CUIT/CUIL validator

Validate Argentine CUIT/CUIL with the official AFIP check digit (format XX-XXXXXXXX-X). Free, local, no signup.

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Tool guide

CUIT/CUIL validator: how it works

Practical information to understand the result and use this tool correctly.

About CUIT/CUIL validator

Enter 11 digits with or without dashes. The tool checks the AFIP-style check digit and common person/company prefixes.

Useful before invoices, AFIP forms and payroll when you need a fast format check.

Validation is local — the number is not uploaded.

How to use it

1Paste the CUIT/CUIL.
2Validate.
3Read valid/invalid and normalized format.

Frequently asked questions

How do I validate a CUIT online?: Paste the 11 digits (with or without dashes). The check digit must match the official algorithm.
CUIT vs CUIL?: Same 11-digit structure and check digit; prefixes differ for individuals vs companies.
Is the number uploaded?: No. Validation runs only in your browser.