UUID Generator (v4)

UUIDs are widely used as database primary keys, request IDs, idempotency keys, filenames — anywhere you need a globally unique value. This tool uses the browser-native crypto.randomUUID to bulk-generate RFC 4122 v4 random UUIDs, with adjustable count, uppercase and no-hyphens, and one-click copy per item or all.

Everything is cryptographic-grade random and generated locally in your browser, never uploaded. v4 UUIDs are made of random bits with negligible collision probability, fitting almost any need for a unique identifier.

Count5UppercaseNo hyphens

Generated with the browser-native crypto.randomUUID — RFC 4122 v4 random UUIDs, cryptographic randomness, local, never uploaded. Common as primary keys, request IDs, idempotency keys.

Check your exit IP's purity while you're here →

Check your own IP — purity, risk score, native vs datacenter, leaksCheck IP →

FAQ

Are these UUIDs truly random? Will they collide?

Generated from a cryptographic random source (crypto.randomUUID), the collision probability is negligible in practice.

What's the difference between v4 and v1?

v1 is based on timestamp + MAC (which can leak generation time / machine info); v4 is purely random and leaks nothing — the most common version today. This tool generates v4.

Are the generated UUIDs uploaded?

No, everything is generated locally in your browser.