🪪 UUID Generator

Generate UUID v4 or v7 identifiers in bulk — copy individually or all at once.

FAQ

What is the difference between UUID v4 and v7?
v4 is purely random — all 122 bits are random, giving no ordering information. v7 encodes a 48-bit millisecond timestamp in the first 6 bytes so UUIDs generated in the same millisecond are monotonically ordered. v7 is better for database primary keys where sequential insert order matters.
Is UUID v4 cryptographically secure?
Yes. The tool uses crypto.randomUUID() which is backed by the browser's cryptographically secure PRNG — the same source as crypto.getRandomValues().
Does the UUID v7 implementation follow the RFC?
Yes. It follows RFC 9562, encoding 48-bit millisecond timestamp, 4-bit version (7), 12-bit sequence counter for same-millisecond monotonicity, 2-bit variant, and 62-bit random bits.
Are these UUIDs unique?
With overwhelming statistical probability. The random bits in v4 give a collision probability of about 1 in 5.3 × 10^36 per pair. v7 adds a timestamp prefix making same-millisecond collisions even rarer. For practical purposes, treat them as unique.
Do any UUIDs leave my browser?
No. Generation uses only browser-native APIs (crypto.randomUUID, crypto.getRandomValues) and happens entirely locally — no server, no network, no tracking.

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