All tools
Nineteen checks, grouped by family. All free, all computed in your browser: no value you type here leaves your machine.
Contact
Emails, phone numbers and lists — whatever fills your forms.
Business
Company identifiers and VAT numbers.
Banking
IBAN, BIC and cards — the identifiers that trigger a payment.
Identifiers
Barcodes, IMEI, VIN, ISBN — anything carrying a check digit.
Developer
Formats, test fixtures and everyday encodings.
Specific to French law — available in French only. Queries a public register from your browser.