SARS Testing Tools is a free Chrome extension designed to assist QA testers and developers by generating valid South African tax reference numbers. The tool is capable of producing a variety of reference numbers including SA ID, Income Tax, Company Registration, PAYE, UIF, and SDL, all of which are structured to comply with the relevant validation algorithms such as Luhn and SARS Modulus 10. Users can configure parameters like gender, date of birth range, and company type codes, allowing for tailored test data generation.

The extension features a user-friendly tabbed interface that facilitates quick switching between different number generators. It allows for batch generation of multiple numbers at once and includes a one-click copy function for easy data handling. Importantly, all operations are conducted locally in the browser without any network requests, ensuring user privacy and data security. Designed specifically for those needing realistic testing data, SARS Testing Tools is an invaluable resource for anyone working within South Africa's financial systems.