UUID / GUID Generator
Create one or many UUIDs instantly for databases, APIs, tests, and development projects.
Complete Guide & FAQ
What is the UUID / GUID Generator?
It generates universally unique identifiers (UUID v4) instantly, one at a time or in batches, for use as primary keys, session IDs, unique filenames, or any case where you need a practically non-repeating identifier.
What it does
- Batch generation: 1 to 20 UUIDs at a time.
- Cryptographically secure randomness: uses the native crypto.randomUUID API, with a compatible fallback for older browsers.
- Copy all at once: results are listed one per line, ready to copy.
Frequently Asked Questions (FAQ)
Which UUID version does it generate?
It generates UUID version 4, meaning fully random identifiers (not based on a timestamp or MAC address), using the browser's crypto.getRandomValues to ensure cryptographically secure randomness.
Can two identical UUIDs be generated by chance?
It's statistically negligible: a v4 UUID has 2^122 possible combinations, so the collision probability is effectively zero even when generating billions of IDs.
What's the difference between UUID and GUID?
They're the same concept (a 128-bit unique identifier) with different names: UUID is the term used across most languages and standards, while GUID is the name Microsoft uses in its ecosystem (.NET, Windows).