Free browser-based tools
Small, fast tools that run entirely in your browser. Nothing you type is ever sent to a server. No accounts, no cookies, no tracking.
- Sort: Relevance
- Sort: A–Z
- Sort: Z–A
Dutch BSN Validator
Check any Dutch BSN against the 11-proef checksum, entirely client-side.
EU VAT Number Checker
Validate an EU VAT number's format and checksum before you submit it.
IBAN Validator & Formatter
Validate an IBAN checksum and format it into readable groups.
German Steuer-ID Validator
Check a German Steuer-ID against its digit rule and checksum.
French SIRET Validator
Validate a 14-digit SIRET (and its embedded SIREN) with the Luhn checksum.
Belgian Rijksregisternummer Validator
Check a Belgian national register number against its mod-97 checksum.