UUID Generator
Need unique IDs? Generate RFC 4122 UUID v4 values in one click—ideal for Postgres keys, API mocks, and QA data. Copy instantly, free, no signup. Case Modify runs this tool in your browser—free, private, no signup.
About UUID Generator
The UUID Generator creates RFC 4122 version 4 identifiers for database keys, correlation IDs, file names, and distributed systems that need low collision probability without a central allocator.
How to Use UUID Generator
Click generate to receive a new UUID v4 string. Copy it into your schema migration, API header, or config file. Generate additional IDs as needed for batch inserts.
When to Use UUID Generator
Backend services: Primary keys in microservices before databases auto-assign. Logging: Trace IDs across request chains. Client apps: Temporary device or session identifiers. Testing: Populate fixtures with realistic GUID columns.
Why Use This UUID Generator?
Hand-typing UUIDs is error-prone; v4 generation in the browser is instant and avoids pulling another npm dependency for quick scripts.