Checkers
IBAN validator
Check an IBAN checksum and country length. The number never leaves this tab.
Checkers
Validate identifiers in the tab. ISBN book numbers, IBANs, and UK sort codes are validated locally and are not sent anywhere.
Checkers
Sort code checker
Validate UK 6-digit sort code formatting (12-34-56 or 123456) and identify clearing banks locally. Format check only; no live bank verify.
Checkers
ISBN validator
Validate ISBN-10 and ISBN-13 book numbers, verify modulo checksums, identify publisher country/group, and convert between formats in your browser.