UUID Generator
Generate random UUIDs (v4) in bulk with options for case and hyphen formatting.
How to Generate UUIDs
Click Generate to create one or more version 4 UUIDs instantly. Set the count (1 to 100), choose uppercase or lowercase, and toggle hyphens on or off. Each UUID in the list has its own copy button, and a Copy All button grabs the entire batch separated by newlines. Version 4 UUIDs are randomly generated and provide 122 bits of entropy, making collisions astronomically unlikely. The generation uses the browser's crypto.getRandomValues() API for cryptographically secure randomness.
What Are UUIDs Used For?
Universally Unique Identifiers are used as primary keys in databases, correlation IDs in distributed systems, file names for uploads, and session tokens. Their randomness means you can generate IDs on any device without coordination and still avoid collisions. Version 4 is the most common variant and is suitable for the vast majority of use cases. If you need time-ordered IDs, consider UUIDv7 (not yet supported here). All generation happens in your browser — no server is involved, and no IDs are stored or logged.