QuillBot — AI writing assistant for paraphrasing and grammar checking

About QuillBot

QuillBot is the most popular AI paraphrasing tool — used by millions of students, academics and professionals to rewrite sentences for clarity, tone or originality. Paste text, choose a mode (Standard, Fluency, Formal, Academic, Simple, Creative and more), and QuillBot rewrites it while preserving meaning, with synonym controls to fine-tune word choices.

Around that core, QuillBot has grown into a full writing suite: a grammar checker, summarizer, AI detector, translator, citation generator and plagiarism checker, plus browser and Word extensions that work wherever you write.

Pricing (as of mid-2026): a capable free tier covers basic paraphrasing (with length limits) and grammar checking. Premium — typically $10–20/month, much less on annual billing — unlocks unlimited paraphrasing, all modes, faster processing and the plagiarism checker.

Strengths: best-in-class paraphrasing quality and control, generous free tier, integrations that meet you inside Google Docs, Word and Chrome. Weaknesses: it refines existing text rather than generating new ideas — pair it with a generative tool like ChatGPT or Claude for drafting from scratch. Academic users should also follow their institution's rules on AI-assisted writing.

Who it's for: students polishing essays, ESL writers improving fluency, professionals tightening emails and reports, and editors reworking drafts.

Frequently Asked Questions

Is QuillBot free?

Yes — free paraphrasing (with sentence limits) and grammar checking. Premium (roughly $10–20/month, cheaper annually) removes limits and unlocks all modes plus plagiarism checking.

Is using QuillBot considered plagiarism?

Paraphrasing someone else's work without citation is plagiarism regardless of the tool. Using QuillBot to improve your own writing is generally fine — but check your school's or employer's AI policy.

What's the difference between QuillBot modes?

Modes change rewriting style: Fluency fixes grammar with minimal change, Formal and Academic elevate tone, Simple makes text easier to read, Creative rewrites more aggressively.

Does QuillBot work in Google Docs and Word?

Yes — extensions for Chrome, Word and macOS let you paraphrase and grammar-check wherever you write.

QuillBot vs Grammarly — which do I need?

Grammarly focuses on correcting what you wrote; QuillBot focuses on rewriting it differently. Many writers use both — QuillBot's free tier plus Grammarly's free tier covers a lot.