What is a UUID?
A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. The term "Globally Unique Identifier" (GUID) is also used, mostly in Microsoft systems. When generated according to the standard methods, UUIDs are for practical purposes unique.
This tool generates Version 4 UUIDs. A Version 4 UUID is randomly generated. As such, it does not require a registration authority or coordination between parties generating them, unlike Version 1 (based on MAC address and time).
How to use this Generator?
Using our online UUID generator is straightforward and secure. Follow these steps:
- Single Generation: Simply click the "Generate New" button to create a fresh UUID. Click "Copy" to save it to your clipboard.
- Bulk Generation: If you need multiple IDs for database seeding or testing, enter the desired quantity (up to 500) in the options box and click "Generate Bulk List".
- Formatting: Check "Uppercase" if you need capital letters, or "Remove Hyphens" if you need a raw 32-character string.
Frequently Asked Questions
Is this UUID secure?
Yes, we use the cryptographically secure crypto.randomUUID() method available in modern browsers. This ensures that the random numbers generated cannot be predicted, making them safe to use as session IDs or tokens.
What is the difference between UUID and GUID?
There is no functional difference. GUID (Globally Unique Identifier) is the term used by Microsoft, while UUID (Universally Unique Identifier) is the term used by the Open Software Foundation (OSF). They are usually interchangeable.
Can a UUID v4 be duplicated?
While it is theoretically possible to generate a duplicate, the probability is negligible. To put it in perspective, you would need to generate 2.71 quintillion (2.71 x 10^18) UUIDs to have a 50% chance of creating just one duplicate. For all earthly applications, UUIDs are unique.