The text is rephrased using models fine tuned to minimize the score returned by GPT detectors.
It depends, if the size is too big you will get an error, try to split in smaller parts
Most commonly used languages are supported: English, Italian, Japanese, German, Spanish, Portuguese and more.
Currently there is no pricing but there is a limit of 1000 words per user per month. Later there there will be subscriptions, let me know what is a fair price for you