UUID v4 generator
Generate UUID v4 identifiers with cryptographic randomness.
Your files are processed here, on your device
We do not send your file or text contents to a processing server. No account is needed and there is no daily operation quota. Individual tools have size limits to protect your device’s memory.
A connection is needed to load the site and its resources. Hosting may receive technical visit data. Favorites store only tool identifiers in this browser.
How we handle your data →How to use this tool
- Generate a version 4 UUID.
- Copy the complete string with its hyphens.
- Use uniqueness constraints in your application when the identifier must be unique.
An example you can verify
Create a version 4 identifier for test data or technical references.
Example input
Generate a UUID v4.
Expected result
Illustrative format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx.
Actual output is random; y is one of 8,9,a,b. Do not use it as a substitute for authentication.
Settings and limits
Choose 1 to 100 identifiers and generate the list. Each UUID uses version 4 and the browser’s cryptographic random source.
Frequently asked questions
Is a UUID a password?
No. It is an identifier. Collision probability is extremely low, but absolute uniqueness is not guaranteed.