID, which is designed for random UUID v4 generation. You can copy a single value or the full list for tests, seed data, or documentation.
Examples
- Generate request IDs for API examples.
- Create IDs for mock database rows.
- Use UUIDs in test fixtures.
Security considerations
UUIDs are identifiers, not secrets. Do not use them as passwords, API keys, or access tokens.
FAQ
What version are these UUIDs?
They are random UUID v4 values generated by the browser.
Are UUIDs guaranteed unique?
Collisions are extremely unlikely, but no random identifier can be mathematically impossible to collide.
Are generated UUIDs sent anywhere?
No. They are generated locally in your browser.