Does my data leave this browser?

No. Everything here runs locally in this tab - nothing is uploaded, logged, or sent to a server.

Are these UUIDs actually unique?

Each one is generated with the browser's cryptographically secure random number generator following the UUID v4 spec - collisions are astronomically unlikely (roughly 1 in 2.7 x 10^18 for any two to match).

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UUID Generator

Generate random UUID v4 identifiers instantly

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Frequently asked questions

Does my data leave this browser?: No. Everything here runs locally in this tab - nothing is uploaded, logged, or sent to a server.
Are these UUIDs actually unique?: Each one is generated with the browser's cryptographically secure random number generator following the UUID v4 spec - collisions are astronomically unlikely (roughly 1 in 2.7 x 10^18 for any two to match).