Developer Essentials · Free Tool
UUID Generator
Generate cryptographically-random version‑4 UUIDs — one or in bulk — with uppercase, no-dashes, braces and quoted-list formatting. Uses the browser's secure random source; nothing is uploaded.
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How many
How it works
A version‑4 UUID is 122 random bits with a fixed version and variant — about 5.3×1036 possibilities, so collisions are effectively impossible. These are generated with crypto.randomUUID(), which draws from the operating system's cryptographically-secure random source, entirely on your device.