The Tax ID Generator is a developer and QA utility that creates randomly generated, mathematically valid identification numbers for software testing. When you build registration forms, payment flows, or databases that accept national tax identifiers, you need realistic sample data to verify that your validation logic and formatting masks work correctly — but using real people's numbers is both unethical and a violation of privacy laws such as the GDPR and Brazil's LGPD. This tool solves that problem by producing numbers with correct check digits that pass format validation yet belong to no real person or company. It supports the main tax identifiers across the languages our site serves: CPF and CNPJ for Brazil, DNI and NIE for Spain, CUIT/CUIL for Argentina, and SSN and EIN for the United States.
How to Use the Tax ID Generator
- Select the document type you need from the dropdown — each option is labelled with its country so you can quickly find CPF, CNPJ, DNI, NIE, CUIT, SSN, or EIN.
- Set how many numbers you want to generate (up to 50 at once) and choose whether to include standard formatting such as dots and dashes, which is useful for testing input masks.
- Click Generate and copy any individual result with its copy button, or use Copy All to grab the entire batch at once for pasting into your test suite or spreadsheet.
Benefits and Use Cases
- Lets developers and QA engineers test forms, APIs, and validation rules with data that passes real check-digit algorithms, catching bugs that random strings would miss.
- Protects privacy and keeps you compliant with data-protection laws by eliminating any need to use real personal tax numbers in development or staging environments.
- Covers multiple countries in a single tool and runs entirely in your browser, so your generated data is never sent to or stored on any server.