Free UUID Generator
Generate universally unique identifiers (UUIDs). Supports Version 1 (time-based) and Version 4 (random).
About UUIDs
UUID (Universally Unique Identifier) is a 128-bit label used for information in computer systems.
Version 4 (Random)
Generated using random or pseudo-random numbers. The probability of duplicates is practically zero.
Version 1 (Time-based)
Generated using a timestamp and the MAC address of the computer (randomized in browser environment).
Version 7 (Sortable)
Time-ordered UUIDs (Unix timestamp) that are sortable. Best for database keys where sorting matters.
FAQ
Are these UUIDs unique?
Yes. The probability of collision for v4 UUIDs is so low (1 in 2.71 quintillion) that it can be ignored for all practical purposes.
Which version should I use?
Use Version 4 for most applications (records, IDs, keys). Use Version 1 if you need time-ordered identifiers (though v7 is better for this, v1 is still common).