FillKit

One-click autofill with realistic data. 150+ field types, 50+ locales, valid & invalid modes. For developers, QA, and demos.

FillKit fills web forms with realistic test data in one click. It reads page structure, labels, and field attributes to detect what each input expects — then generates appropriate values automatically. A checkout form gets a valid card number with matching expiry and billing address. A signup form gets a real-looking name, email, and strong password. It recognizes 150+ field types across 50+ locales. Key features: - Valid and invalid modes — generate correct data or intentionally broken values for edge-case testing - Keyboard shortcuts for instant filling (Ctrl+Shift+K fills all forms) - Customizable — override specific fields, set default email domains, choose your locale - Draggable widget or inline per-field filling mode - Works entirely offline — no data leaves your browser Built for developers, QA engineers, and demo environments. All generated data is synthetic. Open source under the MIT license: https://github.com/fillkit/in-browser & it sdk https://github.com/fillkit/sdk