UUID Generator

What the UUID generator does

A UUID (universally unique identifier) is a 128-bit value written as 36 characters, like f47ac10b-58cc-4372-a567-0e02b2c3d479. This tool generates version 4 UUIDs — the random variant — one at a time or in bulk (up to 50), with an uppercase/lowercase toggle and one-click copy. Generation uses your browser's cryptographic random source.

How to generate UUIDs

1. Click generate for a single UUID, or set a count for a batch.
2. Toggle case if your system expects uppercase.
3. Copy one, or copy the whole list at once.

Why UUID v4?

UUID v4 is random, so any machine can mint one with no coordination and no central authority — ideal for database primary keys, request IDs, and idempotency keys in distributed systems. With 122 random bits, the odds of two colliding are negligible for any realistic volume, which is why "just use a v4" is the default answer for unique IDs.

Need time-ordered IDs? UUIDv7 embeds a Unix timestamp — decode one with the timestamp converter. Auditing a codebase for leaked secrets instead? Try the API key detector.