Which free paraphrasing tool is best?

QuillBot is the standard free paraphraser: the free plan rewrites up to 125 words at a time in 2 modes, and Premium removes the limits for $8.33 a month billed annually. Grammarly's paraphrasing tool is free to use without signing up, which suits a sentence or two. For anything longer, the free tier of an AI assistant (ChatGPT, Claude or Gemini) usually does better, as long as you say what you want: 'make this shorter and more formal, keep every fact and number'. LanguageTool's Premium adds unlimited sentence paraphrasing to its grammar checker if you already pay for it. One honest limit: rewording someone else's text still uses their ideas, so it does not make copied work original, and a paraphrase still needs its source named, as Purdue's writing lab puts it. Rule: QuillBot or Grammarly for a sentence, an assistant for a paragraph, and a citation whenever the idea came from someone else.