UUID Generator
Generated UUIDs
Generate random version 4 UUIDs in bulk, with format options | 100% Private
Uses the browser's native crypto.randomUUID() when available, with an RFC 4122 fallback.
Generate up to 100 UUIDs at once for seeding databases or test data.
Toggle hyphens and letter case to match your target system's requirements.
Copy a single UUID or the entire batch to your clipboard in one click.
UUIDs (Universally Unique Identifiers) are 128-bit values used as unique IDs for database rows, distributed system entities, session tokens, and more — without needing a central authority to avoid collisions. Version 4 UUIDs are generated using random numbers, making them ideal for most general-purpose use cases.
This tool uses crypto.randomUUID(), a built-in browser API backed by a cryptographically secure random number generator. If your browser doesn't support it, a manual RFC 4122-compliant version 4 fallback using crypto.getRandomValues() is used instead — no external libraries required.
No. UUIDs are generated entirely in your browser using the Web Crypto API (crypto.randomUUID), or a cryptographically-seeded fallback. Nothing is sent to any server.
A UUID (Universally Unique Identifier) version 4 is a 128-bit identifier generated using random or pseudo-random numbers. It's practically guaranteed to be unique across systems without central coordination.
You can generate between 1 and 100 UUIDs in a single batch using the quantity selector.
Yes. Use the format options to toggle hyphens on or off, and switch between uppercase and lowercase output.
Yes. When available, generation uses crypto.randomUUID(), the same cryptographically secure API browsers use internally. A manual RFC 4122-compliant fallback is used only if that API is unavailable.