UUID Generator
Generate random version 4 UUIDs (GUIDs) — one or up to 500 at a time, with format options.
About UUID Generator
This UUID generator online creates random version 4 UUIDs, also called GUIDs, for database keys, API requests, test data and config files. Choose how many you need, from one to 500, and click Generate. Each value is made with your browser's secure random generator.
Format options let you switch to uppercase, remove hyphens or wrap values in braces, matching what your code in Java, Python, JavaScript or .NET expects. Copy all the values at once or download them as a .txt file. It runs in your browser and is free with no sign-up.
How to use UUID Generator
- Choose how many UUIDs you need (1–500).
- Pick uppercase, no hyphens or braces if required.
- Click Generate, then copy all or download a .txt file.
Frequently asked questions
What is a UUID v4?
A 128-bit identifier where 122 bits are random, written as 36 characters like 3f2b8c1e-9d4a-4b7e-8f21-6c5d0a9e7b13. The “4” marks the version.
Can two UUIDs ever clash?
In theory, yes; in practice, no. You would need to generate about a billion UUIDs per second for 85 years to reach a 50% chance of one duplicate.
Is a GUID the same as a UUID?
Yes. GUID is Microsoft's name for the same format; some tools show it in uppercase with curly braces.
How do I generate a UUID v4?
Set the count to 1 and click Generate, then copy the value. Every UUID here is version 4, built from random numbers.
How do I generate many UUIDs at once?
Enter a count of up to 500 and click Generate. Copy the list or download it as a text file, one UUID per line.
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