QuillBot

QuillBot is a free AI paraphrasing and writing tool used by over 30 million students, writers, and professionals. Its core function — rewriting text in different styles and tones — is accessible directly in the browser without an account and has made it one of the most-used AI writing tools for academic and content work.

The paraphrasing engine offers seven modes: Standard, Fluency, Formal, Academic, Simple, Creative, and Expand. Each mode reshapes the input text with different goals — Academic tightens and formalizes language for essays, Creative introduces more varied word choices and sentence structures, Simple reduces complexity for plain-language writing. The Chrome extension lets you select any text on any webpage and rewrite it in-place without leaving your browser.

QuillBot Free limits paraphrasing to 125 words per use. QuillBot Premium ($9.95/month or $4.17/month annually) removes the limit, enables all paraphrasing modes, adds a plagiarism checker, and unlocks the summarizer for unlimited document length. The summarizer condenses long articles, papers, and documents into key bullet points in seconds. A known limitation is occasional meaning drift — the tool can subtly change the meaning of a sentence while rewriting it, so human review of output is always recommended.