UUID Generator
Generate random UUID v4 identifiers for apps, databases, fixtures, tests, and prototypes. Create up to 50 IDs at once with simple formatting options.
Privacy & Security
All files are processed locally in your browser. Your data never leaves your device and is not uploaded to any server. We do not store, collect, or have access to your files.
How It Works
- 1
Choose how many UUIDs to generate
- 2
Optionally switch to uppercase or remove hyphens
- 3
Generate cryptographically strong random UUID v4 values
- 4
Copy the full list for use in code, databases, or test data
Use Cases
Create IDs for database records and seed data
Generate request IDs, correlation IDs, and trace IDs
Prepare unique values for tests and fixtures
Create placeholder IDs for mock APIs and prototypes
Generate GUID-style identifiers for cross-system references
Frequently Asked Questions
What UUID version does this tool generate?
It generates random UUID v4 values using browser cryptography APIs.
Can I generate multiple UUIDs at once?
Yes. You can generate between 1 and 50 UUIDs in one batch.
Are these UUIDs stored?
No. UUIDs are generated locally in your browser and are not saved by AppUo.
Can I remove hyphens?
Yes. The tool includes options for uppercase output and hyphen-free output.
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