UUID Generator
Generate one or hundreds of UUID v4 values. Choose from standard, no-hyphens, uppercase, or braces format. Click any UUID to copy it.
Count:
Quick single UUID
Click Generate ↑
UUIDs in test automation
UUID v4 values are the standard choice for test data IDs because they are statistically guaranteed to be unique and require no coordination with a database. Use them as id fields in POST request bodies, as correlation IDs in test logs, or as unique identifiers in test fixture files.
The no-hyphens format is commonly required by databases that store UUIDs as 32-character hex strings. The braces format is used by Microsoft SQL Server and .NET applications. Uses the browser's crypto.randomUUID() API for cryptographically secure randomness.