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A rubric is a grid and this makes the grid. Type the things you are assessing, type the levels you use, and print it with room to write in each cell.
The level names are yours. Schools use working towards and secure, or emerging and mastered, or numbers, and a tool that insists on its own vocabulary is a tool you have to fight before you can use it.
Because they are almost always wrong for your class, and a generic descriptor pasted into a rubric is worse than an empty box you fill in with what you actually mean.
The printed grid leaves the cells open on purpose. Fill them by hand, or type them in before printing if that suits you better.
No. Nothing is stored beyond your own browser and there is nothing to sign up for.
Yes, they are free text. Use whatever your department uses.
Usually, with four criteria and four levels. Reduce the criteria or print landscape if it spills.