UUID Generator

Batch-generate RFC 4122 v4 random UUIDs from a cryptographically secure source.

What this tool does

Generates RFC 4122 UUID v4 identifiers with one click, in the familiar form 550e8400-e29b-41d4-a716-446655440000. Of the 128 bits in a v4 UUID, 122 come from a cryptographically secure random source (crypto.getRandomValues), so machines can mint IDs independently with no central coordinator and no realistic chance of collision.

Typical use cases

Database primary keys: auto-increment IDs need central coordination in distributed systems, while UUIDs let every node generate keys locally and merge freely. Temporary React list keys; renaming uploaded files to prevent collisions and guessing; idempotency keys, trace IDs, and session identifiers. Whenever you need “unique enough, not sequential”, UUID is the default answer.

Caveats

How unlikely is a collision? Generating a billion UUIDs per second for about 100 years gives a ~50% chance of a single duplicate — effectively never in engineering terms. But a UUID is not a secret key: 122 bits is plenty for an ID yet below what a real encryption key needs, so use a dedicated random string for security tokens. Also, random UUIDs fragment B-tree indexes; very large tables may prefer sortable variants like ULID.