UUID Generator

UUID v4 values are random identifiers designed to be unique without asking a central server for permission. They are useful for database primary keys, event IDs, request tracing, fixture data, cache keys, filenames, distributed systems, and anywhere you need a collision-resistant identifier before saving data.

This generator uses crypto.randomUUID() when available, which relies on the browser cryptography APIs. A secure fallback uses random bytes from crypto.getRandomValues() and sets the UUID version and variant bits correctly. You can generate a single value or create bulk lists for seed data, migrations, tests, and API examples.

The tool runs entirely client-side and does not log generated identifiers. While UUIDs are excellent identifiers, they are not secrets; do not use them as passwords or authorization tokens unless paired with a security design that accounts for entropy, expiration, and access control.