Curated picks
UUID generator
One click produces cryptographically strong random IDs when the platform supports them.
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UUID generator
Generates version 4 UUIDs (random) using the browser’s crypto API — suitable for local IDs and test data.
What a UUID is
A UUID is a 128-bit identifier, usually written in hex with hyphens. Version 4 means the bits come from a random or pseudo-random source per RFC 4122.
Good uses
Use UUIDs for request correlation, database primary keys when you do not need sequential IDs, and test fixtures. Combine with server-side validation — do not rely on obscurity alone for authorization.
Privacy
Values are created locally; copy them only where you intend.