UUID Generator

How it works

This tool generates version 4 (random) UUIDs directly inside your browser tab using crypto.randomUUID(), the same cryptographically secure random generator browsers use for security-sensitive APIs — not a weaker pseudo-random fallback. Each UUID has 122 bits of randomness, making accidental collisions practically impossible even at huge scale.

Generate one at a time or up to a thousand at once, optionally in uppercase or without the hyphen separators, for whatever format your database, API, or code expects. UUIDs are commonly used as unique identifiers for database rows, API resources, distributed system events, and session tokens — anywhere you need an identifier that's unique without a central coordinator handing out sequential numbers.

Limitations

This generates version 4 (random) UUIDs only — not version 1 (timestamp-based), version 5 (namespace-based), or the newer version 7 (sortable, timestamp-prefixed) variants. The 1,000-per-batch cap is just to keep the output readable; refresh and generate again for more.

FAQ

Is this UUID generator really free?

Yes — completely free, with no limits and no account required. UUIDs are generated locally in your browser.

What version of UUID does this generate?

Version 4 (random) — the most common kind, generated using your browser's built-in cryptographically secure random number generator (crypto.randomUUID()), not a weaker Math.random()-based one.

How likely is a collision?

Astronomically unlikely. A v4 UUID has 122 random bits — you'd need to generate around a billion UUIDs a second for a trillion years before a 50% chance of any collision.

Are these generated UUIDs sent anywhere?

No — everything happens locally using your browser's own APIs. Nothing is ever sent over the network.