UUID generator — version 4 random IDs in your browser

Random UUID v4 generator that runs entirely in your browser.

UUIDs are the glue of modern systems: primary keys, correlation IDs, idempotency tokens, file names, distributed locks. This generator produces version 4 (random) UUIDs using your browser's crypto.getRandomValues — no network round-trip, no server logs of generated values. Generate one at a time or in bulk, click any value to copy, and pin the tool to your sidebar so you're one shortcut away when you need an ID for a test fixture, a Postgres seed, or a feature flag key. UUIDs are 128 bits of randomness which means collisions are practically impossible — about 1 in 2.71 quintillion for v4 — so you can sprinkle them freely across your codebase.