What is a UUID / GUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. When generated according to standard methods, UUIDs are practically unique without requiring a central authority or coordination between the parties generating them.
The term GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. For all practical developer purposes, GUIDs and UUIDs are the same thing.
Difference Between UUID Version 4 and Version 1
- UUID v4 (Randomly Generated): Created using cryptographic random or pseudo-random numbers. It is the most common version used in modern applications because it exposes no timing or hardware data. The chance of a collision is infinitesimal.
- UUID v1 (Time & MAC Based): Generated using the host computer's MAC address and the current timestamp. While this guarantees uniqueness, it does leak the host computer's MAC address and creation time, which might raise privacy concerns.
Key Features of Our Online Generator
- Bulk Generation: Generate up to 500 unique keys at once.
- Custom Formats: Toggle hyphens (32-character vs 36-character formats) and letter case matching your exact developer specifications.
- 100% Client-Side: All generations are processed directly in your web browser via standard mathematical routines, meaning your data never leaves your computer.
Need to encode or decode payloads? Try our Base64 Encoder/Decoder. If you need hash creation, check out our SHA-256 Generator or MD5 Hash Generator.
