UUID Generator
Generate Version 4 UUIDs instantly
What is a UUID and Why is it "Universal"?
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. The beauty of a UUID lies in its decentralized nature: you can generate an identifier without consulting a central authority or database, with a statistical guarantee that it will be unique across the globe.
UUID Version 4: The Power of Randomness
Our tool specifically generates UUID v4. Unlike v1 (which uses MAC addresses and timestamps), version 4 is almost entirely based on high-entropy random numbers. Out of 128 bits, 122 are purely random, resulting in 2122 (or 5.3 undecillion) possible combinations.
What is the chance of a collision?
To have a 50% chance of a single collision, you would need to generate approximately 1 billion UUIDs per second for 85 years. In practice, for any human software system, treating them as globally unique is a secure and widely accepted standard.
Common Use Cases
- Primary Keys (PK): Replacing sequential IDs in databases to prevent exposing record counts and to simplify data merging.
- Distributed Systems: Generating IDs on different servers or offline clients without the risk of duplicates during synchronization.
- Filenames: Ensuring that file uploads from different users do not overwrite each other on a server.
Total Privacy (Local-Only)
At Octovelo, ID generation utilizes the native crypto.randomUUID() function of your browser. None of the generated UUIDs are sent to or stored on our servers. The process is 100% private, secure, and instantaneous.