Create structurally valid EU VAT numbers for invoicing demos, ERP tests, and signup form fixtures.
Verify European VAT identification numbers against country format rules.
Paste an IBAN and validate it online
Flip a fair virtual coin for heads or tails—useful for quick decisions and tie-breakers.
Roll a fair virtual die with 2 to 1000 sides—d20, d100, or any custom polyhedral count.
Randomize the order of non-empty lines in a pasted list using an in-browser Fisher–Yates shuffle.
Check whether an Italian codice fiscale matches formal checksum and format rules.
Create unique resource addresses
Verify UUID string format and validity for versions 1 through 5.