UUID Generator

What the UUID Generator does

The UUID Generator creates one or many random version-4 UUIDs — universally unique identifiers — entirely in your browser using the browser's built-in cryptographic random number generator, giving you IDs suitable for database keys, tracking identifiers, or test data.

How to use it

1. Choose how many UUIDs you want to generate.
2. Click Generate UUIDs.
3. Click Copy all to copy the full list to your clipboard.

Common uses

• Generating a batch of unique IDs for seeding a test database.
• Creating a unique identifier for a new database record or object.
• Generating a session or request ID for debugging or logging purposes.
• Producing placeholder unique keys during early-stage development before a real ID scheme exists.
• Creating unique file or resource names to avoid collisions.

Good to know

Version-4 UUIDs are generated from random bits rather than derived from a timestamp or hardware address, so they carry no identifying information about when or where they were created — that's a feature for privacy but means they can't be sorted chronologically the way some other ID schemes can. The chance of two version-4 UUIDs colliding is astronomically small (on the order of 1 in 2^122), which is why they're trusted as unique without a central coordinating authority.

UUIDs solve a coordination problem that's harder than it looks: generating unique identifiers across many different systems, servers, or even offline devices without any central authority keeping track of what's already been used. Version 4 UUIDs solve this through sheer statistical improbability — with 122 random bits, the odds of two randomly generated UUIDs colliding are so astronomically small that systems can treat uniqueness as guaranteed in practice, without needing a database lookup to check.