Utility Tool
High Entropy
UUID
Generator
Instantly generate cryptographically secure Version 4 Universally Unique Identifiers (UUIDs) for use in your applications, databases, and APIs.
// Total Uses
179
and counting
// Server Calls
0
Zero. Offline works.
uuid_generator.js
READY
§ Specs
About UUIDs
What is a UUID?
A Universally Unique Identifier (UUID) is a 128-bit number used to
identify information in computer systems. Also known as GUIDs in Microsoft ecosystems.
Version 4 Security
This generator specifically creates v4 UUIDs, which are generated
completely randomly using cryptographically strong pseudo-random number generators (CSPRNG)
like
crypto.randomUUID().Collision Probability
There are 2122 possible v4 UUIDs. The chances of generating the same UUID twice is essentially zero. It's safe to use across distributed databases without synchronization.
? FAQ
Frequently Asked Questions
A Version 4 Universally Unique Identifier (UUID) is a 128-bit number generated randomly, unlike versions 1 or 2 which depend on MAC addresses and timestamps. It is the most common form of UUID used to identify records in databases.
Yes! We generate UUIDs using the Web Crypto API (`crypto.randomUUID()` or `crypto.getRandomValues()`), ensuring high-quality, non-predictable randomness instead of relying on the mathematically predictable `Math.random()`.
While technically possible, the probability is practically zero. You would need to generate 1 billion UUIDs every second for about 85 years for a 50% chance of a single collision.