UUID Generator
Generate random UUIDs (version 4). Batch generate multiple UUIDs at once.
Tool guide
About UUID Generator
UUIDs are widely used as identifiers for records, test data, database rows, fixtures, API examples, and distributed systems. This generator creates random UUID values that are convenient for development and testing.
Use UUIDs when you need identifiers that are unlikely to collide without coordinating a central counter. For security-critical identifiers, still review your application threat model.
Common use cases
- Generate IDs for mock data or seed scripts.
- Create identifiers for API examples and documentation.
- Prepare test values for database records.
- Batch generate random IDs for development workflows.
Practical tips
- Do not rely on user-visible IDs alone for authorization.
- Use stable generated IDs in fixtures when tests need reproducible snapshots.
- Batch generation is useful for CSV or JSON test data.
Related tools
Frequently asked questions
What is a UUID?
A UUID is a standardized identifier format designed to be unique enough for distributed systems and application data.
Can UUIDs collide?
Random UUID collisions are extremely unlikely, but no random identifier is mathematically impossible to collide.
Should I expose UUIDs in URLs?
It is common to expose UUIDs in URLs, but authorization must still be enforced separately.
Is UUID Generator free to use?
Yes. UUID Generator is free to use in your browser with no signup required.
Is my data uploaded when I use UUID Generator?
Most FreeTools utilities process data locally in your browser. Tools that call third-party services, such as IP lookup and advertising, are disclosed in the privacy policy.
What can I use UUID Generator for?
Generate random UUIDs (version 4) online. Batch generate multiple UUIDs at once. Free tool, no signup required.