Auto Credit Card Filler is a specialized Chrome extension designed for web developers, QA engineers, and designers who often work with payment gateways. This tool streamlines the process of filling out payment forms by securely storing test card information locally. Users can easily autofill credit card details such as numbers, expiration dates, and security codes with a single click, significantly reducing the time spent on repetitive data entry.

Key features include a floating Magic Fill Button that detects payment forms and allows for instant injection of test data, support for multiple cards, and dynamic form mappings tailored for different environments. The extension also incorporates a Stealth Writing Mode to mimic human typing behavior, enhancing its usability in testing scenarios. With deep iframe support, it can handle complex third-party payment systems, ensuring seamless functionality across various platforms.