This advanced random number generator lets you specify various options to tune the random numbers to your liking. The numbers generated are cryptographically strong (see Cryptographically secure numbers
method. The numbers are generated locally in the browser and do not travel across any networks and are not sourced from any single hardware device. On top of using the entropy provided by the window.crypto method (which is small enough to produce cryptographically strong random numbers), it utilizes another algorithm to minimize the entropy per machine even further.