The tool at https://demo.imacros.net/PasswordTool.aspx no longer works. I have reverse engineered it and created the following for those that need it.
This can run locally so no need to risk passwords being sent through the internet.
- Download the files into a folder
- Open the "index.html" file in the browser of your choice
- Enter your details in the relevant fields
I hope this helps others who are stuck!