Check structured files and identifiers before you ship or import data. Validators explain accepted formats and common failure reasons on each page.
Verify European VAT identification numbers against country format rules.
Paste an IBAN and validate it online
Choose the expected country and verify whether the IBAN is structurally valid for that country.
Compute the Luhn mod-10 check digit for a numeric identifier prefix
Build numeric identifiers with a valid Luhn check digit for test cards and identifiers.
Check SVG markup for XML syntax, tag structure, and common vector-graphic mistakes before shipping assets.
Check whether an Italian codice fiscale matches formal checksum and format rules.
Validate credit card and identifier numbers using the Luhn mod-10 algorithm.
Check whether a numeric string passes the ISO 7064 MOD-97 control test.