Generate cryptographically secure UUID v4 values in bulk. Copy them individually or all at once. Nothing leaves your browser.
Generate one or thousands of UUID v4 values in a click, powered by crypto.getRandomValues, the same cryptographic-quality entropy used by operating systems. Each value carries 122 bits of randomness, so the collision probability between any two is astronomically small.
Bulk mode lets you produce up to 10 000 UUIDs at once, ready to copy or download as a plain-text list.
No. Every operation runs inside your browser tab using JavaScript and WebAssembly. Your file is read into memory on your own device, processed there, and the result is offered as a local download. Nothing is transmitted to Sunasty or any third party. You can verify it yourself: open your browser DevTools, go to the Network tab, and watch, no request carries your file.
Yes. Each UUID v4 is built from 122 bits of cryptographic randomness sourced from crypto.getRandomValues, which the browser delegates to the OS CSPRNG. The collision probability for any two generated values is astronomically small (around 1 in 5 × 10³⁶).
Yes, set the count field to any number up to 10 000 and click Generate. The full list can be copied to the clipboard or downloaded as a .txt file, all processed locally.
Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.
It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.