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UUID generator
Random UUID v4 identifiers, one at a time or in bulk, using crypto.randomUUID().
How it works
Generates version 4 UUIDs using crypto.randomUUID() — a browser-native function built specifically for this, rather than assembling one manually from Math.random(), which isn't random enough to guarantee uniqueness at scale.
FAQ
- What does "version 4" mean?
- It's the UUID variant that's fully random (aside from a few fixed bits that identify it as v4) — as opposed to v1, which encodes a timestamp and network address instead.
- How likely is a collision?
- Astronomically unlikely — there are about 5.3 undecillion (5.3×10^36) possible v4 UUIDs, so even generating billions of them the odds of a repeat are effectively zero.
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