Short answer: paste the text and press rewrite. The tool swaps inflated vocabulary for plain words, deletes filler openers, unstack hedges, thins em dashes and splits sentences longer than 30 words. It shows which rules fired, and the before/after numbers, so you can judge the result instead of trusting a score.
What a rule-based rewrite can and cannot do
It cannot invent a better sentence. It can remove the parts of a sentence that sound like a machine wrote them — and in most AI text those parts are the vocabulary and the rhythm, not the argument. The argument survives; the padding does not.
That is also the limit: if the text needs a real restructure, this tool will not do it, and a language model would have to. The page is built so that the honest option stays available locally, instead of sending your document to a server for a rewrite.
Read the numbers, not a grade
Machine-written English tends to have uniform sentence lengths and a high rate of a small set of words. Burstiness — the standard deviation of sentence length — is the clearest of those signals: human writing mixes a four-word sentence with a twenty-eight-word one. The tool reports it before and after but promises nothing: splitting one very long sentence can lower the number while making the paragraph read better, and a measurement is not a score.